New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Dusel-Bacon, Cynthia (ORCID: 0000-0001-8481-739X)
Originator: Mortensen, James K. (ORCID: 0000-0001-8805-9856)
Publication_Date: 20230808
Title:
New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Suggested Citation: Dusel-Bacon, C., Mortensen, J.K., 2023, New U-Pb geochronology and geochemistry of Paleozoic metaigneous rocks from western Yukon and eastern Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P93ZWGA1
Online_Linkage: https://doi.org/10.5066/P93ZWGA1
Larger_Work_Citation:
Citation_Information:
Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2015
Title:
Tectonic and metallogenic evolution of the eastern Yukon-Tanana upland, Alaska
Geospatial_Data_Presentation_Form: website
Series_Information:
Series_Name: Alaska Science Portal
Issue_Identification: 389
Publication_Information:
Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.
Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=389
Description:
Abstract:
This data release contains three tables of U-Pb zircon isotopic data generated from analyses of 40 metaplutonic and metavolcanic rocks from the Yukon-Tanana Upland of western Yukon and east-central Alaska and one sample from southern Yukon. One of the tables also reports U-Pb data for two titanite analyses for one of the samples. U-Pb zircon ages from analyzed samples range from 363.5 ± 3.8 to 253.1 ± 0.7 Ma and were collected from parautochthonous North America and the allochthonous Yukon-Tanana terrane. U-Pb zircon data include 216 individual analyses by ID-TIMS and 35 individual analyses of two samples by LA-ICP-MS. ID-TIMS analyses of titanite give concordant 206Pb-238U ages of 333 and 338 Ma. Two U-Pb tables report the isotopic composition of uranium (U) and thorium (Pb) measured in each grain, ratios of isotopes of lead and uranium isotopes, and the age of each grain. A third table reports interpreted U-Pb ages, sample locations, tectonic assemblage or unit, lithology, analysis method, laboratory used, and basis for age assignment. The data release also contains two tables of whole-rock major- and trace-element geochemical data for metaigneous rocks from the Yukon-Tanana Upland in east-central Alaska for augen gneiss (15 samples) and amphibolite (30 samples).
Purpose:
The geochronology and geochemistry data in this data release were obtained to assess the genesis of igneous rocks in eastern Alaska and western Yukon to better understand their crystallization ages, tectonic relationships, correlations, environment of formation, and by inference their potential for mineral deposits. The U-Pb zircon and titanite age data set was developed from samples collected during geologic mapping and research conducted from 1989 to 2007 and funded by the U.S. Geological Survey (USGS) Branch of Alaskan Geology and Mineral Resource Program in Alaska, and grants to James K. Mortensen from the Natural Sciences and Engineering Research Council of Canada (NSERC)and University of British Columbia. Our U-Pb zircon data target igneous rocks from a variety of tectonic assemblages that span the Alaska–Yukon border whose origins and relationships have been debated. The whole-rock major and trace element data set of augen gneiss and amphibolite are from samples collected between 1978 and 1996 as part of the Alaska Mineral Resource Assessment program of the USGS. The majority of the geochemical data were previously published in journals (augen gneiss in Dusel-Bacon and Aleinikoff, 1985 GSA Bulletin; amphibolite in Dusel-Bacon and Cooper, 1999 Canadian Journal of Earth Sciences), in addition to some unpublished trace-element data generated at the University of Alaska, Fairbanks. We are including previously published data in the release to provide a complete, machine-readable, publicly available dataset that will be archived in perpetuity. This data release contains complete metadata for each sample, some of which was missing in the journal publications.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1978
Ending_Date: 2007
Currentness_Reference: observed
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -147.93
East_Bounding_Coordinate: -132.45
North_Bounding_Coordinate: 64.92
South_Bounding_Coordinate: 61.49
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC548
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keyword Thesaurus
Theme_Keyword: Age determinations
Theme_Keyword: Geochemistry
Theme_Keyword: Major elements
Theme_Keyword: Minor elements
Theme_Keyword: Igneous rocks
Theme_Keyword: Isotopes
Theme_Keyword: Metamorphic rocks
Theme_Keyword: Radioactive elements
Theme_Keyword: Trace elements
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Geology
Theme_Keyword: Geochronology
Theme_Keyword: Isotopic analysis
Theme_Keyword: Radiometric dating
Theme_Keyword: Uranium-lead analysis
Theme_Keyword: Uranium-thorium analysis
Theme_Keyword: Whole-rock geochemistry
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Big Delta
Place_Keyword: Eagle
Place_Keyword: Fairbanks
Place_Keyword: Tanacross
Place_Keyword: Yukon
Access_Constraints: None
Use_Constraints:
It is requested that the authors, USGS Geology, Minerals, Energy, and Geophysics Science Center, and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Data_Set_Credit:
The University of British Columbia in Vancouver, British Columbia, Canada and the Geology, Minerals, Energy, and Geophysics Science Center in Menlo Park, California are recognized for their unflagging aid and support in enabling the collaboration and coordination of the data collection for this project.
Cross_Reference:
Citation_Information:
Originator: Dusel-Bacon, C.
Originator: Mortensen, J.K.
Publication_Date: Unknown
Title:
New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska, Cross-Border Synthesis, and Implications for Tectonic Models
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: USGS Professional Paper
Issue_Identification: XXXX
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey
Other_Citation_Details:
Dusel-Bacon, C. Mortensen, J.K., in prep, New U-Pb geochronology and geochemistry of Paleozoic metaigneous rocks from western Yukon and eastern Alaska, cross-border synthesis, and implications for tectonic models, USGS Professional Paper XXXX, https://doi.org/10.5066/PXXXXXXX
Online_Linkage: .
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The zircon samples were run with zircon reference materials. The reference materials were analyzed until fractionation was stable and the variance in the measured 206Pb/238U and 207Pb/206Pb ratios was at or near 1 percent. Reference materials were subsequently analyzed together with unknowns to monitor fractionation throughout the analytical session. Instrumental mass fractionation factors for ID-TIMS analyses at the GSC and UBC were determined by replicate analyses of NBS U and Pb standards and the isotopic compositions recommended by Thirlwall, 2000. Pb isotopic analyses were corrected for initial common Pb compositions based on the model of Stacey and Kramers, 1975. Errors associated with calculated ages were determined using the numerical error propagation method of Roddick (1987) and are given at the 2σ level (95% confidence interval).
For XRF trace-element analyses of augen gneiss samples made at the University of Alaska, Fairbanks, matrix corrections were made on standards and unknowns using the Rh Compton peak intensity. Kb interference on Ka intensity (Rb on Y, Sr on Zr, Y on Nb) were corrected by measuring Kb intensity at the respective Ka line (e.g. Rb at Y Ka) for standards and averaging the ratio of Kb:Ka intensity. Twenty-five certified international standards were employed in creating calibration curves.
For whole-rock analyses of amphibolite made at the USGS, analytical precision and accuracy of the spectrophotometric analysis of Nb have been estimated from replicate analyses of eight USGS standard rocks to be 2.9-6.4 % of the amount present (Greenland and Campbell, 1974); precision and accuracy for ICP-AES Nb analysis is comparable. Analytical uncertainties for the other methods, based on replicate analyses of standard rocks (Bacon and Driutt 1988), are reported in Table 1 of Dusel-Bacon and Cooper, 1999. Details about analytical procedures used at USGS are given in Taggart and others (1987).
All Fe reported as Fe2O3 for rocks analyzed by X-ray fluorescence. SIO2 content calculated volatile-free with analysis normalized to total 100.00%.
More detailed information is given in the files included with this data release, Supplemental_Information_Analytical_Methods_U-Pb_Geochronology.pdf and Supplemental_Information_Analytical_Methods_Whole-Rock_Geochemistry.pdf.
