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40Ar/39Ar analysis of sample 97RN507A

Dates

Dataset Reference Date
2020-12-28
Info Date
1997

Summary

After irradiation, the mineral separates were analyzed by step heating, using a 6-watt argon-ion laser, as described in Layer and others (1987). On average, 12-16 fractions were collected for each sample. Standards were included with each set of unknowns to nomitor the neutron flux. Each gas fraction was analyzed for Ar isotopic ratios in a VG-3600 mass spectrometer. The argon isotopes measured were corrected fro system blank and mass discrimination, as well as Ca, K, and Cl interference. Where 3 or more consecutive heating steps yielded the same age (+ or (-) 1 sigma), which accounted for more than 50% of the released Ar, the weighted average of these steps was calculaated as the

Attached Files

Material Request Instructions

For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/2768

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  • ReSciColl Archive

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Type Scheme Key
title Parent-4f4e49d8e4b07f02db5df185 40Ar/39Ar analysis of sample 97RN507A

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Geochemical analysis files

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