U-Pb Ages, Hafnium Isotope Ratios, and Trace Element Concentrations by Laser-ablation Split Stream (LASS) Analysis of Igneous and Metamorphic Zircons from the Yukon-Tanana Upland, Eastern Alaska

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Todd, Erin (ORCID: 0000-0002-4871-9730)
Originator: Kylander-Clark, Andrew (ORCID: 0000-0002-4034-644x)
Originator: Kreiner, Douglas C. (ORCID: 0000-0002-4405-1403)
Originator: Jones, James V., III (ORCID: 0000-0002-6602-5935)
Originator: Holm-Denoma, Chris (ORCID: 0000-0003-3229-5440)
Originator: Wypych, Alicja
Publication_Date: 20230425
Title:
U-Pb Ages, Hafnium Isotope Ratios, and Trace Element Concentrations by Laser-ablation Split Stream (LASS) Analysis of Igneous and Metamorphic Zircons from the Yukon-Tanana Upland, Eastern Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Other_Citation_Details:
Suggested Citation: Todd, E., Kylander-Clark, A., Kreiner, D.C., Jones, J,V. III, Holm-Denoma, C., and Wypych, A., 2023, U-Pb ages, Hafnium isotope ratios, and trace element concentrations by Laser-ablation Split Stream (LASS) Analysis of igneous and metamorphic zircons from the Yukon-Tanana Upland, eastern Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P9O1DMIE
Online_Linkage: https://doi.org/10.5066/P9O1DMIE
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 set contains U-Pb isotopic data and ages, Hf isotope data, and trace element concentrations of zircon from igneous rocks collected from the Yukon-Tanana Upland, eastern Alaska. The sample suite was collected as part of geological mapping and supporting geochemical and geochronological analysis conducted from 2013 to 2019. Zircon was obtained from these igneous rocks to determine the crystallization age for the bedrock samples. The data tables accompanying this data release report the composition of uranium (U) and thorium (Th) measured in each grain, ratios of three isotopes of lead (206Pb, 207Pb, 208Pb), two isotopes of uranium (235U and 238U), and one isotope of thorium (232Th), as well as the age of each grain, plus trace element abundances from the same ablated aliquot, including P, V, Sr, high field strength elements (HFSE), and rare earth elements (REE). Reported Hf (and Lu) isotope data includes 176Hf/177Hf, 176Lu/177Hf, and 178Hf/177Hf ratios, calculated epsilon Hf values, and age-corrected isotope ratios and epsilon values.
Purpose:
U-Pb zircon dates and compositions from igneous rocks aid in the interpretation of the age of original formation (e.g. crystallization age) and sources of igneous rocks with variety of compositions. These data will be used in support of multiple geological maps, reports, and papers that describe the geological framework and mineral resource potential of the region.
Supplemental_Information:
Sample collection was funded by the Mineral Resources Program of the U.S. Geological Survey. Bulk rock samples were processed into concentrated mineral separates in USGS laboratories in Denver, Colorado, by Apatite to Zircon, Inc. (A2Z), or by Zirchron, LLC, and analyzed at the laser-ablation split-stream (LASS) laboratory at the University of California, Santa Barbara. The LASS configuration splits the laser-ablated aerosol stream between a quadrupole inductively coupled plasma spectrometer (Q-ICPMS) and a multi-collector inductively coupled plasma spectrometer (MC-ICP-MS), enabling simultaneous measurements of ages, trace elements, and Hf isotopes on the same volume of ablated material. U-Th-Pb isotopes and trace element concentrations were analyzed by Q-ICPMS, while Hf isotopes were analyzed by MC-ICP-MS. In some cases, an alternate LASS configuration was used, measuring U-Th-Pb isotopes by MC-ICP-MS, and trace elements by Q-ICPMS. For a few samples, Hf isotopes only were analyzed on picked grains from samples that have already been analyzed by sensitive high-resolution ion microprobe (SHRIMP; Jones and O'Sullivan, 2020). A subset of samples in this study have been previously analyzed for U-Th-Pb isotopes and/or trace element concentrations by either SHRIMP (Jones and O'Sullivan, 2020; Kreiner and Vasquez, 2022) or by LA-ICPMS (Holm-Denoma, 2023-IN PREP; Wildland et al., 2021). Whole rock geochemistry for most studied samples is presented in Todd et al. (2022), while a subset is from Wypych et al. (2019). Raw LASS data for six samples in this study previously appeared in Todd et al. (2019), but summary statistics and interpreted ages presented here have been recalculated reflecting a nominal refinement of the data reduction and/or filtering methodology. Detailed mechanical and quantitative methods, instrument configurations, and standards results are documented in a supplemental PDF document included in this data release: Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2023
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -151.33
East_Bounding_Coordinate: -139.36
North_Bounding_Coordinate: 65.79
South_Bounding_Coordinate: 61.56
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC534
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geochronology
Theme_Keyword: igneous rocks
Theme_Keyword: radiometric dating
Theme:
Theme_Keyword_Thesaurus: GeoRef Thesaurus
Theme_Keyword: age-dating
Theme_Keyword: Lu/Hf
Theme_Keyword: U/Pb
Theme_Keyword: U/Th/Pb
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: laser-ablation split-stream
Theme_Keyword: LASS
Theme_Keyword:
laser-ablation multi collector inductively coupled plasma mass spectrometry
Theme_Keyword: LA-MC-ICPMS
Theme_Keyword: trace elements
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Alaska Range
Place_Keyword: Tanana River
Place_Keyword: Yukon River
Access_Constraints: None
Use_Constraints:
It is requested that the authors 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_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Each run in each analytical session began with a round-robin of multiple analyses of zircon reference materials (RM), including 91500, GJ1, Plesovice, Mud Tank, and Temora2 to constrain isotope fractionation and measured 206Pb/238U and 207Pb/206Pb ratios was at or near 1 percent. The same zircon RM were interleaved among samples, with one analysis of 91500 plus a rotation of the other four RM run after every eighth sample spot. All measured isotopic ratios are reported with associated analytical uncertainty. Hf isotope ratios measured on these standard reference materials agree within error to accepted values. Trace element data are calibrated with analysis of matrix-matched reference materials (91500 and GJ1) interleaved among samples.
Logical_Consistency_Report:
No unexpected values are found in these data. Blank cells in the data tables indicate values were either not provided, not measured, or not calculated. The geochronological data provided in this data release may contain trailing zeros. If the CSV files are opened directly in Microsoft Excel, data values may be truncated.