Logical_Consistency_Report:
No unexpected values are found in these data. Users should note that the data tables are released in Comma Separated Values format (.csv) which present the data with the correct number of significant figures; however, some software programs may alter the values and truncate trailing zeroes.
Completeness_Report: This data set is complete; no data were omitted.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal position was noted at the time of sample collection on USGS topographic maps with a geodetic reference datum of NAD27. Latitude and longitude values of samples were then converted to geodetic reference datum NAD83, yielding an accuracy of approximately 10 meters.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Dusel-Bacon, C.
Originator: Cooper, K.M.
Publication_Date: 1999
Title:
Trace-Element Geochemistry of Metabasaltic Rocks from the Yukon–Tanana Upland and Implications for the Origin of Tectonic Assemblages in East-Central Alaska
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Canadian Journal of Earth Sciences
Issue_Identification: 36(10):1671-1695
Publication_Information:
Publication_Place: online
Publisher: Canadian Science Publishing
Other_Citation_Details:
Dusel-Bacon, C., Cooper, K.M., 1999, Trace-element geochemistry of metabasaltic rocks from the Yukon–Tanana Upland and implications for the origin of tectonic assemblages in east-central Alaska, Canadian Journal of Earth Sciences, 36(10):1671-1695 doi:10.1139/e99-077
Online_Linkage: https://doi.org/10.1139/e99-077
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Dusel-Bacon and Cooper, 1999
Source_Contribution:
Amphibolite geochemistry and tectonic assemblage data for eastern Alaska
Source_Information:
Source_Citation:
Citation_Information:
Originator: Greenland, L.P.
Originator: Campbell, E.Y.
Publication_Date: 1974
Title: Spectrophotometric determination of niobium in the rocks
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Journal of Research of the United States Geological Survey
Issue_Identification: 2(3):353-355
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Greenland, L.P., and Campbell, E.Y., 1974, Spectrophotometric determination of niobium in the rocks, Journal of Research of the United States Geological Survey, 2(3):353-355
Online_Linkage: https://pubs.usgs.gov/journal/1974/vol2issue3
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1974
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Greenland and Campbell, 1974
Source_Contribution: Outlines procedures for specific elemental detections
Source_Information:
Source_Citation:
Citation_Information:
Originator: Baedecker, P.A.
Originator: McKown, D.M.
Publication_Date: 1987
Title:
Methods of Geochemical Analysis. Chapter H: Instrumental neutron activation analysis of geochemical samples
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: 1770:H1-H14
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Baedecker, P. A., McKown, D.M., 1987, Methods of Geochemical Analysis. Chapter H: Instrumental neutron activation analysis of geochemical samples. U.S. Geological Survey Bulletin 1770:H1-H14
Online_Linkage: https://pubs.usgs.gov/bul/1770/report.pdf
Type_of_Source_Media: publication
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Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Baedecker and McKown, 1987
Source_Contribution:
Outlines procedures for Instrumental Neutron Activation Analysis (INAA) for geochemistry
Source_Information:
Source_Citation:
Citation_Information:
Originator: Taggart Jr., J.E.
Originator: Lindsay, J.R.
Originator: Scott, B.A.
Originator: Vivit, D.V.
Originator: Bartel, A.J.
Originator: Stewart, K.C.
Publication_Date: 1987
Title:
Methods of Geochemical Analysis. Chapter E: Analysis of geologic materials by wavelength-dispersive X-ray fluorescence spectrometry
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: 1770:E1-E19
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Taggart Jr, J.E., Lindsay, J.R., Scott, B.A., Vivit, D.V., Bartel, A.J., Stewart, K.C., 1987, Methods of Geochemical Analysis. Chapter E: Analysis of geologic materials by wavelength-dispersive X-ray fluorescence spectrometry. U.S. Geological Survey Bulletin 1770:E1-E19
Online_Linkage: https://pubs.usgs.gov/bul/1770/report.pdf
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
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Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Taggart et al., 1987
Source_Contribution: Techniques for X-ray fluorescence spectrometry
Source_Information:
Source_Citation:
Citation_Information:
Originator: Johnson, R.G.
Originator: King, B.-S.L.
Publication_Date: 1987
Title:
Methods of Geochemical Analysis. Chapter F: Energy-dispersive X-ray fluorescence spectrometry
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: 1770:F1-F5
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Johnson, R.G., King, B.-S.L., 1987, Methods of Geochemical Analysis. Chapter F: Energy-dispersive X-ray fluorescence spectrometry. U.S. Geological Survey Bulletin 1770:F1-F5
Online_Linkage: https://pubs.usgs.gov/bul/1770/report.pdf
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Johnson and King, 1987
Source_Contribution: Techniques for X-ray fluorescence spectrometry
Source_Information:
Source_Citation:
Citation_Information:
Originator: Lichte, F.E.
Originator: Golightly, D.W.
Originator: Lamothe, P.J.
Publication_Date: 1987
Title:
Methods of Geochemical Analysis. Chapter B: Inductively coupled plasma-atomic emission spectrometry
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: 1770:B1-B10
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Lichte, F.E., Golightly, D.W., Lamothe, P.J., 1987, Methods of Geochemical Analysis. Chapter B: Inductively coupled plasma-atomic emission spectrometry. U.S. Geological Survey Bulletin 1770:B1-B10
Online_Linkage: https://pubs.usgs.gov/bul/1770/report.pdf
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Lichte et al., 1987
Source_Contribution:
Outlines procedures for Inductively Coupled Plasma-Atomic Emission Spectrometry
Source_Information:
Source_Citation:
Citation_Information:
Originator: Golightly, D.W.
Originator: Dorrzaph, A.F., Jr.
Originator: Mays, R.E.
Originator: Fries, T.L.
Originator: Conklin, N.M.
Publication_Date: 1987
Title:
Methods of Geochemical Analysis. Chapter A: Analysis of geologic materials by direct-current arc emission spectrography and spectrometry
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: 1770:A1-A13
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Other_Citation_Details:
Golightly, D.W., Dorrzaph, A.F., Jr., Mays, R.E., Fries, T.L., Conklin, N. M., 1987, Methods of Geochemical Analysis. Chapter A: Analysis of geologic materials by direct-current arc emission spectrography and spectrometry. U.S. Geological Survey Bulletin 1770:A1–A13
Online_Linkage: https://pubs.usgs.gov/bul/1770/report.pdf
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Golightly et al., 1987
Source_Contribution: Specified procedures for geologic materials analyses
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bacon, C.R.
Originator: Druitt, T.H.
Publication_Date: 1988
Title:
Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Contributions to Mineralogy and Petrology
Issue_Identification: 98:224-256
Publication_Information:
Publication_Place: online
Publisher: Springer
Other_Citation_Details:
Bacon, C.R., Druitt, T.H., 1988, Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon. Contributions to Mineralogy and Petrology 98:224–256 doi:10.1007/BF00402114
Online_Linkage: https://doi.org/10.1007/BF00402114
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1988
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Bacon and Druitt, 1988
Source_Contribution: Whole rock composition geochemistry
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stacey, J.S.
Originator: Kramers, J.D.
Publication_Date: 1975
Title:
Approximation of terrestrial lead isotope evolution by a two-stage model
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Earth and Planetary Science Letters
Issue_Identification: 26(2):207-221
Publication_Information:
Publication_Place: online
Publisher: Elsevier BV
Other_Citation_Details:
Stacey, J.S., Kramers, J.D., 1975, Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Science Letters 26(2):207-221 doi:10.1016/0012-821X(75)90088-6
Online_Linkage: https://doi.org/10.1016/0012-821X(75)90088-6
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Stacey and Kramers, 1975
Source_Contribution:
Lead and thorium isotope information for use in model age determinations.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Krogh, T.E.
