U-Pb Isotopic Data and Ages of Zircon from the Manzano Mountains, New Mexico

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Jones III, J.V. (ORCID: 0000-0002-6602-5935)
Publication_Date: 20201027
Title:
U-Pb Isotopic Data and Ages of Zircon from the Manzano Mountains, New Mexico
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested citation: Jones III, J.V., 2020, U-Pb isotopic data and ages of zircon from the Manzano Mountains, New Mexico: U.S. Geological Survey data release, https://doi.org/10.5066/P9U0P2ZY
Online_Linkage: https://doi.org/10.5066/P9U0P2ZY
Larger_Work_Citation:
Citation_Information:
Originator: Mark E. Holland
Originator: Tyler A. Grambling
Originator: Karl E. Karlstrom
Originator: James V. Jones (ORCID: 0000-0002-6602-5935)
Originator: Kimberly N. Nagotko
Originator: Christopher G. Daniel
Publication_Date: 202009
Title:
Geochronologic and Hf-isotope framework of Proterozoic rocks from central New Mexico, USA: Formation of the Mazatzal crustal province in an extended continental margin arc
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Precambrian Research
Issue_Identification: Vol. 347, Article 105820
Publication_Information:
Publication_Place: Online
Publisher: Elsevier
Other_Citation_Details:
Suggested citation: Holland, et al., 2020: Geochronologic and Hf-isotope framework of Proterozoic rocks from central New Mexico, USA: Formation of the Mazatzal crustal province in an extended continental margin arc: Precambrian Research, vol. 347, article 105820
Online_Linkage: https://doi.org/10.1016/j.precamres.2020.105820
Description:
Abstract:
This data set contains tables containing uranium-lead (U-Pb) isotopic data and the crystallization age of zircon from a metamorphic rock from the Manzano Mountains, New Mexico, collected in 2005. The bulk sample was processed into concentrated mineral separates of zircon at the University of Texas at Austin and analyzed by U.S. Geological Survey (USGS) research scientists at the Stanford-USGS Sensitive High Resolution Ion Microprobe with Reverse-Geometry (SHRIMP-RG) at Stanford University. The data table (geology_SHRIMPRGData_NM_Jones.csv) accompanying this data release reports the isotopic composition of uranium (U) and thorium (Th) measured in each grain, ratios of two isotopes of lead (207Pb and 206Pb) and two isotopes of uranium (235U and 238U), the age of each grain, and concentrations of selected trace elements measured in each grain. A second table (geology_sampleSummary_NM_Jones.csv) reports the sample location, rock characteristics, and interpreted age. Additionally, a third data table (geology_dataDictionary_NM_Jones.csv) is provided as a reference guide for the user.
Purpose:
U-Pb zircon dates from metamorphic rocks aid in the interpretation of the age of original formation (e.g. crystallization age). These data are used to understand the geologic history of the Manzano Mountains and surrounding regions of central New Mexico. Detailed interpretations of the data and a discussion of the results of the study can be found in the journal Precambrian Research (Holland et al., 2020).
Supplemental_Information:
The geochronological data provided in this data release contain trailing zeros. If the CSV files are opened directly in Microsoft Excel, data values may be truncated. To ensure the appropriate number of significant figures are displayed when using Excel, please open a blank workbook and import the data from the CSV file as text (no data type detection).
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2020
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -106.60
East_Bounding_Coordinate: -106.50
North_Bounding_Coordinate: 34.50
South_Bounding_Coordinate: 34.40
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geology
Theme_Keyword: geochronology
Theme_Keyword: uranium-lead analysis
Theme_Keyword: metamorphic rocks
Theme:
Theme_Keyword_Thesaurus: GeoRef Thesaurus
Theme_Keyword: SHRIMP data
Theme_Keyword: U/Pb
Theme_Keyword: trace elements
Theme_Keyword: isotope
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC324
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Manzano Mountains
Place_Keyword: New Mexico
Access_Constraints:
None. Please see 'Distribution Info' for further access details.
Use_Constraints:
None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Person: James V. Jones III
Contact_Position: Research Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4626
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs,gov
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Zircon crystals were run with zircon reference materials (TEM2 and MAD559). The reference materials were analyzed until isotopic fractionation was stable and the variance in the measured 206Pb/238U and 207Pb/206Pb ratios was at or near 1 percent. Reference materials were subsequently analyzed together with unknowns at a regular interval to monitor fractionation throughout the analytical session. All measured isotopic ratios are reported with associated analytical uncertainty at the 1 sigma range.
