The McClure Mountain Syenite Apatite as a Potential Age Control Reference Material for LA‐ICP‐MS AFT and U‐Pb Double Dating - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) Geostandards and Geoanalytical Research Année : 2024

The McClure Mountain Syenite Apatite as a Potential Age Control Reference Material for LA‐ICP‐MS AFT and U‐Pb Double Dating

Résumé

Apatite fission track (AFT) dating is now routinely performed using LA‐ICP‐MS, and U‐Pb age data are often acquired at the same time, allowing double dating of individual grains. Furthermore, additional geochemical data, such as REE mass fractions are readily acquired during the analysis. It is therefore of practical interest to identify a single material as a quality control on ages and composition. Here we present AFT and U‐Pb data for the McClure Mountain Syenite (MMS) apatite, already widely used as an age reference material by the U‐Pb community. We performed double dating on 238 grains, in thirteen measurement sessions over two years. The AFT data show remarkable reproducibility with an overall central age of 254.1 ± 5.1 Ma. The U‐Pb results agree with the reference age for individual sessions (and for all data together). The results show that that the McClure Mountain apatite is a valid quality control material for double dating, allowing the use of the same material for both methods. We also propose to extend the quality control using MMS to trace element measurements performed in conjunction AFT and U‐Pb dating.

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Géochimie
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insu-04472127 , version 1 (22-02-2024)

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Nathan Cogné, Alexis Derycke, Kerry Gallagher. The McClure Mountain Syenite Apatite as a Potential Age Control Reference Material for LA‐ICP‐MS AFT and U‐Pb Double Dating. Geostandards and Geoanalytical Research, In press, ⟨10.1111/ggr.12545⟩. ⟨insu-04472127⟩
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