Publication_Date: 1982
Title:
Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Geochimica et Cosmochimica Acta
Issue_Identification: 46(4):637-649
Publication_Information:
Publication_Place: online
Publisher: Elsevier
Other_Citation_Details:
Krogh, T.E., 1982, Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique: Geochimica et Cosmochimica Acta 46(4):637–649 doi:10.1016/0016-7037(82)90165-X
Online_Linkage: https://doi.org/10.1016/0016-7037(82)90165-X
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1982
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Krogh, 1982
Source_Contribution: Concordance accuracy improvement techniques
Source_Information:
Source_Citation:
Citation_Information:
Originator: Mortensen, J.K.
Originator: Hall, B.V.
Originator: Bissig, T.
Originator: Friedman, R.M.
Originator: Danielson, T.
Originator: Oliver, J.
Originator: Rhys, D.A.
Originator: Ross, K.V.
Originator: Gabites, J.E.
Publication_Date: 2008
Title:
Age and paleotectonic setting of volcanogenic massive sulfide deposits in the Guerrero Terrane of central Mexico: constraints from U-Pb age and Pb isotope studies
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Economic Geology
Issue_Identification: 103(1):117-140
Publication_Information:
Publication_Place: online
Publisher: Society of Economic Geologists
Other_Citation_Details:
Mortensen, J.K., Hall, B.V., Bissig, T., Friedman, R.M., Danielson, T., Oliver, J., Rhys, D.A., Ross, K.V., Gabites, J.E., 2008. Age and paleotectonic setting of volcanogenic massive sulfide deposits in the Guerrero Terrane of central Mexico: constraints from U-Pb age and Pb isotope studies: Economic Geology 103(1):117-140 doi:10.2113/gsecongeo.103.1.117
Online_Linkage: https://doi.org/10.2113/gsecongeo.103.1.117
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2008
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Mortensen et al., 2008
Source_Contribution: U-Pb age dating techniques involving volcanic deposits
Source_Information:
Source_Citation:
Citation_Information:
Originator: Thirlwall, M.F.
Publication_Date: 2000
Title:
Inter-laboratory and other errors in Pb isotope analyses investigated using a 207Pb–204Pb double spike
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Chemical Geology
Issue_Identification: 163(1-4):299-322
Publication_Information:
Publication_Place: online
Publisher: Elsevier
Other_Citation_Details:
Thirlwall, M.F., 2000. Inter-laboratory and other errors in Pb isotope analyses investigated using a 207Pb–204Pb double spike. Chemical Geology 163(1-4):299-322 doi:10.1016/S0009-2541(99)00135-7
Online_Linkage: https://doi.org/10.1016/S0009-2541(99)00135-7
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Thirlwall, 2000
Source_Contribution: Error correction techniques for lead isotope analyses
Source_Information:
Source_Citation:
Citation_Information:
Originator: Roddick, J.C.
Publication_Date: 1987
Title:
Generalized numerical error analysis with application to geochronology and thermodynamics
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Geochimica et Cosmochimica Acta
Issue_Identification: 51(8):2129–2135
Publication_Information:
Publication_Place: online
Publisher: Elsevier BV
Other_Citation_Details:
Roddick, J.C., 1987, Generalized numerical error analysis with application to geochronology and thermodynamics: Geochimica et Cosmochimica Acta 51(8):2129–2135 doi:10.1016/0016-7037(87)90261-4
Online_Linkage: https://doi.org/10.1016/0016-7037(87)90261-4
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Roddick, 1987
Source_Contribution: Error correction techniques in lead isotope geochronology
Source_Information:
Source_Citation:
Citation_Information:
Originator: Tafti, R.
Originator: Mortensen, J.K.
Originator: Lang, J.R.
Originator: Rebagliati, M.
Originator: Oliver, J.L.
Publication_Date: 2009
Title:
Jurassic U-Pb and Re-Os ages for the newly discovered Xietongmen Cu-Au porphyry district, Tibet, P.R.C.: Implications for metallogenic epochs in the southern Gangdese Belt
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: Economic Geology
Issue_Identification: 104(1):127-136
Publication_Information:
Publication_Place: online
Publisher: Society of Economic Geologists
Other_Citation_Details:
Tafti, R., Mortensen, J.K., Lang, J.R., Rebagliati, M., and Oliver, J.L., 2009, Jurassic U-Pb and Re-Os ages for the newly discovered Xietongmen Cu-Au porphyry district, Tibet, P.R.C.: Implications for metallogenic epochs in the southern Gangdese Belt. Economic Geology 104(1):127-136 doi:10.2113/gsecongeo.104.1.127
Online_Linkage: https://doi.org/10.2113/gsecongeo.104.1.127
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2009
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Tafti et al., 2009
Source_Contribution:
Geochronology techniques and descriptions as reported from the University of British Columbia
Source_Information:
Source_Citation:
Citation_Information:
Originator: Mortensen, J.K.
Originator: Ghosh, D.K.
Originator: Ferri, F.
Publication_Date: 1995
Title:
U-Pb geochronology of intrusive rocks associated with copper-gold porphyry deposits in the Canadian Cordillera
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name:
Canadian Institute of Mining, Metallurgy and Petroleum Special Volume
Issue_Identification: 46:142-158
Publication_Information:
Publication_Place: Montreal, Canada
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum
Other_Citation_Details:
Mortensen, J.K., Ghosh, D.K., Ferri, F., 1995, U-Pb geochronology of intrusive rocks associated with copper-gold porphyry deposits in the Canadian Cordillera. in Schroeter, T.G. (ed.) Porphyry Deposits of the Northwestern Cordillera of North America. Canadian Institute of Mining, Metallurgy and Petroleum Special Volume 46:142–158
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Mortensen et al., 1995
Source_Contribution:
Specific geochronology techniques and considerations for intrusive lithologies
Source_Information:
Source_Citation:
Citation_Information:
Originator: Parrish, R.R.
Originator: Bellerive, D.
Originator: Sullivan, R.W.
Publication_Date: 1992
Title:
U-Pb chemical procedures for titanite and allanite in the Geochronology Laboratory, Geological Survey of Canada
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: Geological Survey of Canada
Issue_Identification: Paper 91-2:187-190
Publication_Information:
Publication_Place: online
Publisher: Natural Resources Canada/CMSS/Information Management
Other_Citation_Details:
Parrish, R.R., Bellerive, D., Sullivan, R.W., 1992, U-Pb chemical procedures for titanite and allanite in the Geochronology Laboratory, Geological Survey of Canada. Radiogenic Age and Isotopic Studies, Report 5: Geological Survey of Canada, Paper 91-2:187-190 doi:/10.4095/132925
Online_Linkage: https://doi.org/10.4095/132925
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Parrish et al., 1992
Source_Contribution: Uranium, lead, and titanite analysis laboratory procedures
Source_Information:
Source_Citation:
Citation_Information:
Originator: Parrish, R.R.
Originator: Roddick, J.C.
Originator: Loveridge, W.D.
Originator: Sullivan, R.W.
Publication_Date: 1987
Title:
Uranium-lead analytical techniques at the Geochronology Laboratory, Geological Survey of Canada
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: Geological Survey of Canada
Issue_Identification: Paper 87-2:3-7
Publication_Information:
Publication_Place: online
Publisher: Natural Resources Canada/CMSS/Information Management
Other_Citation_Details:
Parrish, R.R., Roddick, J.C., Loveridge, W.D., Sullivan, R.W., 1987, Uranium-lead analytical techniques at the Geochronology Laboratory, Geological Survey of Canada. Radiogenic age and isotopic studies, Report 1: Geological Survey of Canada, Paper 87-2:3-7 doi:10.4095/122739
Online_Linkage: https://doi.org/10.4095/122739
Type_of_Source_Media: Digital and/or Hardcopy
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Parrish et al., 1987
Source_Contribution: Geochronology laboratory techniques
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ludwig, K.R.