Logical_Consistency_Report: No unexpected values are found in these data.
Completeness_Report: This data set is complete; no data were omitted.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal position was measured using hand-held GPS units with positional accuracy of 3 meters or less.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stanford-USGS SHRIMP-RG Laboratory
Publication_Date: 2020
Title:
U-Pb geochronology and trace element analytical methods using Stanford-USGS SHRIMP-RG
Geospatial_Data_Presentation_Form: publication
Publication_Information:
Publication_Place: Palo Alto, California
Publisher: Stanford-USGS SHRIMP-RG laboratory
Other_Citation_Details:
This is a supplemental document included in this data release. The file name is Supplemental_Info_Analytical_Methods_StanfordUSGSSHRIMPRG.pdf.
Type_of_Source_Media: pdf file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2020
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: SHRIMP-RG Methods
Source_Contribution:
Provides detailed descriptions of laboratory methods and data modeling for zircon U-Pb geochronology
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 back-scattered electron (BSE) imaging on a JEOL 5600 SEM to identify internal grain zonation patterns and to identify any inclusions or other features such as cracks to be avoided during analysis. Zircon U-Pb ages were obtained with the Stanford-U.S. Geological (USGS) Sensitive High Resolution Ion Microprobe with Reverse-Geometry (SHRIMP-RG) at Stanford University; details of the analytical processes are outlined in the Supplemental_Info_Analytical_Methods_StanfordUSGSSHRIMPRG.pdf file included with this data release. Excel and the add-in programs Isoplot 3.76 and Squid 2.51 (Ludwig, 2003, Ludwig, 2012) were used for data reduction, following the methods described by Williams (1997) and Ireland and Williams (2003).
Process_Date: 202001
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 (NAD 83)
Ellipsoid_Name: Geodetic Reference System 1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_SHRIMPRGData_NM_Jones.csv
Entity_Type_Definition:
Table of zircon SHRIMP-RG data, reporting the isotopic concentration of uranium (U), lead (Pb), and thorium (Th) measured in individual grains, isotopic ratios of Pb and U, and the age of each grain calculated from the isotope ratios. The table also reports concentrations of selected trace elements measured in the same grains. The table contains 24 records and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition:
Sample number attributed when collected in the field. The value is unique for this sample but is repeated many times in this table because many individual grains from this sample were analyzed. Descriptive and locational information about the sample is included in table geology_sampleSummary_NM_Jones.csv, and may be linked through attribute Sample.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier, includes a number denoting the last digits of the year collected, an abbreviation identifying the collector, a number and suffix.
Attribute:
Attribute_Label: Mineral
Attribute_Definition: Mineral type analyzed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: The only mineral analyzed in this data set is zircon.
Attribute:
Attribute_Label: Mount
Attribute_Definition: Internal laboratory ID number for sample mount.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Alphanumeric code assigned by the laboratory.
Attribute:
Attribute_Label: Standard
Attribute_Definition: Age reference used on the mount.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: TEM2
Enumerated_Domain_Value_Definition: Middledale gabbroic diorite zircon standard
Enumerated_Domain_Value_Definition_Source:
Black, L.P., Kamo, S.L., Allen, C.M., Davis, D.W., Aleinikoff, J.N., Valley, J.W., Mundil, R., Campbell, I.H., Korsch, R.J., Williams, I.S., and Foudoulis, C. 2004, Improved 206Pb/238U microprobe geochronology by the monitoring of trace-element-related matrix effect; SHRIMP, ID-TIMS, ELA-ICP-IMS and oxygen isotope documentation for a series of zircon standards: Chemical Geology, 205, p. 115-140, https://doi.org/10.1016/j.chemgeo.2004.01.003.
Attribute:
Attribute_Label: Standard_Age
Attribute_Definition:
Published age of age reference material for data reduction, in millions of years (Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: The assumed age for the standard is: TEM2 (416.8 Ma)
Attribute:
Attribute_Label: Conc_Std
Attribute_Definition:
Concentration standard used to calibrate trace element concentrations in unknowns.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MAD559
Enumerated_Domain_Value_Definition: zircon reference material
Enumerated_Domain_Value_Definition_Source:
Coble, M.A., Vazquez, J.A., Barth, A.P., Wooden, J., Burns, D., Kylander-Clark, A., Jackson, S., and Vennari, C.E., 2018, Trace element characterization of MAD-559 zircon reference material for ion microprobe analysis: Geostandards and Geoanalytical Research, v. 42, p. 481–497, https://doi.org/10.1111/ggr.12238.