Completeness_Report:
This dataset contains LASS procedural analysis on samples selected from within a specific area of interest in the eastern portion of the Alaska Range. The dataset includes instances of failed analyses of specific grains due to instrumentation error.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal position was measured in different ways, depending on the date and/or type of the sample collection. Location of samples collected since 2000 were determined by hand-held GPS units with positional accuracy of three meters or less, but those individuals collecting the sample may have reported their positions at time of collection in either datum NAD83 or datum WGS84, as noted in the field 'Datum'. For the locations of the samples collected prior to 2000, these were marked on 1:63,360 scale topographic sheets in datum NAD27 by the original collector. The latitude and longitude positions were read from the NAD27 topographic sheets and then converted to NAD83.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS Alaska Science Center
Publication_Date: 2023
Title:
Supplemental Info: Zircon U-Pb geochronology, Hf isotope and trace element concentration analytical methods using UCSB Laser-ablation Split Stream (LASS) Analysis
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Supplemental PDF document included with this data package: "Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf"
Online_Linkage: https://doi.org/10.5066/P9O1DMIE
Type_of_Source_Media: document
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2023
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: LASS Analytical Methods
Source_Contribution:
Provides detailed description of laboratory methods used in Laser Ablation Split-Stream (LASS) procedures and measurements (LASS and LA-ICPMS) performed in this study. Also contains summary quantitative standards results from the same analytical sessions in which samples in this data release were analyzed.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Blichert-Toft, J.
Originator: Albarede, F.
Publication_Date: 1997
Title:
The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Earth and Planetary Science Letters
Issue_Identification: 148(1):243-258
Publication_Information:
Publication_Place: online
Publisher: Elsevier
Other_Citation_Details:
Blichert-Toft, J., Albarede, F. 1997. The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system. Earth and Planetary Science Letters 148(1):243-258 doi:10.1016/S0012-821X(97)00040-X
Online_Linkage: https://doi.org/10.1016/S0012-821X(97)00040-X
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Blichert-Toft and Albarède, 1997
Source_Contribution: Calculation of age-corrected Hafnium values
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ferry, J.M.
Originator: Watson, E.B.
Publication_Date: 2007
Title:
New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Contributions to Mineralogy and Petrology
Issue_Identification: 154(4):429-437
Publication_Information:
Publication_Place: online
Publisher: Springer Link
Other_Citation_Details:
Ferry, J.M., Watson, E.B. 2007. New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers. Contributions to Mineralogy and Petrology 154(4):429-437 doi:10.1007/s00410-007-0201-0
Online_Linkage: https://doi.org/10.1007/s00410-007-0201-0
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2007
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Ferry and Watson, 2007
Source_Contribution: Calculation of thermodynamic models and calibrations
Source_Information:
Source_Citation:
Citation_Information:
Originator: Griffin, W.L.
Originator: Pearson, N.J.
Originator: Belousova, E.A.
Originator: Jackson, S.E.
Originator: van Achterbergh, E.
Originator: O'Reilly, S.Y.
Originator: Shee, S.R.
Publication_Date: 2000
Title:
The Hf isotope composition of cratonic mantle—LAM-MC-ICPMS analysis of zircon megacrysts in kimberlites
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Geochimica et Cosmochimica Acta
Issue_Identification: 64(1):133-147
Publication_Information:
Publication_Place: online
Publisher: Elsevier
Other_Citation_Details:
Griffin, W.L., Pearson, N.J., Belousova, E.A., Jackson, S.E., van Achterbergh, E., O'Reilly, S.Y., Shee, S.R. 2000. The Hf isotope composition of cratonic mantle: LAM-MC-ICPMS analysis of zircon megacrysts in kimberlites. Geochimica et Cosmochimica Acta 64(1):133-147 doi:10.1016/S0016-7037(99)00343-9
Online_Linkage: https://doi.org/10.1016/s0016-7037(99)00343-9
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: Griffin et al., 2000
Source_Contribution: Analysis of Lutetium-Hafnium ratios
Source_Information:
Source_Citation:
Citation_Information:
Originator: Scherer, E.E.
Originator: Munker, C.
Originator: Mezger, K.
Publication_Date: 2001
Title: Calibration of the Lutetium-Hafnium clock
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Science
Issue_Identification: 293(5530):683-687
Publication_Information:
Publication_Place: online
Publisher: American Association for the Advancement of Science
Other_Citation_Details:
Scherer, E., Munker, C., Mezger, K. 2001. Calibration of the Lutetium-Hafnium clock. Science 293(5530):683-687 doi:10.1126/science.1061372
Online_Linkage: https://doi.org/10.1126/science.1061372
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2001
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Scherer et al., 2001
Source_Contribution: Calculation of age-corrected Lutetium-Hafnium values
Source_Information:
Source_Citation:
Citation_Information:
Originator: Holm-Denoma, C.
Publication_Date: 2023
Title:
U-Pb zircon data for igneous units related to mineralization in the eastern Yukon-Tanana Upland and nearby areas, eastern Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Other_Citation_Details:
Holm-Denoma, C., 2023, U-Pb zircon data for igneous units related to mineralization in the eastern Yukon-Tanana Upland and nearby areas, eastern Alaska (IN PREP), https://doi.org/10.5066/xxxxxxx
Online_Linkage: https://doi.org/10.5066/xxxxxxx
Type_of_Source_Media: digital database file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2023
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Holm-Denoma, 2023
Source_Contribution:
LA-ICPMS geochronology for some samples replicated here with different analytical configuration (LASS) using new grain mounts of previously un-analyzed grains from the same mineral separate.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kreiner, D.C.
Originator: Vasquez, J.
Publication_Date: 2022
Title:
Zircon trace element data for igneous units related to mineralization in the eastern Yukon-Tanana upland and nearby areas, eastern Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: 10.5066/P9Q6GYMH
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Kreiner, D.C. and Vasquez, J., 2022, Zircon trace element data for igneous units related to mineralization in the eastern Yukon-Tanana upland and nearby areas, eastern Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P9Q6GYMH
Online_Linkage: https://doi.org/10.5066/P9Q6GYMH
Type_of_Source_Media: online database
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2022
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Kreiner and Vasquez, 2022
Source_Contribution:
Zircon trace element data for a subset of samples reanalyzed here (by LASS) using new grain mounts of previously un-analyzed grains from the same mineral separate.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Todd, E.
Originator: Jones, J.V., III
Originator: Caine, J.S.
Originator: Kreiner, D.C.
Originator: Holm-Denoma, C.
Originator: Allard, A.J.
Originator: Lease, R.O.
Originator: Case, G.N.
Originator: Wypych, A.
Publication_Date: 2022
Title:
Whole Rock Major and Trace Element Chemistry for Igneous and Metamorphic Rocks from the Yukon-Tanana Upland, Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: 10.5066/P9AX4NAE
Publication_Information:
Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Todd, E., Jones, J.V. III, Caine, J.S., Kreiner, D.C., Holm-Denoma, C, Allard, A.J, Lease, R.O., Case, G.N., and Wypych, A., 2022, Whole rock major and trace element chemistry for igneous and metamorphic rocks from the Yukon-Tanana Upland, Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P9AX4NAE
Online_Linkage: https://doi.org/10.5066/P9AX4NAE
Type_of_Source_Media: online database
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2022
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Todd et al., 2022
Source_Contribution:
Whole-rock geochemical compositions for most of the samples included in this study.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Wildland, A.D.
