Re-Os Geochronologic Data for Porphyry Deposits in the Yukon-Tanana Upland, Eastern Alaska

Identification_Information:

Citation:

Citation_Information:

Originator: Kreiner, Douglas C. (ORCID: 0000-0002-4405-1403)
Originator: Graham, Garth E. (ORCID: 0000-0003-0657-0365)
Originator: Creaser, Robert A. (ORCID: 0000-0002-7672-035X)
Originator: Selby, D.
Publication_Date: 20220222
Title:

Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested Citation: Kreiner, D.C., Graham, G.E., Creaser, R.A., Selby, D., 2022, Re-Os geochronologic data for porphyry deposits in the Yukon-Tanana upland, eastern Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P972SF7V

Online_Linkage: https://doi.org/10.5066/P972SF7V
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:

Rhenium-osmium (Re-Os) geochronology of molybdenite provides a tool to directly date mineralizing events in hydrothermal systems. In the Yukon-Tanana upland of eastern Alaska, numerous molybdenite-bearing porphyry occurrences are recognized. The deposits are related to middle and Late Cretaceous granitoids (Kreiner and others, 2019; 2020). Some of the porphyry districts have multiple superimposed igneous events with relative timing relationships observed through detailed mapping and core logging. These timing relationships indicate multiple pulses of copper and molybdenite mineralization. This study dated molybdenite-bearing veins from porphyry occurrences across eastern Alaska. This includes five samples from the Taurus district, which attempted to directly date mineralization in an effort to understand which of the seven magmatic pulses was the main cause of mineralization.

Purpose:

The purpose of the data release is to provide analytical data used to support current and ongoing research in the region to better characterize the age of mineralization and its relationship to magma suites through time.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2022

Currentness_Reference: Observed

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -143.9
East_Bounding_Coordinate: -141.2
North_Bounding_Coordinate: 64.3
South_Bounding_Coordinate: 63.5

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC438

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: GeoscientificInformation

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keyword Thesaurus
Theme_Keyword: Isotope ratios
Theme_Keyword: Isotopic age
Theme_Keyword: Igneous rock age determination

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Geology
Theme_Keyword: Geochronology
Theme_Keyword: Isotopic analysis
Theme_Keyword: Radiometric dating

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Porphyry
Theme_Keyword: Rhenium-osmium
Theme_Keyword: Re-Os
Theme_Keyword: Yukon-Tanana Upland

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Eagle
Place_Keyword: Tanacross

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_Set_Credit:

Samples analyzed by Robert A. Creaser at the University of Alberta, Canada and David Selby at the University of Durham, United Kingdom.

Cross_Reference:

Citation_Information:

Originator: Kreiner, D.C.
Originator: Holm-Denoma, C.
Originator: Pianowski, L.
Originator: Flood, Z.
Originator: Stephens, D.
Originator: Graham, G.E.
Originator: Vasquez, J.
Originator: Creaser, R.A.
Publication_Date: 2023
Title:

Geochronology and Mapping Constraints on the Time-Space Evolution of the Igneous and Hydrothermal Systems in the Taurus Cu-Mo District, Eastern Alaska

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Economic Geology
Issue_Identification: 118(4): 745–778

Publication_Information:

Publication_Place: online
Publisher: GeoScienceWorld

Other_Citation_Details:

Kreiner, D.C, Holm-Denoma, C., Pianowski, L., Flood, Z., Stephens, D., Graham, G.E., Vazquez, J., Creaser, R.A., 2023. Geochronology and mapping constraints on the time-space evolution of the igneous and hydrothermal systems in the Taurus Cu-Mo district, eastern Alaska. Economic Geology 118(4): 745–778 doi:10.5382/econgeo.4999

Online_Linkage: https://doi.org/10.5382/econgeo.4999

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

As noted in the Process Step, The Reference Material 8599 Henderson molybdenite (Markey et al., 2007) is routinely analyzed as a control sample, which yielded a running average Re-Os date as of 2017 (year of analysis) of 27.78 ± 0.06 Ma (n=18 Alberta) and 27.67 ± 0.08 Ma (n=22 Durham), indistinguishable from the Reference Age Value of 27.66 ± 0.01 Ma (Markey et al., 2007; Zimmerman et al., 2014). Re-Os model ages are calculated assuming a 187Re decay constant of 1.666e-11± 5.165×10−14 a−1 (Smoliar et al, 1996). For more detail, see the file: "README_ReOs_geochronologyData_yukonTanana_kreiner.pdf" included with this data package.