Publication_Date: 2003
Title:
User's Manual for Isoplot 3.00 : A Geochronological Toolkit for Microsoft Excel
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Berkeley Geochronology Center Special Publications
Issue_Identification: Special Publication no. 4
Publication_Information:
Publication_Place: online
Publisher: Berkeley Geochronology Center
Other_Citation_Details:
Ludwig, K.R. 2003. User's Manual for Isoplot 3.00 : A Geochronological Toolkit for Microsoft Excel, Berkeley Geochronology Center, Special Publication no. 4
Online_Linkage: https://www.bgc.org/isoplot
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2003
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Ludwig, 2003
Source_Contribution: Software instructions for digital geochronological tools
Process_Step:
Process_Description:
For USGS analysis of augen gneiss whole-rock samples: All elemental abundances in weight percent were determined by wavelength-dispersive X-ray fluorescence spectrometry (A. Bartel, J. Carr, V. McDaniel, K. Stewart, and J. Taggart, analysts; USGS, Denver, Colorado) (Taggart et al., 1987). All elemental abundances in parts per million (ppm) were determined by instrumental neutron activation analysis (J. Mee, and I. Schwartz, analysts, USGS Reston, Virginia) (Baedecker and McKown, 1987), except for niobium that was determined by spectrophotometric analysis (E. Campbell and M. Doughton, analysts; USGS, Denver Colorado) (Greenland and Campbell, 1974).
Process_Date: 1983
Process_Step:
Process_Description:
For analysis of amphibolite whole-rock samples: USGS-analyzed samples were ground in an alumina shatterbox. Major elements were determined by wavelength-dispersive X-ray fluorescence spectrometry (XRF) on fused glass disks in Lakewood, Colorado (J. Baker, A.J. Bartel, V. McDaniel, K. Stewart, J. Taggart, and J.S. Wahlberg analysts) (Taggart et al., 1987). Ba, Rb, Sr, Y, and Zr were determined by energy-dispersive X-ray fluorescence spectrometry XRF in Menlo Park, California (P.E. Bruggman analyst) (Johnson and King, 1987). Emission spectroscopy was used for Cu, Ni, V (Menlo Park; T. Fries, P. Lamothe, and R.W. Lerner, analysts) (Golightly et al., 1987). For all samples except 91ADb15, 91ADb 12, and 91ADb 14A, Nb was determined by spectrophotometric in Reston, Virginia, (E. Campbell, M. Doughten, and B. Libby analysts) (Greenland and Campbell, 1974). Niobium for samples 91ADb15, 91ADb12, and 91ADb14A was analyzed by inductively coupled plasma-atomic emission spectrometry (ICP-AES) following quantitative chemical separation (Menlo Park, S.J. Pribble analyst) (Lichte et al., 1987). The remaining elements (Co, Cr, Cs, Hf, Ta, Th, U, Zn, Sc, La, Ce, Nd, Sm, Eu, Tb, Yb, and Lu) were analyzed by instrumental neutron-activation analysis (INAA) in Reston, Virginia (J. Grossman, J.S. Mee, L.J. Schwarz, and G.A. Wandless analysts) (Baedecker and McKown, 1987). For analysis of three amphibolite whole-rock samples by Chemex laboratory, Vancouver, Canada: Major elements (and Cr2O3) were determined by wavelength-dispersive X-ray fluorescence spectrometry (XRF) analysis of pellets made by meta-borate fusion of powder ground in a tungsten carbide ring mill; lower detection limits are 0.01 %. Trace elements for these samples were determined by inductively coupled plasma mass spectrometry (ICP-MS) analysis of powders ground in a chrome steel ring mill that were subjected to meta-borate fusion followed by dissolution. Ni was determined by atomic absorption following a Nitric aqua regia leach.
Process_Date: 1998
Process_Step:
Process_Description:
For analysis of augen gneiss samples at University of Alaska Fairbanks: Approximately 10 gram alliquots of previously pulverized and homogenized sample material was made into 40 cm pressed pellets, using 1 drop of 5% polyvinyl alcohol solution per 2 grams of sample, and compressed to 10 tons for 2 minutes. Once dried, samples were analyzed with a PanAlytical Axios X-ray Fluorescence Spectrometer.
Process_Date: 1996
Process_Step:
Process_Description:
For U-Pb analysis of zircons: Most analyses were done on multi-grain fractions of zircon, which had had the outer portions of the grains removed by strong air abrasion in order to minimize the effects of post-crystallization Pb-loss. Analyses made prior to 1992 were carried out at the Geochronological Laboratory at the Geological Survey of Canada in Ottawa, Canada, using conventional isotope dilution–thermal ionization mass spectrometry ID-TIMS methods for zircon and titanite analyses, respectively. Isotopic analyses were done on a Finnigan-MAT 261 variable multicollector mass spectrometer. Most U-Pb zircon analyses done after 1992 were carried out at the Pacific Centre for Isotopic and Geochemical Research at the University of British Columbia (UBC) in Vancouver, Canada. Analyses were by conventional ID-TIMS methods employing a VG 54R single collector mass spectrometer equipped with a Daly multiplier, and methods as described by Mortensen et al., (1995, 2008). Several U-Pb zircon samples were dated at UBC using laser-ablation-inductively-coupled-mass spectrometry (LA-ICP-MS) employing methods as described by Tafti et al., 2009. These analyses were done using a New Wave 213nm Nd-YAG laser coupled to a Thermo Finnigan Element2 high resolution ICP-MS.
More detailed information is given in the files included with this data release, Supplemental_Information_Analytical_Methods_U-Pb_Geochronology.pdf and Supplemental_Information_Analytical_Methods_Whole-Rock_Geochemistry.pdf.
Process_Date: 2009
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (NAD 83)
Ellipsoid_Name: Geodetic Reference System 1980 (GRS 80)
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
zircon_titanite_geochemical_dataDictionary_westernYK_easternAK.csv
Entity_Type_Definition:
Table describing all fields in the five data tables included in this data package. Includes field names, a brief description of each field, and units of measure, as applicable. The table contains 150 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Table
Attribute_Definition: Filename of the data table the field is found in.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: zircon_sample_summary_westernYK_easternAK
Enumerated_Domain_Value_Definition:
Table with 40 records included with this data package containing sample information type and descriptions of collection localities.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: zircon_titanite_TIMS_data_westernYK_easternAK
Enumerated_Domain_Value_Definition:
Table with 213 records included with this data package, containing detrital zircon analyses results.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: zircon_LA_ICPMS_data_westernYK_easternAK
Enumerated_Domain_Value_Definition:
Table with 35 records included with this data package containing Laser Ablation Inductively Coupled Plasma Mass Spectrometry results.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: augen_gneiss_chemistry_data_westernYK_easternAK
Enumerated_Domain_Value_Definition:
Table with 15 records included with this data package containing specific sample information, geochemistry concentrations, and descriptions of collection localities.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: amphibolite_chemistry_data_westernYK_easternAK
Enumerated_Domain_Value_Definition:
Table with 30 records included with this data package containing specific sample information, geochemistry concentrations, and descriptions of collection localities.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Field
Attribute_Definition:
Field name found in data tables included in this data package (single words or concatenated abbreviations that describe the contents of the field).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Name of each field in the CSV data tables.
Attribute:
Attribute_Label: Definition
Attribute_Definition: Brief description of the contents of 'Field'.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Brief description of the contents of 'Field'.