Originator: Wypych, A.
Originator: Regan, S.P.
Originator: Holland, M.
Publication_Date: 2021
Title:
U-Pb zircon ages from bedrock samples collected in the Tanacross and Nabesna quadrangles, eastern Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name:
Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report
Issue_Identification: DGGS PIR 2021-4
Publication_Information:
Publication_Place: online
Publisher: Alaska Division of Geological and Geophysical Surveys
Other_Citation_Details:
Wildland, A.D., Wypych, Alicja, Regan, S.P., and Holland, Mark, 2021, U-Pb zircon ages from bedrock samples collected in the Tanacross and Nabesna quadrangles, eastern Alaska; Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2021-4, https://doi.org/10.14509/30732
Online_Linkage: https://doi.org/10.14509/30732
Type_of_Source_Media: online database
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2021
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Wildland et al., 2021
Source_Contribution:
LA-ICPMS geochronology for a subset of samples reanalyzed here by LASS, analyzing many of the same grains on the same grain mounts.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Jones, J.V., III
Originator: O'Sullivan, P.B.
Publication_Date: 2020
Title:
U-Pb Isotopic Data and Ages of Zircon and Titanite from Rocks from the Yukon-Tanana Upland, Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: 10.5066/P9WWV93S
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Jones, J.V., III and O'Sullivan, P.B., 2020, U-Pb Isotopic Data and Ages of Zircon and Titanite from Rocks from the Yukon-Tanana Upland, Alaska; U.S. Geological Survey data release, https://doi.org/10.5066/P9WWV93S
Online_Linkage: https://doi.org/10.5066/P9WWV93S
Type_of_Source_Media: online database
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2020
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Jones and O'Sullivan, 2020
Source_Contribution:
SHRIMP and LA-ICPMS geochronology and trace element data for a subset of samples reanalyzed here (by multiple configurations) using new grain mounts of previously un-analyzed grains from the same mineral separate.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Wypych, A.
Originator: Twelker, E.
Originator: Naibert, T.J.
Originator: Athey, J.E.
Originator: Newberry, R.J.
Originator: Lopez, J.A.
Originator: Regan, S.P.
Originator: Sicard, K.R.
Originator: Wildland, A.D.
Originator: Wyatt, W.C.
Publication_Date: 2019
Title:
Major-oxide and trace-element geochemical data from rocks collected in 2019 for the Eastern Tanacross project, Tanacross and part of Nabesna quadrangles, Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name:
Alaska Division of Geological and Geophysical Surveys Raw Data File
Issue_Identification: DGGS RDF 2019-8
Publication_Information:
Publication_Place: online
Publisher: Alaska Division of Geological and Geophysical Surveys
Other_Citation_Details:
Wypych, A., Twelker, E., Naibert, T.J., Athey, J.E., Newberry, R.J., Lopez, J.A., Regan, S.P., Sicard, K.R., Wildland, A.D., and Wyatt, W.C., 2019, Major-oxide and trace-element geochemical data from rocks collected in 2019 for the Eastern Tanacross project, Tanacross and part of Nabesna quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Raw Data File 2019-8, 3 p. https://doi.org/10.14509/30267
Online_Linkage: https://doi.org/10.14509/30267
Type_of_Source_Media: digital database file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Wypych et al., 2019
Source_Contribution:
Whole-rock geochemical compositions of a subset of samples included in this study.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Todd, E.
Originator: Wypych, A.
Originator: Kylander-Clark, A.R.C.
Publication_Date: 2019
Title:
U-Pb and Lu-Hf isotope, age, and trace element data from zircon separates from the Tanacross D-1, and parts of D-2, C-1, and C-2 quadrangles
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name:
Alaska Division of Geological and Geophysical Surveys Raw Data File
Issue_Identification: DGGS RDF 2019-5
Publication_Information:
Publication_Place: online
Publisher: Alaska Division of Geological and Geophysical Surveys
Other_Citation_Details:
Todd, E., Wypych, A., and Kylander-Clark, A.R.C., 2019, U-Pb and Lu-Hf isotope, age, and trace element data from zircon separates from the Tanacross D-1, and parts of D-2, C-1, and C-2 quadrangles: Alaska Division of Geological and Geophysical Surveys Raw Data File 2019-5, 10 p. https://doi.org/10.14509/30198
Online_Linkage: https://doi.org/10.14509/30198
Type_of_Source_Media: Digital and/or Hardcopy
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Todd et al., 2019
Source_Contribution:
First appearance of subset of samples included, and recalculated, here.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Wilson, F.H.
Originator: Hults, C.P.
Originator: Mull, C.G.
Originator: Karl, S.M.
Publication_Date: 2015
Title:
Geologic Map of Alaska: USGS Scientific Investigations Map, v. 3340
Geospatial_Data_Presentation_Form: digital database file
Series_Information:
Series_Name: USGS Scientific Investigations Map
Issue_Identification: 3340
Publication_Information:
Publication_Place: online
Publisher: U.S. Geological Survey
Other_Citation_Details:
Wilson, F.H., Hults, C.P., Mull, C.G., and Karl, S.M., 2015, Geologic Map of Alaska: USGS Scientific Investigations Map, v. 3340, 204 p.; https://doi.org/10.3133/sim3340
Online_Linkage: https://doi.org/10.3133/sim3340
Type_of_Source_Media: Digital and/or Hardcopy
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Wilson et al., 2015
Source_Contribution: Describes geologic age and type nomenclatures.
Process_Step:
Process_Description:
Zircon grains were separated from crushed and ground samples using standard magnetic and heavy liquid techniques, hand-picked under binocular microscope, and mounted in epoxy discs. The mounts were ground to expose the grain interior, further polished, and imaged using a digital camera mounted to a binocular picking microscope to identify any inclusions or other features such as cracks to be avoided during analysis. Detailed analytical procedures are described in the accompanying document included in this data package: "Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf".
Process_Date: 2021
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name:
North American Datum of 1983 (NAD83) and World Geodetic System 1984 (WGS84)
Ellipsoid_Name: Geodetic Reference System 1980 and WGS_1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_LASS_DataDictionary_YukonTanana_AK_Todd.csv
Entity_Type_Definition:
Table describing all fields in each table included in this data package. Includes field names, a brief description of each field, and the data units, if applicable. This table contains 140 records and is presented in comma separated value (.csv) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: TABLE
Attribute_Definition: Name of the data table the field is found in.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: geology_LASS_Data_YukonTanana_AK_Todd
Enumerated_Domain_Value_Definition: Filename of CSV data table
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: geology_LASS_SampleSummary_YukonTanana_AK_Todd
Enumerated_Domain_Value_Definition: Filename of CSV data table
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: FIELD_NAME
Attribute_Definition: Field name found in data table listed in field 'TABLE'.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Attributes in this field are single words or concatenated abbreviations that describe the contents of the field.