Logical_Consistency_Report:

Attribute values fall within expected ranges. 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:

Samples for this data set were collected from an area of the Yukon-Tanana Uplands area, with samples taken only from within the boundaries of the Eagle and Tanacross 1:250,000-scale quadrangles, Alaska.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Most coordinates were determined by handheld global positioning systems (GPS) in decimal degrees and are accurate to about 0.0001 degrees or about 20 feet. GPS data were collected in datum WGS84 (1984 World Geographic System datum), and for samples that were analyzed from previous sampling collections, conversion from datum NAD83 to datum WGS84 was provided using National Coordinate and Transformation Tool (NCAT) software https://geodesy.noaa.gov/NCAT

The positional accuracy of sample MOS75-1-378.1 is not known to the precision of the other samples. The latitude and longitude of the Mosquito prospect from the Alaska Resource Data File (ARDF) is listed as the latitude and longitude for this sample, and is provided only to two decimal places, or 0.01 degrees.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Markey, R.J.
Originator: Stein, H.J.
Originator: Hannah, J.L.
Originator: Zimmerman, A.
Originator: Selby, D.
Originator: Creaser, R.A.
Publication_Date: 2007
Title:

Standardizing Re-Os geochronology: A new molybdenite Reference Material (Henderson, USA) and the stoichiometry of Os salts

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Chemical Geology
Issue_Identification: 244(1-2):74-87

Publication_Information:

Publication_Place: online
Publisher: Elsevier

Other_Citation_Details:

Markey, R.J., Stein, H.J., Hannah, J.L., Zimmerman, A., Selby, D., and Creaser, R.A. 2007. Standardizing Re-Os geochronology: A new molybdenite Reference Material (Henderson, USA) and the stoichiometry of Os salts. Chemical Geology 244(1-2):74-87 doi:10.1016/j.chemgeo.2007.06.002

Online_Linkage: https://doi.org/10.1016/j.chemgeo.2007.06.002

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: Markey and others, 2007
Source_Contribution:

Provides information regarding Re-Os geochronology reference material standards.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Selby, D.
Originator: Creaser, R.A.
Publication_Date: 2004
Title:

Macroscale NTIMS and microscale LA-MC-ICP-MS Re-Os isotopic analysis of molybdenite: Testing spatial restrictions for reliable Re-Os age determinations, and implications for the decoupling of Re and Os within molybdenite

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geochimica et Cosmochimica Acta
Issue_Identification: 68(19):3897-3908

Publication_Information:

Publication_Place: online
Publisher: Elsevier

Other_Citation_Details:

Selby, D. and Creaser, R.A. 2004. Macroscale NTIMS and microscale LA-MC-ICP-MS Re-Os isotopic analysis of molybdenite: Testing spatial restrictions for reliable Re-Os age determinations, and implications for the decoupling of Re and Os within molybdenite. Geochimica et Cosmochimica Acta 68(19):3897-3908 doi:10.1016/j.gca.2004.03.022

Online_Linkage: https://doi.org/10.1016/j.gca.2004.03.022

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2004

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Selby and Creaser, 2004
Source_Contribution:

Provides evaluation of sample preparation and aliquant size on the accuracy and reproducibility of Re-Os ages in molybdenite samples.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Smoliar, M.I.
Originator: Walker, R.J.
Originator: Morgan, J.W.
Publication_Date: 1996
Title: Re-Os ages of group IIA, IIIA, IVA, IVB iron meteorites
Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Science
Issue_Identification: 271(5252):1099-1102

Publication_Information:

Publication_Place: online
Publisher: American Association for the Advancement of Science

Other_Citation_Details:

Smoliar, M.I., Walker, R.J., and Morgan, J.W. 1996. Re-Os ages of group IIA, IIIA, IVA, IVB iron meteorites. Science 271(5252):1099-1102 doi:10.1126/science.271.5252.1099

Online_Linkage: https://doi.org/10.1126/science.271.5252.1099

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1996

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Smoliar and others, 1996
Source_Contribution:

Provides rhenium and osmium concentrations and osmium isotope ratios.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Selby, D.
Originator: Creaser, R.A.
Publication_Date: 2001
Title:

Re-Os Geochronology and Systematics in Molybdenite from the Endako Porphyry Molybdenum Deposit, British Columbia, Canada