Attribute:
Attribute_Label: Units
Attribute_Definition: The unit of measurement for applicable data fields.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: n/a
Enumerated_Domain_Value_Definition: n/a = not applicable
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: degrees
Enumerated_Domain_Value_Definition:
degrees = angular unit of measure, expressed as a decimal number
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ga
Enumerated_Domain_Value_Definition: Ga = Giga-annum, or billions of years before present
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: m
Enumerated_Domain_Value_Definition: m = meters
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ma
Enumerated_Domain_Value_Definition: Ma = Mega-annum, or millions of years before present
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mg
Enumerated_Domain_Value_Definition: mg = milligrams, or 1/1,000 gram
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ng
Enumerated_Domain_Value_Definition: ng = nanogram, or 1/1,000,000,000 of a gram
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ppm
Enumerated_Domain_Value_Definition: ppm = parts per million
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: %
Enumerated_Domain_Value_Definition: % = percent
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: wt_%
Enumerated_Domain_Value_Definition: wt_% = weight percent
Enumerated_Domain_Value_Definition_Source: Author defined
Detailed_Description:
Entity_Type:
Entity_Type_Label: zircon_sample_summary_westernYK_easternAK.csv
Entity_Type_Definition:
Table with sample information, including location, lithologic description, and summary of geochronology analyses. The table contains 40 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier usually consisting of the last two digits of the year collected, abbreviation identifying the collector, with a one to three-digit number and possible one to two-letter suffix, some entries are separated within by one or more hyphens. Corresponds to the 'Sample' field in the other tables included with this data package.
Attribute:
Attribute_Label: Interpreted_UPb_age_Ma
Attribute_Definition:
Calculated interpreted U-Pb age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 253.1
Range_Domain_Maximum: 363.5
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: Interpreted_UPb_age_Unc_Ma
Attribute_Definition:
Calculated interpreted U-Pb age uncertainty, in millions of years before present. A blank cell is present, indicating no uncertainty calculation was available for that analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.3
Range_Domain_Maximum: 3.8
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: Interpreted_UPb_age_mod
Attribute_Definition:
Supplemental information for specific sample analyses. Blank cells are present, indicating no supplemental analysis information was recorded.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field are "single", indicating a single concordant analysis was used for age determination, and "approximate", where the uncertainty of determination was not available.
Attribute:
Attribute_Label: Latitude
Attribute_Definition:
Latitude of sample field location in degrees north using NAD83 datum.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 61.500
Range_Domain_Maximum: 64.617
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: Longitude
Attribute_Definition:
Longitude of sample field location in degrees west using NAD83 datum.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -141.838
Range_Domain_Maximum: -132.460
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: UTM_Zone
Attribute_Definition: Zone of Universal Transverse Mercator of sample location.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Values in this dataset include "7V", "7W", and "8A".
Attribute:
Attribute_Label: UTM_N
Attribute_Definition:
Northern coordinate of Universal Transverse Mercator of sample location.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 6821112
Range_Domain_Maximum: 7165846
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: UTM_E
Attribute_Definition:
Eastern coordinate of Universal Transverse Mercator of sample location.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 459111
Range_Domain_Maximum: 635180
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Map_sheet_Quadrangle
Attribute_Definition:
Name of map sheet in Canada or quadrangle in Alaska where sample located. Individual 1:50,000-scale or 1:63,360-scale designation follows map sheet or quadrangle name, respectively.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field include formal quadrangle names as shown on United States Geological Survey and Geological Survey of Canada topographic maps, followed by a specific alphanumeric map designation for the area.
Attribute:
Attribute_Label: State_Territory
Attribute_Definition:
Name of State in the US and Territory in Canada where sample located.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Values in this dataset are "Alaska" or "Yukon".
Attribute:
Attribute_Label: Tectonic_assemblage_unit
Attribute_Definition:
Lithotectonic assemblages name or unit in the case of Ladue River from which sample collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field include formal or informal names as shown on United States Geological Survey and Geological Survey of Canada topographic maps; this is a free text field.
Attribute:
Attribute_Label: Lithology
Attribute_Definition:
Rock type from which zircon was separated; some entries contain name of pluton or other supporting information as relevant.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field include lithologic designators of samples collected and may include the name associated with a pluton or other supplemental information, as applicable; this is a free text field.
Attribute:
Attribute_Label: Analysis_method
Attribute_Definition: Laboratory equipment and methodology used to collect data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ID-TIMS U-Pb
Enumerated_Domain_Value_Definition:
ID-TIMS = Isotope Dilution Thermal Ionization Mass Spectrometry uranium lead analysis
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-ICP-MS U-Pb
Enumerated_Domain_Value_Definition:
LA-ICPMS = Laser Ablation Inductively Coupled Plasma Mass Spectrometry uranium lead analysis
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Laboratory_used
Attribute_Definition: Laboratory where data were collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GSC
Enumerated_Domain_Value_Definition:
GSC = Geochronology Laboratory, Geological Survey of Canada, Ottawa, Canada
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: UBC
Enumerated_Domain_Value_Definition:
UBC = Pacific Centre for Isotopic and Geochemical Research at the University of British Columbia, Vancouver, Canada
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GSC, UBC
Enumerated_Domain_Value_Definition:
GSC, UBC = Geochronology Laboratory, Geological Survey of Canada, Ottawa, Canada, Pacific Centre for Isotopic and Geochemical Research at the University of British Columbia, Vancouver, Canada
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: UPb_age_method
Attribute_Definition:
Method used to determine the assigned age in the UPb_Age_Ma field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this dataset include various types of weighted average or minimum age calculations and analysis designators this is a free text field.
Attribute:
Attribute_Label: UPb_inheritance_age
Attribute_Definition:
U-Pb zircon ages older than the interpreted crystallization age of the sample; in billions of years. Multiple values are present in some cells. Blank cells are present when inheritance age was not determined.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.44
Range_Domain_Maximum: 3.91
Attribute_Units_of_Measure: Giga-annum (Ga), or billions of years before present
Detailed_Description:
Entity_Type:
Entity_Type_Label: zircon_titanite_TIMS_data_westernYK_easternAK.csv
Entity_Type_Definition:
Table with sample isotope information, including concentration and ratio measurements, and results of geochronology analyses. The table contains 213 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Sample identifier usually consisting of the last two digits of the year collected, abbreviation identifying the collector, with a one to three-digit number and possible one to two-letter suffix. Corresponds to the 'Sample' field in the other tables included with this data package.
Attribute:
Attribute_Label: Mineral_analyzed
Attribute_Definition: Type of mineral used in analyses.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: zircon
Enumerated_Domain_Value_Definition: Data are from analyses for zircon.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: titanite
Enumerated_Domain_Value_Definition: Data are from analyses for titanite.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Analysis_description
Attribute_Definition:
Sample analyses information and comments as noted by the laboratory.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this dataset include U-Pb zircon sequences, as designated by the letters A-H, followed by a ": " and the "N1", "N2" = non-magnetic and +n or -n degrees side slope value or range on the Frantz magnetic separator; grain size given in microns. Titanite ("T1" and "T2" only) analysis is indicated as applicable. This is a free text field.
