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40Ar/39Ar analysis of sample NAP1

Dates

Dataset Reference Date
2020-12-28
Info Date
2001

Summary

Samples are step-heated in a Modifications Ltd. Low-bland furnace connected on-line to the mass spectrometer. Temperature control is accurate to 1C. Extracted argon is purified in a two-stage process. First stage exposes the ssample to a liquid nitrogen cold finger and a Ti furnace at 700C for 20 minutes. Argon is then drawn onto activated charcoal for 20 minutes. Argon is then released from the charcoal and further purified using a SAES ST101 getter for 10 minutes. Purifiec argon isotopes are then measured using a Nuclide 6-60-SGA 15 cm mass spectrometer. Sensitivity of the instrument is 6.5 x 10^-15 mol/mV and system noise is generall around 0.02 mV.

Attached Files

Material Request Instructions

For the publication containing sample radiometric age data, see: https://dggs.alaska.gov/pubs/id/2669

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  • ReSciColl Archive

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Type Scheme Key
title Parent-4f4e49d8e4b07f02db5df185 40Ar/39Ar analysis of sample NAP1

NGGDPP Item Extension

alternateGeometryThe coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Location provided by Werdon, M.B., written communication 2006

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