Attribute:
Attribute_Label: FIELD_EXPLANATION
Attribute_Definition: Brief description of the contents of 'FIELD_NAME'.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Attributes in this field are brief descriptions of the contents of 'FIELD_NAME'.
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: not applicable
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: cps
Enumerated_Domain_Value_Definition: counts per second
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: decimal degrees
Enumerated_Domain_Value_Definition: unit of angular measure
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: degrees C
Enumerated_Domain_Value_Definition: degrees Celsius
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ga
Enumerated_Domain_Value_Definition: Giga-annum, or billions of years before present
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ma
Enumerated_Domain_Value_Definition: Mega-annum, or millions of years before present
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ppm
Enumerated_Domain_Value_Definition: parts per million
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: um
Enumerated_Domain_Value_Definition: micrometers
Enumerated_Domain_Value_Definition_Source: Author defined
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_LASS_SampleSummary_YukonTanana_AK_Todd.csv
Entity_Type_Definition:
Table with sample information, including location, rock descriptions, hafnium isotope data, median trace element concentrations, and geochronology analysis summary data. This table contains 243 records and is presented in comma separated value (.csv) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Index
Attribute_Definition:
Numeric identifier used for sorting purposes within this table only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 243
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field; USGS identifier.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Sample identifier; most labels consist of the last two digits of the year collected, an abbreviation identifying the collector, and a number and possible suffix. Sample identifiers link to field Sample in table "geology_LASS_Data_YukonTanana_AK_Todd.csv" included with this data package.
Attribute:
Attribute_Label: LONGITUDE
Attribute_Definition:
Sample location longitude in decimal degrees, datum NAD83 or datum WGS84. See 'DATUM' field
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -151.3217
Range_Domain_Maximum: -139.3644
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: LATITUDE
Attribute_Definition:
Sample location latitude in decimal degrees, datum NAD83 or datum WGS84. See 'DATUM' field
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 61.5693
Range_Domain_Maximum: 65.7834
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: DATUM
Attribute_Definition:
Geodetic reference system model name attributed to collected sample location, as noted by the sample collector.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NAD83
Enumerated_Domain_Value_Definition:
North American Datum 1983, using a semi-major axis of 6378137m and a flattening ratio of 298.257222101
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: WGS84
Enumerated_Domain_Value_Definition:
World Geodetic System 1984, using a semi-major axis of 6378137.0m and a flattening ratio of 298.257223563
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: UNIT
Attribute_Definition: Geologic map unit designator at sample location.
Attribute_Definition_Source: Author Defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field are geologic age and type nomenclatures as described in publication Wilson et al. (2015): Geologic Map of the State of Alaska, Scientific Investigations Map 3340.
Attribute:
Attribute_Label: ROCK_CLASS
Attribute_Definition: Rock type (Igneous, metamorphic, or sedimentary).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Igneous
Enumerated_Domain_Value_Definition: Primary rock classification = Igneous
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Igneous - Meta
Enumerated_Domain_Value_Definition: Primary rock classification = Metamorphosed Igneous rock
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Metamorphic
Enumerated_Domain_Value_Definition: Primary rock classification = Metamorphic
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sedimentary
Enumerated_Domain_Value_Definition: Primary rock classification = Sedimentary
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: ROCK_NAME
Attribute_Definition: Rock name, as described in original collector field notes.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values present represent a generalized sample rock nomenclature.
Attribute:
Attribute_Label: ROCK_COMMENT
Attribute_Definition: A more detailed rock description.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
This free text field contains a generally more detailed and descriptive rock description than 'ROCK_NAME', including field descriptions and/or petrographic observations.
Attribute:
Attribute_Label: UPb_Age_Interpretation
Attribute_Definition:
Interpretation whether an analyzed population represents the main crystallization stage of the host rock, metamorphic zircon growth, or that no age was determined.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values include variations on age determinations made and the confidence that the data enables. The value "Crystallization age" means the analyzed grain represents the main crystallization stage of the host rock, but varying levels of confidence of that determination are also noted for some samples.
Attribute:
Attribute_Label: Mount
Attribute_Definition:
Internal laboratory alphanumeric identifier for a specific sample mount, or "[TS]" for in-situ analyses of grains identified from polished thin sections.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field typically consist of three letter initials followed by a one- to three-digit number, denoting a specific sample mount. In a few cases, grains for the same sample were analyzed from different prepared grain mounts, from polished thin sections, or a combination, as indicated.
Attribute:
Attribute_Label: Session_Run
Attribute_Definition:
Year and month of analytical session, and Run sequence within that session, when analysis was conducted.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this data set are a concatenation of the calendar year followed by a "/", the number associated with the calendar month, a two-digit number indicating the procedural sequence during the month indicated, the word "_RUN_", and a two-digit number. Analytical sessions where polished thin sections are ablated are denoted by "TS" between year and run number. Multiple runs are indicated in certain cells, with unique sessions separated by "&".
Attribute:
Attribute_Label: Spot_Size_um
Attribute_Definition: Laser spot size during analyses, in micrometers (um).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field are concatenated numeric spot analysis sizes from the instrument in micrometers and the suffix "um". Some samples were run with more than one spot size, as indicated (separated by "&").
Attribute:
Attribute_Label: Laser_Run_Conditions
Attribute_Definition:
Laser run conditions during analysis; repetition rate (Hz), fluence (%) and Output (mJ).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The attributes in this field are a concatenation of the frequency of the laser in Hz (cycles per second), power setting of the laser in % (percent), and output power setting of the laser in mJ (milliJoules). For samples analyzed during different analytical sessions, distinct run conditions are separated by "&".
Attribute:
Attribute_Label: Comment_age
Attribute_Definition: Comments on sample age or analytical observations.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set include specific additional or amplifying remarks with regard to the type of analysis or procedures utilized. This is a free text field.
Attribute:
Attribute_Label: Comment_chem
Attribute_Definition:
Comments on sample trace elements or hafnium isotope observations. Blank cells may be present, indicating that no additional chemistry observations were made as a result of the procedures completed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set include general observations regarding procedural results. This is a free text field.