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Economic Geology
Issue_Identification: 96(1):197-204

Publication_Information:

Publication_Place: online
Publisher: GeoScienceWorld

Other_Citation_Details:

Selby, D. and Creaser, R.A. 2001. Re-Os Geochronology and Systematics in Molybdenite from the Endako Porphyry Molybdenum Deposit, British Columbia, Canada. Economic Geology 96(1):197–204 doi:10.2113/gsecongeo.96.1.197

Online_Linkage: https://doi.org/10.2113/gsecongeo.96.1.197

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: Selby and Creaser, 2001
Source_Contribution:

Provides additional information on timing of molybdenite deposition.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Zimmerman, A.
Originator: Stein, H.J.
Originator: Morgan, J.W.
Originator: Markey, R.J.
Originator: Watanabe, Y.
Publication_Date: 2014
Title:

Re-Os geochronology of the El Salvador porphyry Cu-Mo deposit, Chile: Tracking analytical improvements in accuracy and precision over the past decade

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geochimica et Cosmochimica Acta
Issue_Identification: 131:13-32

Publication_Information:

Publication_Place: online
Publisher: Elsevier

Other_Citation_Details:

Zimmerman, A., Stein, H.J., Morgan, J.W., Markey, R.J., and Watanabe, Y. 2014. Re-Os geochronology of the El Salvador porphyry Cu-Mo deposit, Chile: Tracking analytical improvements in accuracy and precision over the past decade. Geochimica et Cosmochimica Acta 131:13-32 doi:10.1016/j.gca.2014.01.016

Online_Linkage: https://doi.org/10.1016/j.gca.2014.01.016

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2014

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Zimmerman and others, 2014
Source_Contribution: Analytical improvements for Re-Os geochronology

Source_Information:

Source_Citation:

Citation_Information:

Originator: Kreiner, D.C.
Originator: Jones, J.V., III
Originator: Todd, E.
Originator: Holm-Denoma, C.
Originator: Caine, J.S.
Originator: Benowitz, J.
Publication_Date: 2019
Title:

Links between Tectonics, Magmatism, and Mineralization in the Formation of Late Cretaceous Porphyry Systems in the Yukon-Tanana Upland, Eastern Alaska, USA

Geospatial_Data_Presentation_Form: book chapter
Series_Information:

Series_Name:

Proceedings of the 15th Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting

Issue_Identification: vol. 3

Publication_Information:

Publication_Place: Glasgow, Scotland
Publisher: Society for Geology Applied to Mineral Deposits

Other_Citation_Details:

Kreiner, D.C., Jones, J.V., III, Todd, E., Holm-Denoma, C., Caine, J.S., Benowitz, J. 2019. Links between Tectonics, Magmatism, and Mineralization in the Formation of Late Cretaceous Porphyry Systems in the Yukon-Tanana Upland, Eastern Alaska, USA. Proceedings of the 15th Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting, 27-30 August 2019, Glasgow, Scotland, vol. 3, pp. 939–942.

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2019

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Kreiner and others, 2019
Source_Contribution:

Provides information regarding porphyry systems in the Yukon-Tanana Upland, eastern Alaska.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Kreiner, D.C.
Originator: Jones, J.V., III
Originator: Kelley, K.D.
Originator: Graham, G.E.
Publication_Date: 2020
Title:

Tectonic and magmatic controls on the metallogenesis of porphyry deposits in Alaska

Geospatial_Data_Presentation_Form: book chapter
Series_Information:

Series_Name:

Porphyry Deposits of the Northwestern Cordillera of North America—A 25-year update

Issue_Identification: CIM Special Volume 57

Publication_Information:

Publication_Place: Montreal, Quebec, Canada
Publisher: Canadian Institute of Mining and Metallurgy

Other_Citation_Details:

Kreiner, D.C., Jones, J.V., III, Kelley, K.D., and Graham, G.E. 2020. Tectonic and magmatic controls on the metallogenesis of porphyry deposits in Alaska: in Sharman, E.R., Lang, J.R., and Chapman, J.B., eds., Porphyry Deposits of the Northwestern Cordillera of North America—A 25-year update: Montreal, Quebec, Canadian Institute of Mining and Metallurgy Special Volume 57, p. 134-175.