Attribute:
Attribute_Label: Analysis_description_mod
Attribute_Definition:
Sample analysis modifying information for grain or grains analyzed. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: blank cells
Enumerated_Domain_Value_Definition: blank cells indicate no modifying information of note
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: published
Enumerated_Domain_Value_Definition:
published = some information for the noted sample was previously published by Mortensen (1986)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: single
Enumerated_Domain_Value_Definition: single = only a single grain was analyzed in the noted sample
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Analysis_description_grain
Attribute_Definition:
Sample analysis comments noted by laboratory regarding grain condition. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: abraded
Enumerated_Domain_Value_Definition: abraded = noted grain surface condition
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: unabraded
Enumerated_Domain_Value_Definition: unabraded = noted grain surface condition
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: elongate broken inherited
Enumerated_Domain_Value_Definition:
elongate broken inherited = noted grain shape with tips of elongate prisms with inherited cores
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: elongated prismatic
Enumerated_Domain_Value_Definition: elongated prismatic = noted grain shape
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: stubby prismatic
Enumerated_Domain_Value_Definition: stubby prismatic = noted grain shape
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Wt_mg
Attribute_Definition: Weight of sample analyzed, in milligrams.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.003
Range_Domain_Maximum: 21.700
Attribute_Units_of_Measure: milligrams (mg)
Attribute:
Attribute_Label: U_ppm
Attribute_Definition: Concentration of uranium (U), in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 25.00
Range_Domain_Maximum: 2067.00
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Pb_ppm
Attribute_Definition:
Concentration of radiogenic lead (Pb) in parts per million, corrected for blanks, initial common Pb, and spike.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.70
Range_Domain_Maximum: 107.00
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: 206Pb_204Pb_measured
Attribute_Definition:
Ratio of 206Pb to 204Pb corrected for spike and fractionation, as determined from replicate analyses of NBS common Pb standards.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 81
Range_Domain_Maximum: 55840
Attribute:
Attribute_Label: Total_common_Pb_ng
Attribute_Definition: Total common lead (Pb) contained in the sample, in nanograms.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.001
Range_Domain_Maximum: 10.480
Attribute_Units_of_Measure: nanograms (ng)
Attribute:
Attribute_Label: Perc_208Pb
Attribute_Definition:
Percent 208Pb corrected for spike and fractionation, as determined from replicate analyses of NBS common Pb standards.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.4
Range_Domain_Maximum: 39.9
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 207Pb_235U_ratio
Attribute_Definition:
Ratio of 207Pb to 235U corrected for blank Pb and U, and initial common Pb (from Stacey and Kramers, 1975).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.05616
Range_Domain_Maximum: 2.22580
Attribute:
Attribute_Label: 207Pb_235U_ratio_Unc_1Std
Attribute_Definition:
Uncertainty associated with isotopic ratios were determined using the numerical error propagation method of Roddick, 1987. Ratio has an uncertainty of one standard deviation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.09
Range_Domain_Maximum: 3.38
Attribute:
Attribute_Label: 206Pb_238U_ratio
Attribute_Definition:
Ratio of 206Pb to 238U corrected for blank Pb and U, and initial common Pb (from Stacey and Kramers, 1975).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02950
Range_Domain_Maximum: 0.42300
Attribute:
Attribute_Label: 206Pb_238U_ratio_Unc_1Std
Attribute_Definition:
Uncertainty associated with isotopic ratios were determined using the numerical error propagation method of Roddick, 1987. Ratio has an uncertainty of one standard deviation
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.08
Range_Domain_Maximum: 1.10
Attribute:
Attribute_Label: Correlation_coefficient
Attribute_Definition:
Correlation between calculated 206Pb/238U and 207Pb/235U ratios.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.30
Range_Domain_Maximum: 0.98
Attribute:
Attribute_Label: 207Pb_206Pb_ratio
Attribute_Definition:
Ratio of 207Pb to 206Pb corrected for blank Pb and U, and initial common Pb (from Stacey and Kramers, 1975).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01108
Range_Domain_Maximum: 0.13139
Attribute:
Attribute_Label: 207Pb_206Pb_Unc_1Std
Attribute_Definition:
Uncertainty associated with isotopic ratios were determined using the numerical error propagation method of Roddick, 1987. Ratio has an uncertainty of one standard deviation, given in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 2.96
Attribute:
Attribute_Label: 206Pb_238U_age
Attribute_Definition: 206Pb/238U age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 187.40
Range_Domain_Maximum: 964.60
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_age_Unc_2sig
Attribute_Definition:
Uncertainty in 206Pb/238U age, in millions of years before present at 95% confidence interval (2sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 7.50
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_235U_age
Attribute_Definition: 207Pb/235U age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 214.30
Range_Domain_Maximum: 1189.00
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_235U_age_Unc_2sig
Attribute_Definition:
Uncertainty in 207Pb/235U age, in millions of years before present at 95% confidence interval (2sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.50
Range_Domain_Maximum: 14.70
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_age
Attribute_Definition: 207Pb/206Pb age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 245.8
Range_Domain_Maximum: 2116.0
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_age_Unc_2sig
Attribute_Definition:
Uncertainty in 207Pb/206Pb age, in millions of years before present at 95% confidence interval (2sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.5
Range_Domain_Maximum: 135.0
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Detailed_Description:
Entity_Type:
Entity_Type_Label: zircon_LA_ICPMS_data_westernYK_easternAK.csv
Entity_Type_Definition:
Table with sample isotope information, including age determinations and ratio measurements as the result of geochronology analyses. The table contains 35 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier usually consisting of the last two digits of the year collected, a hyphen, an abbreviation identifying the collector, a hyphen, and a two or three-digit number and possible one letter suffix. Corresponds to the 'Sample' field in the other tables included with this data package.
Attribute:
Attribute_Label: Analysis_number
Attribute_Definition:
Analysis sequence number for a single-line scan analysis on a single grain.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 20
Attribute:
Attribute_Label: 207Pb_206Pb_ratio
Attribute_Definition: Ratio of 207Pb to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.04898
Range_Domain_Maximum: 0.05970
Attribute:
Attribute_Label: 207Pb_206Pb_ratio_Unc_1Std
Attribute_Definition: Uncertainty (1 standard deviation) of ratio of 207Pb to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00072
Range_Domain_Maximum: 0.00254
Attribute:
Attribute_Label: 207Pb_235U_ratio
Attribute_Definition: Ratio of 207Pb to 235U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.27249
Range_Domain_Maximum: 0.45356
Attribute:
Attribute_Label: 207Pb_235U_ratio_Unc_1Std
Attribute_Definition: Uncertainty (1 standard deviation) of ratio of 207Pb to 235U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00415
Range_Domain_Maximum: 0.02112
Attribute:
Attribute_Label: 206Pb_238U_ratio
Attribute_Definition: Ratio of 206Pb to 238U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03958
Range_Domain_Maximum: 0.05406
Attribute:
Attribute_Label: 206Pb_238U_ratio_Unc_1Std
Attribute_Definition: Uncertainty (1 standard deviation) of ratio of 206Pb to 238U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00021
Range_Domain_Maximum: 0.00090
Attribute:
Attribute_Label: Rho
Attribute_Definition: Correlation between calculated 206Pb/238U and 207Pb/235U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.30
Range_Domain_Maximum: 0.37
Attribute:
Attribute_Label: 207Pb_206Pb_age
Attribute_Definition: 207Pb/206Pb age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 146.9
Range_Domain_Maximum: 593.3
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_age_Unc_1sig
Attribute_Definition:
Uncertainty in 207Pb/206Pb age, in millions of years before present at 68% confidence interval (1sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 30.6
Range_Domain_Maximum: 100.1
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_235U_age
Attribute_Definition: 207Pb/235U age, in millions of years before present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 244.7
Range_Domain_Maximum: 379.8
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 207Pb_235U_age_Unc_1sig
Attribute_Definition:
Uncertainty in 207Pb/235U age, in millions of years before present at 68% confidence interval (1sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.3
Range_Domain_Maximum: 15.4
Attribute_Units_of_Measure: Mega-annum (Ma), or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_age
Attribute_Definition:
206Pb/238U age, in millions of years before present. Crystallization ages for each sample are assigned based on a weighted average of the 206Pb/238U ages of multiple analyses
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 250.3
Range_Domain_Maximum: 339.4
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_age_Unc_1sig
Attribute_Definition:
Uncertainty in 206Pb/238U age, in millions of years before present at 68% confidence interval (1sigma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.3
Range_Domain_Maximum: 5.5
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Detailed_Description:
Entity_Type:
Entity_Type_Label: augen_gneiss_chemistry_westernYK_easternAK.csv
Entity_Type_Definition:
Table with sample information, including location information, concentration amounts, and results of varied geochemistry analyses. The table contains 15 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier usually consisting of the last two digits of the year collected, abbreviation identifying the collector, with a one to three-digit number and possible one to two-letter suffix. Corresponds to the 'Sample' field in the other tables included with this data package.