Attribute:
Attribute_Label: Spots_total
Attribute_Definition:
Total number of zircon measurements made for a sample population.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 68
Attribute:
Attribute_Label: Method
Attribute_Definition:
Analytical configuration used; "LASS" is short for laser-ablation split-stream, simultaneous quadrupole inductively coupled plasma spectrometer (Q-ICPMS) and multi-collector inductively coupled plasma spectrometer (LA-MC-ICP-MS) analyses, typically measuring U-Th-Pb and trace elements on Q-ICPMS and Hf isotopes on MC-ICP-MS. "LASS (UPb on MC)" is a split-stream configuration measuring U-Th-Pb on MC-ICP-MS, with trace elements measured by Q-ICPMS. "LA-MC-ICPMS (Hf on MC)" indicates measurement of Hf isotopes on MC-ICP-MS only. For samples with LA-MC-ICP-MS Hf isotope and concentration (in ppm) analyses only, ages and TE concentrations shown in summary table geology_LASS_SampleSummary_YukonTanana_AK_Todd.csv are measured by SHRIMP, from Jones and O'Sullivan (2020). "LA-MC-ICPMS (UPb on MC)" indicates measurement of U-Th-Pb isotopes on MC-ICP-MS only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a free text field, and the values present in this field are the names and types of methods as noted in the attribute definition. Multiple methods may be noted for samples that were analyzed in multiple runs or configurations, in keeping with the summary nature of this table.
Attribute:
Attribute_Label: UPb_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of weighted means of U-Pb ages. The difference between these numbers reflect outlier rejections using a modified 2-sigma criterion, as described in the Supplement ("Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf") included with this data package. Blank cells may be present, indicating no measurements were possible.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: [X] of [Y]
Enumerated_Domain_Value_Definition:
A series of results in the format, where [X] indicates number of measurements used and [Y] indicates the number of measurements permitted.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SHRIMP
Enumerated_Domain_Value_Definition:
Indicates age shown is the published weighted mean age, from sources detailed in Supplement.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: single grain
Enumerated_Domain_Value_Definition: single grain
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: none
Enumerated_Domain_Value_Definition: no measurements
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Hf_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of weighted means of hafnium isotopes. The difference between these numbers reflects outlier rejections using a modified 2 sigma criterion, as described in the Supplement ("Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf") included with this data package. Blank cells may be present, indicating no measurements were possible.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: [X] of [Y]
Enumerated_Domain_Value_Definition:
A series of results in the format, where [X] indicates number of measurements used and [Y] indicates the number of measurements permitted.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: single grain
Enumerated_Domain_Value_Definition: single grain
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: none
Enumerated_Domain_Value_Definition: no measurements
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: TE_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of medians of trace element compositions. "SHRIMP" indicates compositions shown are the median of published values, from sources detailed in Supplement ("Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf") included with this data package. Blank cells may be present, indicating no measurements were possible.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: [X] of [Y]
Enumerated_Domain_Value_Definition:
A series of results in the format, where [X] indicates number of measurements used and [Y] indicates the number of measurements permitted.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SHRIMP
Enumerated_Domain_Value_Definition:
Indicates compositions shown are the median of published values, from sources detailed in Supplement.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: single grain
Enumerated_Domain_Value_Definition: single grain
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: none
Enumerated_Domain_Value_Definition: no measurements
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Age_Type
Attribute_Definition:
Method used to calculate the ages that yielded a valid result. Sources detailed in the Supplement ("Supplemental_Info_Analytical_Methods_UCSB_LASS_YTT.pdf") included with this data package. Blank cells are present, indicating no age type was determined.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: age7corr
Enumerated_Domain_Value_Definition:
Indicates 207Pb-corrected 206Pb/238U ages (Ma), for 206Pb/238U ages < 1.4Ga
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: agepb76
Enumerated_Domain_Value_Definition: Indicates 07Pb/206Pb age (Ma) for 206Pb/238U ages >1.4Ga
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SHRIMP
Enumerated_Domain_Value_Definition:
Indicates that published Sensitive High Resolution Ion Microprobe data for age determination was used, from sources detailed in the Supplement
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: w_mean_age_Ma
Attribute_Definition:
Weighted mean of permissible calculated ages (Ma) for a sample population. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 56.8
Range_Domain_Maximum: 1895.8
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: w_mean_age_Ma_2sigma
Attribute_Definition:
2-sigma (uncertainty) in the weighted mean of permissible calculated ages (Ma) for a sample population. Long-term instrument reproducibility is typically higher than analytical uncertainty, approximately 2% of the age. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.3
Range_Domain_Maximum: 76.5
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: MSWD
Attribute_Definition:
Mean square weighted deviation of permissible ages for a sample population; blank cells are present to indicate either single grains, published SHRIMP ages, or no data available to complete the calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 33.00
Attribute:
Attribute_Label: 176Hf_177Hf_ratio
Attribute_Definition:
Weighted mean of permissible ratios of 176Hf to 177Hf for a sample population. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.281481
Range_Domain_Maximum: 0.283158
Attribute:
Attribute_Label: 176Hf_177Hf_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for weighted mean of permissible ratios of 176Hf to 177Hf for a sample population. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000013
Range_Domain_Maximum: 0.000260
Attribute:
Attribute_Label: 176Lu_177Hf_ratio
Attribute_Definition:
The weighted mean of permissible ratios of 176Lu to 177Hf for a sample population. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000228
Range_Domain_Maximum: 0.004818
Attribute:
Attribute_Label: 176Lu_177Hf_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for the weighted mean of permissible ratios of 176Lu to 177Hf for a sample population. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000002
Range_Domain_Maximum: 0.009329
Attribute:
Attribute_Label: eHf
Attribute_Definition:
Epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -45.66
Range_Domain_Maximum: 13.65
Attribute:
Attribute_Label: eHf_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.46
Range_Domain_Maximum: 9.19
Attribute:
Attribute_Label: 176Hf_177Hf_T
Attribute_Definition:
Age-corrected 176Hf/177Hf ratio, assuming Lutetium-176 decay constant of 1.86x10e-11 (Scherer et al., 2001). Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.281460
Range_Domain_Maximum: 0.283153
Attribute:
Attribute_Label: eHf_T
Attribute_Definition:
Age-corrected epsilon Hf value assuming chondritic 176Hf/177Hf ratio of 0.282772 and 176Lu/177Hf ratio of 0.0332 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -24.38
Range_Domain_Maximum: 15.58
Attribute:
Attribute_Label: T_DM_Hf
Attribute_Definition:
Model age in billions of years before present (Ga) assuming a present-day depleted mantle 176Lu/177Hf and 176Hf/177Hf of 0.0384 and 0.28325 (Griffin et al., 2000). Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.14
Range_Domain_Maximum: 2.46
Attribute_Units_of_Measure: (Ga) Giga-annum, or billions of years before present
Attribute:
Attribute_Label: m_Zr_ppm
Attribute_Definition:
Median zirconium (Zr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.33E+05
Range_Domain_Maximum: 5.01E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Si_ppm
Attribute_Definition:
Median silica (Si) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.43E+05
Range_Domain_Maximum: 1.81E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_P_ppm
Attribute_Definition:
