Journal
COMPTES RENDUS GEOSCIENCE
Volume 335, Issue 12, Pages 899-906Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crte.2003.08.010
Keywords
datation U-Th/He; heterogeneous chemistry; cathodoluminescence; laser ablation ICP-MS
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The U-Th/He thermochronology technique assumes a homogeneous distribution of U and Th within the analysed crystals. Cathodoluminescence imaging reveals a strong chemical heterogeneity within apatite a mineral widely used for U-Th/He dating. This heterogeneity is then susceptible to induce large errors when calculating the U-Th/He age. Chemical analysis using laser ablation ICP-MS of the various zones shown by cathodoluminescence display a link between the Ce, U and Th concentration and the luminescence intensity allowing the U-Th/He age to be corrected for zonation. (C) 2003 Academie des sciences. Publie par Editions scientifiques et medicales Elsevier SAS. Tons droits reserves.
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