Attribute:
Attribute_Label: Analysis_Spot
Attribute_Definition: Internal ID number of individual analysis spot on this Mount.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Alphanumeric code assigned by analyst. In general, the first number after the sample name indicates the unique grain from an individual sample. The second number indicates the unique spot for each individual grain.
Attribute:
Attribute_Label: AnalysisSpot_Mount
Attribute_Definition: Concatenation of Analysis_Spot and Mount attributes.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Concatenation of Analysis_Spot and and Mount attributes separated by an underscore (_).
Attribute:
Attribute_Label: Analysis_Date_Time
Attribute_Definition: The calendar date and time of analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Data is formatted yyyy-mm-dd, hh:mm
Attribute:
Attribute_Label: U_conc_ppm
Attribute_Definition: Uranium concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 83
Range_Domain_Maximum: 481
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Th_conc_ppm
Attribute_Definition: Thorium concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 46
Range_Domain_Maximum: 646
Attribute_Units_of_Measure: parts per million (ppm).
Attribute:
Attribute_Label: comm_206Pb_perc
Attribute_Definition: 207Pb corrected common 206Pb, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 20
Range_Domain_Maximum: 110
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 238U_206Pb_Ratio
Attribute_Definition: Total ratio of 238U to 206Pb
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.34
Range_Domain_Maximum: 4.23
Attribute:
Attribute_Label: 238U_206Pb_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on total ratio of 238U to 206Pb, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.45
Range_Domain_Maximum: 2.78
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 207Pb_206Pb_Ratio
Attribute_Definition: Total ratio of 207Pb to 206Pb
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0954
Range_Domain_Maximum: 0.1030
Attribute:
Attribute_Label: 207Pb_206Pb_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on total ratio of 207Pb to 206Pb, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.42
Range_Domain_Maximum: 3.26
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 204Pbcorr_238U_206Pb_Ratio
Attribute_Definition: 204Pb-corrected ratio of 238U to 206Pb
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.3444
Range_Domain_Maximum: 4.2520
Attribute:
Attribute_Label: 204Pbcorr_238U_206Pb_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on 204Pb-corrected ratio of 238U to 206Pb, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.45
Range_Domain_Maximum: 2.78
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 204Pbcorr_207Pb_206Pb_Ratio
Attribute_Definition: 204Pb-corrected ratio of 207Pb to 206Pb
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0944
Range_Domain_Maximum: 0.1006
Attribute:
Attribute_Label: 204Pbcorr_207Pb_206Pb_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on 204Pb-corrected ratio of 207Pb to 206Pb, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.44
Range_Domain_Maximum: 3.74
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 204Pbcorr_207Pb_235U_Ratio
Attribute_Definition: 204Pb-corrected ratio of 207Pb to 235U
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.1376
Range_Domain_Maximum: 3.9696
Attribute:
Attribute_Label: 204Pbcorr_207Pb_235U_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on 204Pb-corrected ratio of 207Pb to 235U, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.55
Range_Domain_Maximum: 4.08
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: 204Pbcorr_206Pb_238U_Ratio
Attribute_Definition: 204Pb-corrected ratio of 206Pb to 238U
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2351
Range_Domain_Maximum: 0.2990
Attribute:
Attribute_Label: 204Pbcorr_206Pb_238U_Ratio_Unc_1sig_perc
Attribute_Definition:
Uncertainty (1-sigma) on 204Pb-corrected ratio of 206Pb to 238U, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.45
Range_Domain_Maximum: 2.78
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: Error_Correlation
Attribute_Definition: Error correlation of 207Pb/235U and 206Pb/238U ratios.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.40
Range_Domain_Maximum: 0.97
Attribute:
Attribute_Label: 207Pbcorr_206Pb_238U_Age
Attribute_Definition:
207Pb-corrected 206Pb/238U age, in millions of years before present (mega-annum)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1346.9
Range_Domain_Maximum: 1700.0
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: 207Pbcorr_206Pb_238U_Age_Unc_1sig
Attribute_Definition:
Uncertainty (1-sigma) on 207Pb-corrected 206Pb/238U age, in millions of years
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 20.9
Range_Domain_Maximum: 43.5
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: 204Pbcorr_207Pb_206Pb_Age
Attribute_Definition: 204Pb-corrected 207Pb/206Pb age, in millions of years
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1517.1
Range_Domain_Maximum: 1636.8
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: 204Pbcorr_207Pb_206Pb_Age_Unc_1sig
Attribute_Definition:
Uncertainty (1-sigma) on 204Pb-corrected 207Pb/206Pb age, in millions of years
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 8.2
Range_Domain_Maximum: 70.2
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: Preferred_SHRIMP_Age
Attribute_Definition:
Preferred grain age for calculation of sample age (in millions of years) selected from one of the two following fields containing calculated ages: 207Pbcorr_206Pb_238U_Age or 204Pbcorr_207Pb_206Pb_Age.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1517.1
Range_Domain_Maximum: 1636.8
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: Preferred_SHRIMP_Age_Unc_1sig
Attribute_Definition:
Uncertainty (1-sigma) in millions of years on preferred grain age.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 8.2
Range_Domain_Maximum: 70.2
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: Preferred_SHRIMP_Age_Type
Attribute_Definition:
Method used to calculate the values in Preferred_SHRIMP_Age field for each individual analysis that yielded a valid result.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The only attribute used in this data set is 204Pbcorr_207Pb_206Pb_Age.