Median phosphorous (P) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.9
Range_Domain_Maximum: 3294.5
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ti_ppm
Attribute_Definition:
Median titanium (Ti) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.45
Range_Domain_Maximum: 303.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_V_ppm
Attribute_Definition:
Median vanadium (V) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author Defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.05
Range_Domain_Maximum: 1335.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Sr_ppm
Attribute_Definition:
Median strontium (Sr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.10
Range_Domain_Maximum: 2.89
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Y_ppm
Attribute_Definition:
Median yttrium (Y) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 333
Range_Domain_Maximum: 28500
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Nb_ppm
Attribute_Definition:
Median niobium (Nb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.35
Range_Domain_Maximum: 243.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_La_ppm
Attribute_Definition:
Median lanthanum (La) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.005
Range_Domain_Maximum: 88.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ce_ppm
Attribute_Definition:
Median cerium (Ce) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.9
Range_Domain_Maximum: 1290.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Pr_ppm
Attribute_Definition:
Median praseodymium (Pr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 70.90
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Nd_ppm
Attribute_Definition:
Median neodymium (Nd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.3
Range_Domain_Maximum: 774.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Sm_ppm
Attribute_Definition:
Median samarium (Sm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 129.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Eu_ppm
Attribute_Definition:
Median europium (Eu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 146.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Gd_ppm
Attribute_Definition:
Median gadolinium (Gd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.3
Range_Domain_Maximum: 573.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Tb_ppm
Attribute_Definition:
Median terbium (Tb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.6
Range_Domain_Maximum: 193.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Dy_ppm
Attribute_Definition:
Median dysprosium (Dy) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 20.7
Range_Domain_Maximum: 2520.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ho_ppm
Attribute_Definition:
Median holmium (Ho) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9.3
Range_Domain_Maximum: 1170.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Er_ppm
Attribute_Definition:
Median erbium (Er) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 52
Range_Domain_Maximum: 4450
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Tm_ppm
Attribute_Definition:
Median thulium (Tm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12.7
Range_Domain_Maximum: 846.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Yb_ppm
Attribute_Definition:
Median ytterbium (Yb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 114
Range_Domain_Maximum: 5520
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Lu_ppm
Attribute_Definition:
Median lutetium (Lu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 22.2
Range_Domain_Maximum: 922.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Hf_ppm
Attribute_Definition:
Median hafnium (Hf) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3595
Range_Domain_Maximum: 13850
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ta_ppm
Attribute_Definition:
Median tantalum (Ta) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.203
Range_Domain_Maximum: 113.400
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Pb_ppm
Attribute_Definition:
Median lead (Pb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 30.1
Range_Domain_Maximum: 71.7
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Th_ppm
Attribute_Definition:
Median thorium (Th) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 15
Range_Domain_Maximum: 19450
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_U_ppm
Attribute_Definition:
Median uranium (U) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 39
Range_Domain_Maximum: 25400
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: T_C
Attribute_Definition:
Ti-in-zircon thermometer (degrees C), after Ferry and Watson (2007), calculated using median Ti concentrations and assuming SiO2 and TiO2 of 0.7. Blank cells are present, indicating data was not available to complete this calculation.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 593
Range_Domain_Maximum: 1289
Attribute_Units_of_Measure: degrees Celsius
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_LASS_Data_YukonTanana_AK_Todd.csv
Entity_Type_Definition:
Table with zircon LASS data, reporting the concentration of uranium (U), thorium (Th) measured in individual grains, isotopic ratios of lead (Pb) uranium, and thorium, and the age of each grain interpreted from the isotopic ratios. This table also reports hafnium isotope ratios and concentrations of selected trace elements measured in the same grains. This table contains 5,801 records and is presented in comma separated value (.csv) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Index
Attribute_Definition:
Numeric identifier used for sorting purposes within this table only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 5801
Attribute:
Attribute_Label: Sample
Attribute_Definition:
Sample number as collected in the field; USGS and/or DGGS identifier.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Sample identifier; most labels consisting of the last two digits of the year collected, an abbreviation unique to the sample collector, and a station number, and possible alphanumeric suffix to distinguish samples from a given station. Extracted core samples are generally presented in a hyphen-separated format with a one to three letter alphanumeric identifier, two-digit year of collection, drill hole or leg number, and two numbers representing the distance measured beneath ground from the drill collar. All sample identifiers correspond to field 'Sample' in the table "geology_LASS_SampleSummary_YukonTanana_AK_Todd.csv" included with this data package.
Attribute:
Attribute_Label: Mount
Attribute_Definition:
Internal laboratory alphanumeric identifier for a specific sample mount, or "[TS]" for in-situ analyses of grains identified from polished thin sections.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field typically consist of three letter initials followed by a one- to three-digit number, denoting a specific sample mount. A value of "[TS]" indicates a polished thin section mount of the sample was analyzed.
Attribute:
Attribute_Label: Session_Run
Attribute_Definition:
Year and month of analytical session, and Run sequence within that session, when analysis was conducted.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this data set are a concatenation of the calendar year followed by a "/", the number associated with the calendar month, a two-digit number indicating the procedural sequence during the month indicated, the word "_RUN_", and a two-digit number or the letters "TS".
Attribute:
Attribute_Label: Timestamp
Attribute_Definition:
Concatenation of date and time of analysis for individual analysis spot.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this data set indicate date of the sample run in year, month, and day format, followed by a "_" and the local time the run proceeded in hour:minute:second format.
Attribute:
Attribute_Label: Spot_ID
Attribute_Definition:
Internal ID number of individual analysis location, generally the sample name or other laboratory identifier followed by a number for each individual grain.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set are a concatenation of parts of the field 'Sample' or other laboratory identifier, a dash or underscore, and an alphanumeric that indicates a unique location during the procedure.
Attribute:
Attribute_Label: Spot_Size_um
Attribute_Definition: Laser spot size during analyses, in micrometers (um).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 10
Range_Domain_Maximum: 65
Attribute_Units_of_Measure: (um) micrometers
Attribute:
Attribute_Label: Laser_Run_Conditions
Attribute_Definition:
Laser run conditions during analysis; repetition rate (Hz), fluence (%) and output (mJ). Blank cells may be present, indicating
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The attributes in this field are a concatenation of the frequency of the laser in Hz (cycles per second), power setting of the laser in % (percent), and output power setting of the laser in mJ (milliJoules).