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2020

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Kreiner and others, 2020
Source_Contribution:

Provides information regarding metallogenesis of porphyry deposits in Alaska.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Kreiner, D.C.
Originator: Flood, Z.
Originator: Stephens, D.
Originator: Holm-Denoma, C.
Originator: Graham, G.
Originator: Creaser, R.
Publication_Date: 2022
Title:

Geology, Geochronology, Alteration, and Mineralization of the Taurus District Porphyry Cu-Mo(-Au) Systems in Eastern Alaska

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Economic Geology
Issue_Identification: TBD

Publication_Information:

Publication_Place: online
Publisher: GeoScienceWorld

Other_Citation_Details:

Kreiner, D.C, Flood, Z., Stephens, D., Holm-Denoma, C., Graham, G., and Creaser, R. in prep. Geology, Geochronology, Alteration, and Mineralization of the Taurus District Porphyry Cu-Mo(-Au) Systems in Eastern Alaska. Economic Geology TBD

Online_Linkage: https://doi.org/TBD

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2022

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Kreiner and others, 2022
Source_Contribution:

Provides information regarding the age of Taurus District samples.

Process_Step:

Process_Description:

Preparation of a molybdenite mineral separate was made by isolating molybdenite-bearing parts of each rock, then metal-free crushing and sieving followed by magnetic and gravity concentration methods. The 187Re and 187Os concentrations in molybdenite were determined by isotope dilution mass spectrometry using Carius-tube, solvent extraction, anion chromatography and negative thermal ionization mass spectrometry techniques. For this work, a mixed double spike containing known amounts of isotopically enriched 185Re, 190Os, and 188Os (Markey et al., 2007; Alberta) or a tracer solution consisting of enriched 185Re and a normal Os isotope composition was used (cf. Selby and Creaser, 2001; Durham). Isotopic measurements were determined using a ThermoScientific Triton mass spectrometer by Faraday collector. Total procedural blanks for Re and Os are less than <3 picograms and 2 picograms, respectively, which are insignificant in comparison to the Re and Os concentrations in molybdenite. The Reference Material 8599 Henderson molybdenite (Markey et al., 2007) is routinely analyzed as a control sample, which yielded a running average Re-Os date as of 2017 (year of analysis) of 27.78 ± 0.06 Ma (n=18 Alberta) and 27.67 ± 0.08 Ma (n=22 Durham), indistinguishable from the Reference Age Value of 27.66 ± 0.01 Ma (Markey et al., 2007; Zimmerman et al., 2014). Re-Os model ages are calculated assuming a 187Re decay constant of 1.666e-11± 5.165×10−14 a−1 (Smoliar et al, 1996).

An overall encapsulation of analyses is included with this data package in the file: "README_ReOs_geochronologyData_yukonTanana_kreiner.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: World Geodetic System of 1984
Ellipsoid_Name: World Geodetic System of 1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: ReOs_geochronologyDataDictionary_yukonTanana_kreiner.csv
Entity_Type_Definition:

This table is presented as a Comma Separated Values (.csv) file and contains 17 entries which outline the table names, field names, an explanation of each field, and units of measure, as applicable.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: TABLE
Attribute_Definition: Name of the data table that the 'FIELD_NAME' is found in.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The only attribute for this dataset is 'ReOs_geochronologyData_yukonTanana_kreiner.csv'.

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:

Specified units of measurement, as applicable to the parameter attributed.

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: 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: Ma
Enumerated_Domain_Value_Definition: Mega-Annum (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

Detailed_Description:

Entity_Type:

Entity_Type_Label: ReOs_geochronologyData_yukonTanana_kreiner.csv
Entity_Type_Definition:

This table contains sample names and collection locations, prospect and mineral identifiers with observations and descriptions, and specific mineral concentration and age determinations. This table is presented as a Comma Separated Values (.csv) file and contains 12 entries.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Sample
Attribute_Definition:

Sample number as collected in the field; USGS identifier, drill hole collar and depth in meters, or Alaska Division of Geological and Geophysical Surveys alphanumeric identifier.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset often consist of a two-digit year of collection, initials of the collector, and a number indicating order of collection. Drill hole sample identifiers have similar formats, but include depths of core sample analyzed, as noted in a range of distances from drill collar (in meters).

