Alaska Radiometric Ages

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1999
Title: Alaska Radiometric Ages
Geospatial_Data_Presentation_Form: tabular digital data
Online_Linkage: https://mrdata.usgs.gov/akages/
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Currentness_Reference:
Date on which data provided online was extracted from the database
Description:
Abstract:
The Alaska Radiometric Age file is a database of radiometric ages of rocks or minerals sampled from Alaska. The data was collected from professional publications and/or received from researchers and used by permission.
Purpose:
Database of radiometric ages is designed to aid in the research of geochronologic information of Alaska rocks and minerals. Users should always review the cited publications for more complete descriptions of the samples, analyses, and geologic interpretation.
Supplemental_Information:
The radiometric dates in this data set were collected from published sources through 1990(approximately). The dates were compiled over many years and published as a map in the series Decade of North American Geology, by the Geological Society of America.
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 172.0
East_Bounding_Coordinate: -130.0
North_Bounding_Coordinate: 72.0
South_Bounding_Coordinate: 54.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: General glossary for mineral resources spatial data
Theme_Keyword: columnar text
Theme_Keyword: DBF
Theme_Keyword: HTML table
Theme_Keyword: KML
Theme_Keyword: OGC WFS
Theme_Keyword: OGC WMS
Theme_Keyword: shapefile
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geochronology
Theme_Keyword: geospatial datasets
Theme_Keyword: radiometric dating
Theme_Keyword: rocks and deposits
Place:
Place_Keyword_Thesaurus: Common geographic areas
Place_Keyword: fUS02 = Alaska
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey makes no warranties related to the accuracy of the data and users are required to determine the usability for any particular purpose.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nora Shew
Contact_Address:
Address_Type: mailing and physical
Address: 4200 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667
Country: U.S.A.
Contact_Voice_Telephone: 907-561-1181
Contact_Electronic_Mail_Address: nshew@usgs.gov
Data_Set_Credit:
The radiometric age data base has been maintained since the mid-1970's. Compilers include: F.H. Wilson, Nora Shew, G.D. DuBois, and Shawn Dadisman.
Data_Quality_Information:
Logical_Consistency_Report:
Generally, the radiometric ages in the database are as published. Some potassium-argon ages have been recalculated using the decay constants recommended by the IUGS Subcommission on Geochronology in 1976. Dates that have been recalculated are noted in the 'Comments' field.
Completeness_Report:
The radiometric age database does not include the analytical information which is often found in the published sources. Also, the database records do not contain the geologic interpretation of the analysis. Users of this database should always /refer to the publications listed in the 'Reference' field for detailed information about each analysis.
Lineage:
Process_Step:
Process_Description:
The Alaska radiometric age file is a compilation of published and other released radiometric dates on rocks and minerals of Alaska. The precision of the analyses and the locations of the samples vary widely from the various sources. This compilation has not attempted to interpret the data. Users of this data should always refer to the published sources of the information.

This database contains for each record: location, dating method, rock type, mineral/phase dated, age (in millions of years), comments, and references. The data was imported into Microsoft Access, brought into ArcView3.1 as an event theme, and then converted into a shape file.
Process_Date: 1999
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nora Shew
Contact_Address:
Address_Type: mailing and physical
Address: 4200 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667
Country: USA
Contact_Voice_Telephone: 907-561-1181
Contact_Electronic_Mail_Address: nshew@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.002
Longitude_Resolution: 0.002
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: points
Entity_Type_Definition: Characteristics of points in shape table.
Attribute:
Attribute_Label: Quad
Attribute_Definition: Name of 1:250,000 scale quadrangle
Attribute_Definition_Source: USGS Geographic Names Information System
Attribute_Domain_Values:
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Attribute_Definition: Degree of latitude
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Range_Domain_Maximum: 70
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 1.
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Attribute_Units_of_Measure: minutes
Attribute_Measurement_Resolution: 0.1
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Attribute_Definition: Direction of latitude
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Enumerated_Domain_Value_Definition: North
Attribute:
Attribute_Label: Londeg
Attribute_Definition: Degree of longitude
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Range_Domain_Maximum: 179
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 1.
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Attribute_Definition: Minute of longitude
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Enumerated_Domain_Value_Definition: East
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: West
Attribute:
Attribute_Label: Sample
Attribute_Definition:
Sample ID from published source. If none was given in the cited source, then a sample id was created for this database.
