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Mn–Cr dating of Fe- and Ca-rich olivine from 'quenched' and 'plutonic' angrite meteorites using Secondary Ion Mass Spectrometr

McKibbin, Seann J; Ireland, Trevor; Amelin, Yuri; Holden, Peter

Description

Angrite meteorites are suitable for Mn–Cr relative dating (⁵ᶟMn decays to ⁵ᶟCr with a half life of 3.7 Myr) using Secondary Ion Mass Spectrometry (SIMS) because they contain olivine and kirschsteinite with very high ⁵⁵Mn/⁵²Cr ratios arising from very low Cr concentrations. Discrepant Mn–Cr and U–Pb time intervals between the extrusive or ‘quenched’ angrite D’Orbigny and some slowly cooled or ‘plutonic’ angrites suggests that some have been affected by secondary disturbances, but this seems to...[Show more]

CollectionsANU Research Publications
Date published: 2015-02-21
Type: Journal article
URI: http://hdl.handle.net/1885/13306
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/j.gca.2015.02.019

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