モナズ石に対するレーザーアブレーションICP-MS/MSを用いたウラン系列年代分析法

仁木 創太; 小杉 周平; 岩野 英樹; 檀原 徹; 平田 岳史

doi:10.14862/geochemproc.69.0_133

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.69.0_133

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Name : Abstracts of Annual Meeting of the Geochemical Society of Japan

Number : 69

Date : September 05, 2022 - September 16, 2022

Development of U-series disequilibrium dating methods for monazite using laser ablation-ICP-MS/MS

*Sota Niki, Shuhei Kosugi, Hideki Iwano, Tohru Danhara, Takafumi Hirata

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Keywords: LA-ICP-MS, monazite, geochronology, radioactive disequilibrium

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 133-

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Abstract

We have developed U-series disequilibrium dating methods for monazite as a Th-bearing mineral occurring in Quaternary volcanic rocks to elucidate magmatic processes. For accurate age determinations on Th-bearing minerals, potential interferences of polyatomic ions derived from sample matrices and background counts from ²³²Th should be removed. These interferences can be reduced by utilizing ICP-MS/MS. In this study, analytical accuracy and precision in measurements of ²³⁰Th and ²²⁶Ra are evaluated through the analysis of monazite using multiple-spot laser ablation ICP-MS/MS.

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