Attribute:

Attribute_Label: Latitude
Attribute_Definition:

Sample location in decimal degrees latitude, WGS84. One core sample, MOS75-1-378.1 did not have a latitude provided or available; therefore, the latitude of the prospect area it was taken from is provided, to an accuracy of 0.01 degrees.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 63.5245
Range_Domain_Maximum: 64.2262
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: Longitude
Attribute_Definition:

Sample location in decimal degrees longitude, WGS84. One core sample, MOS75-1-378.1 did not have a longitude provided or available; therefore, the longitude of the prospect area it was taken from is provided, to an accuracy of 0.01 degrees.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -143.8930
Range_Domain_Maximum: -141.2598
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: Prospect
Attribute_Definition: Mineral prospect identifier for sample.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset are approved prospect names or location aliases of record within the state of Alaska, as noted in the Alaska Resource Data File (ARDF) https://mrdata.usgs.gov/ardf/

Attribute:

Attribute_Label: Mineral_Analyzed
Attribute_Definition: Mineral analyzed by Re-Os technique.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Molybdenite
Enumerated_Domain_Value_Definition: Molybdenite
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Lab
Attribute_Definition:

General geographic location name of the laboratory where sample processing took place.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Alberta
Enumerated_Domain_Value_Definition:

Processing lab: Robert A. Creaser at the University of Alberta, Canada

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Durham
Enumerated_Domain_Value_Definition:

Processing lab: David Selby at the University of Durham, United Kingdom

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Re_ppm
Attribute_Definition: Rhenium (Re) concentration, in parts per million.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.017
Range_Domain_Maximum: 1117.0
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: Re_2sigma_ppm
Attribute_Definition:

Two-sigma, or 95% confidence uncertainty for Rhenium (Re) concentration analyzed in sample.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0001
Range_Domain_Maximum: 3.0
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: 187Re_ppm
Attribute_Definition:

187 mass Rhenium (Re) isotope concentration, in parts per million.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0104
Range_Domain_Maximum: 702.3
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: 187Re_2sigma_ppm
Attribute_Definition:

Two-sigma, or 95% confidence uncertainty for 187 mass Rhenium (Re) isotope concentration analyzed in sample.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00004
Range_Domain_Maximum: 2.1
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: 187Os_ppm
Attribute_Definition:

187 mass Osmium (Os) isotope concentration, in parts per million.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.011
Range_Domain_Maximum: 832.7
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: 187Os_2sigma_ppm
Attribute_Definition:

Two-sigma, or 95% confidence uncertainty for 187 mass Osmium (Os) isotope concentration analyzed in sample.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0
Range_Domain_Maximum: 1.4
Attribute_Units_of_Measure: ppm (parts per million)

Attribute:

Attribute_Label: Model_Age_Ma
Attribute_Definition: Re-Os model age calculated for sample.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 61.9
Range_Domain_Maximum: 114.7
Attribute_Units_of_Measure: Mega-Annum (millions of years before present)

Attribute:

Attribute_Label: Model_Age_2sigma_Ma
Attribute_Definition:

Two-sigma, or 95% confidence uncertainty and including decay constant uncertainty for model age calculated in sample.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.3
Range_Domain_Maximum: 4.5
Attribute_Units_of_Measure: Mega-Annum (millions of years before present)

Attribute:

Attribute_Label: Vein_Description
Attribute_Definition:

Description of vein style and mineralogy; vein assemblage precedes '//', and alteration envelope follows '//', if present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset are visual observations made of the veins sampled. Some samples are delineated by a '//', and additional description of alteration evidence described thereafter. This is a free text field.

Attribute:

Attribute_Label: Host_Rock
Attribute_Definition: Rock name for sample containing the vein.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset includes general rock names or types attributed through visual observation of the sample. Some samples also include prospect or geologic age modifiers. This is a free text field.

Attribute:

Attribute_Label: Host_Rock_Age_Ma
Attribute_Definition:

Approximate age for host rock; Taurus District samples are documented in Kreiner and others, 2022.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset contains geologic age nomenclatures, at a minimum. Some samples include specific age determinations (numbers denote age in millions of years before present, within parentheses). This is a free text field.

Attribute:

Attribute_Label: Comments
Attribute_Definition:

Comments on analysis or sample that may affect the interpreted model age. Blank cells are present, indicating no comments were added.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

The values in this dataset are observations noted by the author or laboratory regarding procedures and analysis. This is a free text field, however, blank cells are shown where comments were not included.

Re-Os Geochronologic Data for Porphyry Deposits in the Yukon-Tanana Upland, Eastern Alaska

Metadata: