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LA-MC-ICPMS and SHRIMP U-Pb dating of complex zircons from Quarternary tephras from the French Massif Central: Magma residence time and geochemical implications

Cocherie, Alain; Fanning, Christopher; Jezequel, Pierre; Robert, Michele


Analyses of zircon grains from the Queureuilh Quaternary tephras (pumice) provide new information about their pre-eruptive history. U-Pb dating was performed in situ using two methods: SHRIMP and LA-MC-ICPMS equipped with a multi-ion counting system. Both methods provided reliable 207Pb/206Pb and 206Pb/238U ratios as well as U and Th abundances required for U-Pb Concordia intercept age determination, after initial 230Th disequilibrium correction. The new LA-MC-ICPMS method was validated by...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/j.gca.2008.11.028


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