Attribute:
Attribute_Label: Latitude
Attribute_Definition: Latitude of sample collected, in datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 63.3590
Range_Domain_Maximum: 64.3640
Attribute_Units_of_Measure: Decimal degrees (NAD83)
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Longitude
Attribute_Definition: Longitude of sample collected, in datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -141.0259
Range_Domain_Maximum: -144.7206
Attribute_Units_of_Measure: Decimal degrees (NAD83)
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Quad_250K
Attribute_Definition:
Name of 1:250,000-scale topographic map quadrangle in Alaska in which sample was collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: BD
Enumerated_Domain_Value_Definition: BD = Big Delta Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: EA
Enumerated_Domain_Value_Definition: EA = Eagle Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: TC
Enumerated_Domain_Value_Definition: TC = Tanacross Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Quad_63K
Attribute_Definition:
Name of 1:63,360-scale topographic map quadrangle in Alaska in which sample was collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values included in this field are the letters "A", "B", "C", or "D" followed by a hyphen and a single digit number.
Attribute:
Attribute_Label: SiO2_wt_perc
Attribute_Definition:
Silica concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 70.0
Range_Domain_Maximum: 74.4
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Al2O3_wt_perc
Attribute_Definition:
Alumina concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 13.0
Range_Domain_Maximum: 14.5
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Fe2O3_wt_perc
Attribute_Definition:
Ferric iron oxide concentration, as determined by wavelength dispersive X-ray fluorescence. All iron reported as Fe2O3.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.15
Range_Domain_Maximum: 4.42
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MgO_wt_perc
Attribute_Definition:
Magnesium oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 1.2
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: CaO_wt_perc
Attribute_Definition:
Calcium oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.99
Range_Domain_Maximum: 2.29
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Na2O_wt_perc
Attribute_Definition:
Sodium oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.17
Range_Domain_Maximum: 3.40
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: K2O_wt_perc
Attribute_Definition:
Potassium oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.83
Range_Domain_Maximum: 5.56
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: TiO2_wt_perc
Attribute_Definition:
Titanium oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.21
Range_Domain_Maximum: 0.66
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: P2O5_wt_perc
Attribute_Definition:
Phosphorus pentoxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.12
Range_Domain_Maximum: 0.26
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MnO_wt_perc
Attribute_Definition:
Manganese oxide concentration, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 0.06
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: LOI_wt_perc
Attribute_Definition:
Loss on ignition, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.10
Range_Domain_Maximum: 1.50
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Total_wt_perc
Attribute_Definition:
Total weight percent of oxides, as determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 98.99
Range_Domain_Maximum: 100.65
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: SiO2N_wt_perc
Attribute_Definition:
Silica concentration, normalized with total of all oxide analyses, equaling 100 percent, determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 70.30
Range_Domain_Maximum: 75.80
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Rb_ppm
Attribute_Definition:
Rubidium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 153
Range_Domain_Maximum: 246
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Rb_XRF_ppm
Attribute_Definition:
Rubidium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 156
Range_Domain_Maximum: 220
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sr_XRF_ppm
Attribute_Definition:
Strontium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 74
Range_Domain_Maximum: 148
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Y_XRF_ppm
Attribute_Definition:
Yttrium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 24
Range_Domain_Maximum: 56
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Zr_ppm
Attribute_Definition:
Zirconium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 100
Range_Domain_Maximum: 460
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Zr_XRF_ppm
Attribute_Definition:
Zirconium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 97
Range_Domain_Maximum: 328
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nb_ppm
Attribute_Definition:
Niobium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12
Range_Domain_Maximum: 23
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nb_XRF_ppm
Attribute_Definition:
Niobium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12
Range_Domain_Maximum: 23
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sb_ppm
Attribute_Definition:
Antimony concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 2.8
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ba_ppm
Attribute_Definition:
Barium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 340
Range_Domain_Maximum: 1130
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ba_XRF_ppm
Attribute_Definition:
Barium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 237
Range_Domain_Maximum: 922
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Co_ppm
Attribute_Definition:
Cobalt concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.3
Range_Domain_Maximum: 7.2
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Cr_ppm
Attribute_Definition:
Chromium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 11.0
Range_Domain_Maximum: 32.4
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Cs_ppm
Attribute_Definition:
Cesium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.7
Range_Domain_Maximum: 13.7
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Hf_ppm
Attribute_Definition:
Hafnium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.3
Range_Domain_Maximum: 10.8
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ta_ppm
Attribute_Definition:
Tantalum concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.00
Range_Domain_Maximum: 1.92
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Th_ppm
Attribute_Definition:
Thorium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 13.4
Range_Domain_Maximum: 32.9
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: U_ppm
Attribute_Definition:
Uranium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.0
Range_Domain_Maximum: 5.4
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Zn_ppm
Attribute_Definition:
Zinc concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 24
Range_Domain_Maximum: 59
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sc_ppm
Attribute_Definition:
Scandium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.21
Range_Domain_Maximum: 10.80
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: La_ppm
Attribute_Definition:
Lanthanum concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 22
Range_Domain_Maximum: 87
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ce_ppm
Attribute_Definition:
Cerium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 49
Range_Domain_Maximum: 151
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ce_XRF_ppm
Attribute_Definition:
Cerium concentration, in parts per million, as determined by wavelength dispersive X-ray fluorescence. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 40
Range_Domain_Maximum: 121
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nd_ppm
Attribute_Definition:
Neodymium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 16
Range_Domain_Maximum: 70
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sm_ppm
Attribute_Definition:
Samarium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.0
Range_Domain_Maximum: 13.7
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Eu_ppm
Attribute_Definition:
Europium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.36
Range_Domain_Maximum: 1.50
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Gd_ppm
Attribute_Definition:
Gadolinium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.5
Range_Domain_Maximum: 12.7
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Tb_ppm
Attribute_Definition:
Terbium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.59
Range_Domain_Maximum: 1.78
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ho_ppm
Attribute_Definition:
Holmium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 1.5
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Tm_ppm
Attribute_Definition:
Thulium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.29
Range_Domain_Maximum: 0.71
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Yb_ppm
Attribute_Definition:
Ytterbium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.3
Range_Domain_Maximum: 4.4
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Lu_ppm
Attribute_Definition:
Lutetium concentration, in parts per million, as determined by instrumental neutron activation (INAA) analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.31
Range_Domain_Maximum: 0.67
Attribute_Units_of_Measure: parts per million (ppm)
Detailed_Description:
Entity_Type:
Entity_Type_Label: amphibolite_chemistry_westernYK_easternAK.csv
Entity_Type_Definition:
Table with sample information, including location, concentration amounts, and results of varied geochemistry analyses. The table contains 30 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier usually consisting of the last two digits of the year collected, abbreviation identifying the collector, with a one to three-digit number and possible one to two-letter suffix. Corresponds to the 'Sample' field in the other tables included with this data package.