Attribute:
Attribute_Label: Method
Attribute_Definition:
Analytical configuration used; "LASS" short for laser-ablation split-stream, indicates simultaneous quadrupole inductively coupled plasma spectrometer (Q-ICPMS) and multi-collector inductively coupled plasma spectrometer (MC-ICP-MS) analyses, measuring U-Th-Pb and trace elements on Q-ICPMS and Hf isotopes on MC-ICP-MS. "LA-ICP-MS" indicates Hf isotopes on MC-ICP-MS only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS
Enumerated_Domain_Value_Definition: Laser-ablation split-stream analytical configuration
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS (UPb on MC)
Enumerated_Domain_Value_Definition:
Laser-ablation split-stream analytical configuration for Uranium-Lead
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-MC-ICPMS (Hf on MC)
Enumerated_Domain_Value_Definition:
Laser-ablation multiple-collection inductively coupled plasma mass spectrometer analytical configuration, for Hf isotopes on MC-ICP-MS only.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-MC-ICPMS (UPb on MC)
Enumerated_Domain_Value_Definition:
Laser-ablation multiple-collection inductively coupled plasma mass spectrometer analytical configuration for Uranium-Lead
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: U_Pb_x_from_wtmn
Attribute_Definition:
Grains with discordant ages (generally <0.80 or >1.05 concordance; tolerances adjusted to <0.70 and >1.10 for smallest sample populations), calculated analytical age uncertainty in excess of 5%, or U/Th ratios indicating metamorphic origin, or grains interpreted as inherited, that are omitted from calculated weighted mean ages. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Hf_x_from_wtmn
Attribute_Definition:
Grains omitted from calculation of Hf isotope characterization for zircon populations. These include all grains excluded from calculated weighted mean ages, plus those with uncertainty in excess of 5%, or obvious outliers, the latter of which are typically associated with particularly small grain to spot size ratios. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: TE_x_from_median
Attribute_Definition:
Grains omitted from calculation of median trace element composition for zircon populations. These include all grains excluded from weighted mean and Hf isotopes, and zircon grains suspected of containing inclusions imparting non-zircon signal on integration of measured trace elements. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Comment_exclude
Attribute_Definition:
Shorthand description for why a grain was considered not permissible for deriving representative values for any one of the three datasets (U/Pb age, Hf isotope, trace elements); for more details see the document: "Supplemental_Info_Analytical_Methods_UCSB_LASS.pdf", included with this data package.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set are general remarks denoting rationale for exclusion. This is a free text field.
Attribute:
Attribute_Label: U_ppm
Attribute_Definition:
The concentration of uranium (U), in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 17
Range_Domain_Maximum: 43200
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Th_ppm
Attribute_Definition:
The concentration of thorium (Th), in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 33500
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: 207Pb_235U_ratio
Attribute_Definition: The ratio of 207Pb to 235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0400
Range_Domain_Maximum: 2410.0000
Attribute:
Attribute_Label: 207Pb_235U_ratio_2sigma
Attribute_Definition:
2-sigma (absolute uncertainty) on the ratio of 207Pb to 235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0010
Range_Domain_Maximum: 821.4150
Attribute:
Attribute_Label: 206Pb_238U_ratio
Attribute_Definition: The ratio of 206Pb to 238U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0054
Range_Domain_Maximum: 21.6000
Attribute:
Attribute_Label: 206Pb_238U_ratio_2sigma
Attribute_Definition:
2-sigma (absolute uncertainty) on the ratio of 206Pb to 238U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0002
Range_Domain_Maximum: 7.5124
Attribute:
Attribute_Label: rho_6_38vs7_35
Attribute_Definition:
Error correlation coefficient between 206Pb/238U and 207Pb/235U, for generating concordia plot. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -0.81
Range_Domain_Maximum: 1.00
Attribute:
Attribute_Label: 238U_206Pb_ratio
Attribute_Definition: The ratio of 238U to 206Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.050
Range_Domain_Maximum: 182.000
Attribute:
Attribute_Label: 238U_206Pb_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) on the ratio of 238U to 206Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.020
Range_Domain_Maximum: 38.470
Attribute:
Attribute_Label: 207Pb_206Pb_ratio
Attribute_Definition: The ratio of 207Pb to 206Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.04130
Range_Domain_Maximum: 0.81200
Attribute:
Attribute_Label: 207Pb_206Pb_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) on the ratio of 207Pb to 206Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00100
Range_Domain_Maximum: 0.20010
Attribute:
Attribute_Label: rho_38_6vs7_6
Attribute_Definition:
Error correlation coefficient between 238U/206Pb and 207Pb/206Pb, for generating concordia plot. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -1.00
Range_Domain_Maximum: 0.96
Attribute:
Attribute_Label: 208Pb_232Th_ratio
Attribute_Definition: The ratio of 208Pb to 232Th. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0002
Range_Domain_Maximum: 8.1000
Attribute:
Attribute_Label: 208Pb_232Th_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) on the ratio of 208Pb to 232Th. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0001
Range_Domain_Maximum: 1.3101
Attribute:
Attribute_Label: 206Pb_208Pb_ratio
Attribute_Definition: The ratio of 206Pb to 208Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.31
Range_Domain_Maximum: 980.00
Attribute:
Attribute_Label: 206Pb_208Pb_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for the ratio of 206Pb to 208Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 170.90
Attribute:
Attribute_Label: 207Pb_235Pb_Age_Ma
Attribute_Definition: Age (Ma) calculated from 207Pb/235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 39.8
Range_Domain_Maximum: 7907.6
Attribute:
Attribute_Label: 207Pb_235Pb_Age_Ma_2sigma
Attribute_Definition:
2-sigma (uncertainty) in the 207Pb/235U age (Ma). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.00
Range_Domain_Maximum: 3322.4
Attribute:
Attribute_Label: 206Pb_238U_Age_Ma
Attribute_Definition: Age (Ma) calculated from 206Pb/238U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 35.3
Range_Domain_Maximum: 19626.3
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_Age_Ma_2sigma
Attribute_Definition:
The 2-sigma (uncertainty) in the 206Pb/238U age (Ma). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.0
Range_Domain_Maximum: 6826.0
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_Age_Ma
Attribute_Definition: Age (Ma) calculated from 207Pb/206Pb. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -269.0
Range_Domain_Maximum: 4942.9
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_Age_Ma_2sigma
Attribute_Definition:
The 2-sigma (uncertainty) in the 207Pb/206Pb age (Ma). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -48.9
Range_Domain_Maximum: 2155.6
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: Concordance
Attribute_Definition:
Ratio of age determined using 206Pb/238U versus age determined using 207Pb/235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 2.48
Attribute:
Attribute_Label: Age_Type
Attribute_Definition:
Method used to calculate the values for each individual analysis that yielded a valid result. Blank cells indicate no age type determination was made.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: age7corr
Enumerated_Domain_Value_Definition: 207Pb-corrected 206Pb/238U age (Ma), for U-Pb ages < 1.4Ga
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: agepb76
Enumerated_Domain_Value_Definition: 207Pb/206Pb age (Ma) for U-Pb ages >1.4Ga.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Preferred_Age
Attribute_Definition:
Preferred grain age for calculation of sample age (in millions of years, or Ma), selected from one of two following fields containing corrected ages for each grain: 207Pb-corrected 206Pb/238U age (Ma) for U-Pb ages < 1.4Ga; For U-Pb ages > 1.4Ga, or 207Pb/206Pb for U-Pb ages >1.4Ga.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 35.0
Range_Domain_Maximum: 4942.9
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: Preferred_Age_2sigma
