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Astronomical calibration of Ar-40/Ar-39 reference minerals using high-precision, multi-collector (ARGUSVI) mass spectrometry

Phillips, David; Matchan, Erin; Honda, Masahiko; Kuiper, K F

Description

The new generation of multi-collector mass spectrometers (e.g. ARGUSVI) permit ultra-high precision (<0.1%) Ar-40/Ar-39 geochronology of rocks and minerals. At the same time, the Ar-40/Ar-39 method is limited by relatively large uncertainties (>1%) in K-40 decay constants and the ages of natural reference minerals that form the basis of the technique. For example, reported ages for widely used Ar-40/Ar-39 reference materials, such as the ca. 28 Ma Fish Canyon Tuff sanidine (FCTs) and the ca....[Show more]

CollectionsANU Research Publications
Date published: 2017-01-01
Type: Journal article
URI: http://hdl.handle.net/1885/160793
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/j.gca.2016.09.027

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