Attribute:
Attribute_Label: Interpreted_Age_Included
Attribute_Definition:
Indication of whether or not analysis was used in the calculation field UPb_Age_Ma in table geology_sampleSummary_NM_Jones.csv
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: N
Enumerated_Domain_Value_Definition: No; indicates analysis was not used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Y
Enumerated_Domain_Value_Definition: Yes, indicates analysis was used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Percent_Discordant
Attribute_Definition:
Discordance of 206Pb/238U age versus 207Pb/206Pb age, in percent.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -9.73
Range_Domain_Maximum: 14.26
Attribute_Units_of_Measure: percent
Attribute:
Attribute_Label: Y_ppm
Attribute_Definition: Yttrium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 394.0
Range_Domain_Maximum: 2093.3
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: La_ppm
Attribute_Definition: Lanthanum concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 28.34
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Ce_ppm
Attribute_Definition: Cerium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9.15
Range_Domain_Maximum: 211.74
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Nd_ppm
Attribute_Definition: Neodymium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.43
Range_Domain_Maximum: 15.88
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Sm_ppm
Attribute_Definition: Samarium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.05
Range_Domain_Maximum: 11.29
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Eu_ppm
Attribute_Definition: Europium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.35
Range_Domain_Maximum: 4.41
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Gd_ppm
Attribute_Definition: Gadolinium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 8.0
Range_Domain_Maximum: 43.6
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Dy_ppm
Attribute_Definition: Dysprosium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.3
Range_Domain_Maximum: 186.6
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Er_ppm
Attribute_Definition: Erbium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 71.6
Range_Domain_Maximum: 375.3
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Yb_ppm
Attribute_Definition: Ytterbium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 166.9
Range_Domain_Maximum: 744.4
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Hf_ppm
Attribute_Definition: Hafnium concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 7453.1
Range_Domain_Maximum: 11005.8
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: 48Ti_ppm
Attribute_Definition: Titanium (from mass 48) concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.8
Range_Domain_Maximum: 25.8
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: 49Ti_ppm
Attribute_Definition: Titanium (from mass 49) concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.9
Range_Domain_Maximum: 28.5
Attribute_Units_of_Measure: parts per million (ppm)
Attribute:
Attribute_Label: Fe_ppm
Attribute_Definition: Iron concentration in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.9
Range_Domain_Maximum: 84.2
Attribute_Units_of_Measure: parts per million (ppm)
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_sampleSummary_NM_Jones.csv
Entity_Type_Definition:
Table with descriptive sample information, including location, rock description, and summary of geochronology analyses. This table contains 1 record and is presented in comma separated value (CSV) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Sample
Attribute_Definition:
Sample number assigned when sample was collected in the field. This attribute links to field Sample in geology_SHRIMPRGData_NM_Jones.csv.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique sample identifier, includes numbers denoting the two digit year collected, an abbreviation identifying the collector, and a number with a suffix.
Attribute:
Attribute_Label: Latitude
Attribute_Definition: Latitude given in decimal degrees; datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 34.4212
Range_Domain_Maximum: 34.4212
Attribute_Units_of_Measure: decimal degree
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Longitude
Attribute_Definition: Longitude given in decimal degrees; datum NAD83.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -106.5174
Range_Domain_Maximum: -106.5174
Attribute_Units_of_Measure: decimal degree
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Rock_Class
Attribute_Definition: Basic rock classification of the sample.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: The only attribute in this data set is metamorphic.
Attribute:
Attribute_Label: Rock_Type
Attribute_Definition: Sample rock type.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a free text field which includes a general rock description.