Attribute:
Attribute_Label: Latitude
Attribute_Definition: Latitude of sample, as reported in datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 63.3582
Range_Domain_Maximum: 64.9075
Attribute_Units_of_Measure: Decimal degrees (NAD83)
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Longitude
Attribute_Definition: Longitude of sample, as reported in datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -141.0828
Range_Domain_Maximum: -147.9299
Attribute_Units_of_Measure: Decimal degrees (NAD83)
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Quad_250K
Attribute_Definition:
Name of 1:250,000-scale quadrangle topographic map in which the sample was collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: BD
Enumerated_Domain_Value_Definition: BD = Big Delta Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: EA
Enumerated_Domain_Value_Definition: EA = Eagle Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: FB
Enumerated_Domain_Value_Definition: FB = Fairbanks
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: TC
Enumerated_Domain_Value_Definition: TC = Tanacross Quadrangle
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Quad_63K
Attribute_Definition:
Location designation name of 1:63,360-scale topographic map in which the sample was collected.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values included in this field are the letters "A", "B", "C", or "D" followed by a hyphen and a single digit number.
Attribute:
Attribute_Label: Geologic_unit
Attribute_Definition:
Formal name of geologic rock assemblage, as noted in Dusel-Bacon and Cooper, 1999.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: CMC
Enumerated_Domain_Value_Definition: CMC = Chicken Metamorphic Complex
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: CRA
Enumerated_Domain_Value_Definition: CRA = Chena River Assemblage
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: FRA
Enumerated_Domain_Value_Definition: FRA = Fortymile River Assemblage
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: FRA(?)
Enumerated_Domain_Value_Definition: Queried value of Fortymile River Assemblage
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LGA
Enumerated_Domain_Value_Definition: LGA = Lake George Assemblage
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 70-Mile
Enumerated_Domain_Value_Definition: 70-Mile = Seventymile-Slide Mountain terrane
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Location_number
Attribute_Definition:
Location identification number referenced in Dusel-Bacon and Cooper, 1999.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 32
Attribute:
Attribute_Label: SiO2_wt_perc
Attribute_Definition:
Silica concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 43.90
Range_Domain_Maximum: 53.91
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Al2O3_wt_perc
Attribute_Definition:
Alumina concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12.30
Range_Domain_Maximum: 17.10
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Fe2O3_wt_perc
Attribute_Definition:
Ferric iron oxide concentration, determined by wavelength dispersive X-ray fluorescence. All iron reported as Fe2O3. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 7.96
Range_Domain_Maximum: 14.40
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MgO_wt_perc
Attribute_Definition:
Magnesium oxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.73
Range_Domain_Maximum: 12.40
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: CaO_wt_perc
Attribute_Definition:
Calcium oxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.39
Range_Domain_Maximum: 14.67
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Na2O_wt_perc
Attribute_Definition:
Sodium oxide concentration, determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.32
Range_Domain_Maximum: 4.82
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: K2O_wt_perc
Attribute_Definition:
Potassium oxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.10
Range_Domain_Maximum: 2.74
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: TiO2_wt_perc
Attribute_Definition:
Titanium oxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.63
Range_Domain_Maximum: 3.22
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: P2O5_wt_perc
Attribute_Definition:
Phosphorus pentoxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.07
Range_Domain_Maximum: 0.65
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MnO_wt_perc
Attribute_Definition:
Manganese oxide concentration, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 0.35
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: LOI_wt_perc
Attribute_Definition:
Loss on ignition, determined by wavelength dispersive X-ray fluorescence. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 6.58
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Total_wt_perc
Attribute_Definition:
Total weight percent of oxides, determined by wavelength dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 98.79
Range_Domain_Maximum: 100.55
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Rb_ppm
Attribute_Definition:
Rubidium concentration, in parts per million, as determined by energy-dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 82
Attribute_Units_of_Measure: parts per million
Attribute:
Attribute_Label: Sr_ppm
Attribute_Definition:
Strontium concentration, in parts per million, as determined by energy-dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 74
Range_Domain_Maximum: 813
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Y_ppm
Attribute_Definition:
Yttrium concentration, in parts per million, as determined by energy-dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 18
Range_Domain_Maximum: 41
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Zr_ppm
Attribute_Definition:
Zirconium concentration, in parts per million, as determined by energy-dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 49
Range_Domain_Maximum: 233
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nb_ppm
Attribute_Definition:
Niobium concentration, in parts per million, as determined by spectrophotometry or inductively coupled plasma atomic emission spectrometry. See table "zircon_titanite_geochemical_data_westernYK_easternAK_dataDictionary" for further details. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.3
Range_Domain_Maximum: 57.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ba_ppm
Attribute_Definition:
Barium concentration, in parts per million, as determined by energy-dispersive X-ray fluorescence.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 18
Range_Domain_Maximum: 1558
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Co_ppm
Attribute_Definition:
Cobalt concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 22.5
Range_Domain_Maximum: 56.9
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Cr_ppm
Attribute_Definition:
Chromium concentration, in parts per million, as determined by instrumental neutron-activation analysis. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.5
Range_Domain_Maximum: 677.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Cs_ppm
Attribute_Definition:
Cesium concentration, in parts per million, as determined by instrumental neutron-activation analysis. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 2.5
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Hf_ppm
Attribute_Definition:
Hafnium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.0
Range_Domain_Maximum: 6.1
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ta_ppm
Attribute_Definition:
Tantalum concentration, in parts per million, as determined by instrumental neutron-activation analysis. Blank cells are present. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 3.68
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Th_ppm
Attribute_Definition:
Thorium concentration, in parts per million, as determined by instrumental neutron-activation analysis. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.33
Range_Domain_Maximum: 11.00
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: U_ppm
Attribute_Definition:
Uranium concentration, in parts per million, as determined by instrumental neutron-activation analysis. An entry of "BDL" indicates a measurement below the detection limit of the instrument.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.30
Range_Domain_Maximum: 2.20
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Zn_ppm
Attribute_Definition:
Zinc concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 50
Range_Domain_Maximum: 291
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sc_ppm
Attribute_Definition:
Scandium concentration, in parts per million, as determined by instrumental neutron-activation analysis. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 19.3
Range_Domain_Maximum: 49.7
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: La_ppm
Attribute_Definition:
Lanthanum concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.2
Range_Domain_Maximum: 41.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ce_ppm
Attribute_Definition:
Cerium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.6
Range_Domain_Maximum: 71.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nd_ppm
Attribute_Definition:
Neodymium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.9
Range_Domain_Maximum: 37.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sm_ppm
Attribute_Definition:
Samarium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.7
Range_Domain_Maximum: 7.6
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Eu_ppm
Attribute_Definition:
Europium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.52
Range_Domain_Maximum: 2.20
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Tb_ppm
Attribute_Definition:
Terbium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.36
Range_Domain_Maximum: 1.19
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Yb_ppm
Attribute_Definition:
Ytterbium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.8
Range_Domain_Maximum: 5.1
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Lu_ppm
Attribute_Definition:
Lutetium concentration, in parts per million, as determined by instrumental neutron-activation analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.27
Range_Domain_Maximum: 0.72
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Cu_ppm
Attribute_Definition:
Copper concentration, in parts per million, as determined by emission spectroscopy.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.4
Range_Domain_Maximum: 530.0
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ni_ppm
Attribute_Definition:
Nickel concentration, in parts per million, as determined by emission spectroscopy.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 240
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: V_ppm
Attribute_Definition:
Vanadium concentration, in parts per million, as determined by emission spectroscopy.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 180
Range_Domain_Maximum: 420
Attribute_Units_of_Measure: parts per million (ppm)
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Resource_Description:
The U.S. Geological Survey, Alaska Science Center is the authoritative source and distributor of these data.
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data for other purposes or on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: CSV
Format_Information_Content:
Data are distributed in a Zip package containing data in CSV and PDF format; FGDC metadata is distributed in XML and HTML formats.
File_Decompression_Technique:
Compression applied by the 7-Zip utility using the default compression level [5]. The Zip package can be decompressed and unpacked by open source or commercially available unzip tools.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P93ZWGA1
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20230808
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata (CSDGM)
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.52 on Tue Aug 8 12:38:38 2023