Attribute_Definition:
Uncertainty (2-sigma) on preferred grain age (in millions of years, or Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.9
Range_Domain_Maximum: 899.3
Attribute_Units_of_Measure: (Ma) Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 176Hf_177Hf_ratio
Attribute_Definition:
The ratio of 176Hf to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.280753
Range_Domain_Maximum: 0.283233
Attribute:
Attribute_Label: 176Hf_177Hf_ratio_2sigma
Attribute_Definition:
Uncertainty (2-sigma) values for the ratio of 176Hf to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000022
Range_Domain_Maximum: 0.000300
Attribute:
Attribute_Label: 176Lu_177Hf_ratio
Attribute_Definition:
The ratio of 176Lu to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000034
Range_Domain_Maximum: 0.015920
Attribute:
Attribute_Label: 176Lu_177Hf_ratio_2sigma
Attribute_Definition:
Uncertainty (2-sigma) values for the ratio of 176Lu to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000000
Range_Domain_Maximum: 0.000750
Attribute:
Attribute_Label: 178Hf_177Hf_ratio
Attribute_Definition:
The ratio of 178Hf to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.46696
Range_Domain_Maximum: 1.46795
Attribute:
Attribute_Label: 178Hf_177Hf_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for the ratio of 178Hf to 177Hf. Blank cells are present, indicating no data was measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00006
Range_Domain_Maximum: 0.00041
Attribute:
Attribute_Label: eHf
Attribute_Definition:
Epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -71.40
Range_Domain_Maximum: 16.30
Attribute:
Attribute_Label: eHf_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.78
Range_Domain_Maximum: 10.61
Attribute:
Attribute_Label: 176Hf_177Hf_T
Attribute_Definition:
Age-corrected 176Hf/177Hf ratio, assuming Lutetium-176 decay constant of 1.86x10e-11 (Scherer et al., 2001); not calculated if discordant or no same-grain age measurement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.280719
Range_Domain_Maximum: 0.283228
Attribute:
Attribute_Label: eHf_T
Attribute_Definition:
Age-corrected epsilon Hf value assuming chondritic 176Hf/177Hf ratio of 0.282772 and 176Lu/177Hf ratio of 0.0332 (Blichert-Toft and Albarede, 1997); not calculated if discordant or no same-grain age measurement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -37.30
Range_Domain_Maximum: 27.99
Attribute:
Attribute_Label: T_DM_Hf
Attribute_Definition:
Model age in billions of years before present (Ga) assuming a present-day depleted mantle 176Lu/177Hf and 176Hf/177Hf of 0.0384 and 0.28325 (Griffin et al., 2000). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 3.43
Attribute_Units_of_Measure: Giga-annum, or billions of years before present
Attribute:
Attribute_Label: Zr_ppm
Attribute_Definition:
Zirconium (Zr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.37E+05
Range_Domain_Maximum: 8.30E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Zr_cps
Attribute_Definition:
Raw, uncalibrated signal intensity of zirconium (Zr), measured in counts per second (cps). Provided for informational purposes only. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.59E+07
Range_Domain_Maximum: 7.61E+08
Attribute_Units_of_Measure: cps (counts per second)
Attribute:
Attribute_Label: Si_ppm
Attribute_Definition:
Silica (Si) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.18E+05
Range_Domain_Maximum: 2.20E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Si_cps
Attribute_Definition:
Raw, uncalibrated signal intensity of silicon (Si), measured in counts per second (cps). Provided for informational purposes only. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.62E+04
Range_Domain_Maximum: 1.73E+08
Attribute_Units_of_Measure: cps (counts per second)
Attribute:
Attribute_Label: P_ppm
Attribute_Definition:
Phosphorous (P) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 13.80
Range_Domain_Maximum: 128000.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ti_ppm
Attribute_Definition:
Titanium (Ti) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.10
Range_Domain_Maximum: 39600.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: V_ppm
Attribute_Definition:
Vanadium (V) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 36000.00
Attribute_Units_of_Measure: ppm (parts per million
Attribute:
Attribute_Label: Sr_ppm
Attribute_Definition:
Strontium (Sr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 1340.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Y_ppm
Attribute_Definition:
Yttrium (Y) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 37
Range_Domain_Maximum: 42500
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Nb_ppm
Attribute_Definition:
Niobium (Nb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.33
Range_Domain_Maximum: 1060.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: La_ppm
Attribute_Definition:
Lanthanum (La) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0002
Range_Domain_Maximum: 25000.0000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ce_ppm
Attribute_Definition:
Cerium (Ce) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 12400.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Pr_ppm
Attribute_Definition:
Praseodymium (Pr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0004
Range_Domain_Maximum: 3610.0000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Nd_ppm
Attribute_Definition:
Neodymium (Nd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.003
Range_Domain_Maximum: 10830.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Sm_ppm
Attribute_Definition:
Samarium (Sm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.009
Range_Domain_Maximum: 2109.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Eu_ppm
Attribute_Definition:
Europium (Eu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 2630.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Gd_ppm
Attribute_Definition:
Gadolinium (Gd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.1
Range_Domain_Maximum: 5290.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Tb_ppm
Attribute_Definition:
Terbium (Tb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.1
Range_Domain_Maximum: 1150.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Dy_ppm
Attribute_Definition:
Dysprosium (Dy) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.5
Range_Domain_Maximum: 7580.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ho_ppm
Attribute_Definition:
Holmium (Ho) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.2
Range_Domain_Maximum: 1690.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Er_ppm
Attribute_Definition:
Erbium (Er) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 6
Range_Domain_Maximum: 5090
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Tm_ppm
Attribute_Definition:
Thulium (Tm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.1
Range_Domain_Maximum: 1340.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Yb_ppm
Attribute_Definition:
Ytterbium (Yb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9
Range_Domain_Maximum: 12400
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Lu_ppm
Attribute_Definition:
Lutetium (Lu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.3
Range_Domain_Maximum: 1930.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Hf_ppm
Attribute_Definition:
Hafnium (Hf) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1780
Range_Domain_Maximum: 51100
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ta_ppm
Attribute_Definition:
Tantalum (Ta) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.079
Range_Domain_Maximum: 347.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Pb_ppm
Attribute_Definition:
Lead (Pb) concentration, in parts per million (ppm), approximated based on 208Pb concentration. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.6
Range_Domain_Maximum: 1438.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: T_C
Attribute_Definition:
Ti-in-zircon thermometer (degrees C), after Ferry and Watson (2007), assuming SiO2 and TiO2 of 0.7. Blank cells are present, indicating no calculation for grains excluded from main populations.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 443
Range_Domain_Maximum: 3017
Attribute_Units_of_Measure: degrees Celsius
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 format; supplemental Analytical Methods files in PDF format; and FGDC metadata 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/P9O1DMIE
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20231114
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 Nov 14 18:38:10 2023