Attribute_Domain_Values:
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Attribute:
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Attribute_Definition: Rock name or type
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Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: altered
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: amphibolite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: andesite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: basalt
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: biotitite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: bentonite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: blueschist
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: breccia
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: conglomerate
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: dacite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: diorite
Attribute_Domain_Values:
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Attribute_Domain_Values:
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Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: granodiorite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GLASS
Enumerated_Domain_Value_Definition: glass
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: granulite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: gneiss
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: greenstone
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: granite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: granitoid
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: greenschist
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: hornblendite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: hornfels
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: intrusive
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: lamprophyre
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: latite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: leucobasalt
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: leucogabbro
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: mafic
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: marble
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: metamorphic
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: metabasite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: metapelite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: metavolcanic
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: metawacke
Attribute_Domain_Values:
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Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: monzonite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: monzodiorite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: mylonite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: OTHER
Enumerated_Domain_Value_Definition: other (rock identified in comments field)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PEG
Enumerated_Domain_Value_Definition: pegmatite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PHYL
Enumerated_Domain_Value_Definition: phyllite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: porphyry
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: pyroxenite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: quartz diorite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: quartz monzodiorite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: quartz monzonite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: quartz sericite
Attribute_Domain_Values:
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Enumerated_Domain_Value: QTZT
Enumerated_Domain_Value_Definition: quartzite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: rhyolite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: sedimentary breccia
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SCH
Enumerated_Domain_Value_Definition: schist
Attribute_Domain_Values:
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Enumerated_Domain_Value: SERP
Enumerated_Domain_Value_Definition: serpentinite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SKARN
Enumerated_Domain_Value_Definition: skarn
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SS
Enumerated_Domain_Value_Definition: sandstone
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: syenite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: tonalite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: trachyte
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: trondjemite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: tuff
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: ultramafic
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: volcanic
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: unidentified
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: xenolith
Attribute:
Attribute_Label: Method
Attribute_Definition: Isotopic dating method
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: Pb-alpha
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: Fission track
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: K-Ar
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: P
Enumerated_Domain_Value_Definition: Pb methods
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: Rb-Sr
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: Sm-Nd
Attribute:
Attribute_Label: Mineral
Attribute_Definition:
Mineral or phase dated from sample; or denotes that date is calculated from an isochron.
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: actinolite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: amphibole
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: apatite
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: anorthoclase
Attribute_Domain_Values:
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Enumerated_Domain_Value_Definition: biotite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: chlorite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: feldspar
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GL
Enumerated_Domain_Value_Definition: glass
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GP
Enumerated_Domain_Value_Definition: glaucophane
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: HO
Enumerated_Domain_Value_Definition: hornblende
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: isochron
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: K-feldspar
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: mica
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: muscovite
Attribute_Domain_Values:
Enumerated_Domain:
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Enumerated_Domain_Value_Definition: other (mineral identified in comments field)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PA
Enumerated_Domain_Value_Definition: paragonite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PH
Enumerated_Domain_Value_Definition: phengnite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PL
Enumerated_Domain_Value_Definition: plagioclase
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PP
Enumerated_Domain_Value_Definition: phologopite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PY
Enumerated_Domain_Value_Definition: pyroxene
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: RI
Enumerated_Domain_Value_Definition: riebeckite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SA
Enumerated_Domain_Value_Definition: sanidine
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SE
Enumerated_Domain_Value_Definition: sericite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SP
Enumerated_Domain_Value_Definition: sphene
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: TR
Enumerated_Domain_Value_Definition: tremolite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: UN
Enumerated_Domain_Value_Definition: unknown
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: WR
Enumerated_Domain_Value_Definition: whole rock
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ZI
Enumerated_Domain_Value_Definition: zircon
Attribute:
Attribute_Label: Age m.y.
Attribute_Definition: Age of sample in millions of years
Attribute_Domain_Values:
Unrepresentable_Domain: positive number
Attribute:
Attribute_Label: Comment
Attribute_Definition: Field for free text.
Attribute_Domain_Values:
Unrepresentable_Domain: free text
Attribute:
Attribute_Label: Ref
Attribute_Definition: Reference of data sample.
Attribute_Domain_Values:
Unrepresentable_Domain: free text
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Tom Kress
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive MS954
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703-648-6328
Contact_Electronic_Mail_Address: thkress@usgs.gov
Resource_Description: akages.shp
Distribution_Liability:
The U.S. Geological Survey (USGS) provides this point data "as is." The USGS make no guarantee or warranty concerning the accuracy of information contained in the dataset. Further, the USGS makes no warranties, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although this data has bee processed successfully on computers at the USGS, no warranty, express or implied, is made by the USGS regarding the use of this data on any other system, nor does the fact of distribution constitute or imply any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: shapefile
Format_Version_Number: 1.0
Format_Information_Content: Sample locations, characteristics, and radiometric ages
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Digital_Form:
Digital_Transfer_Information:
Format_Name: OGC WMS
Format_Version_Number: 1.3.0
Format_Information_Content: Sample locations, characteristics, and radiometric ages
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: OGC WFS
Format_Version_Number: 1.0.0
Format_Information_Content: Sample locations, characteristics, and radiometric ages
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20161207
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nora Shew
Contact_Address:
Address_Type: mailing and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667
Country: USA
Contact_Voice_Telephone: 907-561-1181
Contact_Electronic_Mail_Address: nshew@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://mrdata.usgs.gov/metadata/akages.html>
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