Attribute:
Attribute_Label: Rock_Comment
Attribute_Definition:
Additional sample description which may include a more detailed rock description, location, and/or geologic map unit.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a free text field that includes additional sample description which may include a more detailed rock description, location, and/or geologic map unit.
Attribute:
Attribute_Label: Analysis_Type
Attribute_Definition: Indicates type of geochronologic analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: U-Pb zircon
Enumerated_Domain_Value_Definition: Uranium-lead analysis on zircon
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Analysis_Lab
Attribute_Definition: Laboratory or contractor responsible for the analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Stanford-USGS SHRIMP-RG
Enumerated_Domain_Value_Definition:
Stanford University-USGS Sensitive High Resolution Ion Microprobe with Reverse Geometry
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Analysis_Method
Attribute_Definition: Laboratory equipment and methodology used to collect data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SHRIMP U-Pb
Enumerated_Domain_Value_Definition: Sensitive high resolution ion microprobe with reverse geometry
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: UPb_Age_N_Grains_Total
Attribute_Definition: Total number of grains analyzed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 24
Range_Domain_Maximum: 24
Attribute:
Attribute_Label: UPb_Age_Ma
Attribute_Definition:
Weighted average age calculated for sample in millions of years.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1588
Range_Domain_Maximum: 1588
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: UPb_Age_Unc_Ma
Attribute_Definition:
Uncertainty (2-sigma) of weighted average age calculated for sample, in millions of years.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 7
Range_Domain_Maximum: 7
Attribute_Units_of_Measure: millions of years
Attribute:
Attribute_Label: UPb_Age_Method
Attribute_Definition: Method used to calculate the value in UPb_Age.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The only attribute in this data set is 'weighted average of 206Pb/238U age'.
Attribute:
Attribute_Label: UPb_Age_N_Grains
Attribute_Definition: Number of analyses used to calculate the value in UPb_Age_Ma.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 23
Range_Domain_Maximum: 23
Attribute:
Attribute_Label: UPb_Age_MSWD
Attribute_Definition:
Mean square of weighted deviates for calculated value in UPb_Age_Ma.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.56
Range_Domain_Maximum: 1.56
Attribute:
Attribute_Label: UPb_Age_Interpretation
Attribute_Definition: Geological significance of the interpreted age.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: crystallization
Enumerated_Domain_Value_Definition:
Indicates growth of the dated mineral grains during original formation of the rock.
Enumerated_Domain_Value_Definition_Source: Author defined
Detailed_Description:
Entity_Type:
Entity_Type_Label: geology_dataDictionary_NM_Jones.csv
Entity_Type_Definition:
Table listing the name of all fields in each table, with a brief description of the field and the data units, if applicable.
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:
Unrepresentable_Domain:
The data tables in this data set include geology_SHRIMPRGData_NM_Jones.csv, and geology_sampleSummary_NM_Jones.csv.
Attribute:
Attribute_Label: Field
Attribute_Definition: Field name found in data table listed in field Table
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The field names are single words or concatenated abbreviations that describe the contents of the field.
Attribute:
Attribute_Label: Description
Attribute_Definition: Brief description of the contents of the field
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Brief description of the contents of the field.
Attribute:
Attribute_Label: Units
Attribute_Definition: The unit of measurement for applicable data fields
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: n/a
Enumerated_Domain_Value_Definition: not applicable
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: %
Enumerated_Domain_Value_Definition: percentage
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: degree
Enumerated_Domain_Value_Definition: unit of angular measure
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
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
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: 99508-4626
Country: United States
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Resource_Description: Authoritative source for the 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 (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
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 and FGDC metadata in XML and HTML formats., and supplementary information about laboratory methods in PDF.
File_Decompression_Technique:
Compression applied by the 7-Zip utility using default compression (5). The file can be decompressed and unpacked by open source or commercially available unzip tools.
Transfer_Size: 0.2
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9U0P2ZY
Fees: None
Technical_Prerequisites:
The geochronological data provided in this data release contain trailing zeros. If the CSV files are opened directly in Microsoft Excel, data values may be truncated. To ensure the appropriate number of significant figures are displayed when using Excel, please open a blank workbook and import the data from the CSV file as text (no data type detection).
Metadata_Reference_Information:
Metadata_Date: 20201026
Metadata_Review_Date: 20201026
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Person: Alan Pongratz
Contact_Address:
Address_Type: mailing and physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4626
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.50 on Mon Oct 26 18:55:21 2020