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40Ar/39Ar analysis of sample 03MBW390A

Dates

Dataset Reference Date
2020-12-28
Info Date
2003

Summary

Laser dating system was used to step-heat the samples and the monitors, using a 6 W argon-ion laser to step-heat small chips of melt rock following the techniques in Layer et al. (1987). During the heating process, a liquid N cold finger and a Zr-Al getter at 400 degree C purified the gas, which was then measured with a VG3600 mass spectrometer. The Ar isotopes measured were corrected from post irradiation decay of 37Ar and 39Ar, system blank, mass discremination, as well as Ca, K, and Cl interference reactions following procedures of outlined in McDougall and Harrison (1988). The weighted mean of the results obtained on the monitor samples was used on the ensuing calculations for their corresponding set of samples. Between 8 and 12 [...]

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For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/7192

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  • ReSciColl Archive

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Type Scheme Key
title Parent-4f4e49d8e4b07f02db5df185 40Ar/39Ar analysis of sample 03MBW390A

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Garmin GPS, recorded in field notes, then Minerals field database

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