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40Ar/39Ar analysis of sample 03RN121A

Dates

Dataset Reference Date
2020-12-28
Info Date
2003

Summary

As specified in Douglas (1997). 40Ar/39Ar incremental thermal-release spectra were produced by incrementally heating a sample and measuring the apparent age, as reflected by 40Ar/39Ar ratios, for each thermal step. Each fraction of Ar that was released is displayed on the x-axis of the age spectra. The integrated age is the age given by the total gas measured and is equivalent to a K-Ar age. The spectrum provides a plateau age if three or more consecutive gas fractions represent at least 60% of the total gas released and are withig 2 SD of each other. The plateau age represents an approximation to the true original cooling age. Plateau ages were calculated as described in McDougall and Harrison 1988. If a plateau is not present then [...]

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For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/2972

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  • ReSciColl Archive

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title Parent-4f4e49d8e4b07f02db5df185 40Ar/39Ar analysis of sample 03RN121A

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Locations measured using Garmin GPS, recorded in field notebooks and manually transcribed into Minerals section field database, loaded from field database W/O QC. Possible alternate location: 65.5, -148.51 ; Alternate location published in RI 2016-5: 65.50942398850, -148.51183216500

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