In-situ Li isotopic analyses of clinopyroxene grains: comparison of SIMS and MC-ICP-MS results

KIM Taehoon; NAKAI Shun'ichi; SUGIURA Naoji; HIYAGON Hajime; MIYAZAKI Akiko

doi:10.14862/geochemproc.51.0.197.0

51th Annual Meeting of the Geochemical Society of Japan

Session ID : 2P25

DOI https://doi.org/10.14862/geochemproc.51.0.197.0

Conference information

Host: The Geochemical Society of Japan

Co-host: The Chemical Society of Japan

rock/crust, ore deposits

In-situ Li isotopic analyses of clinopyroxene grains: comparison of SIMS and MC-ICP-MS results

*Taehoon KIM, Shun'ichi NAKAI, Naoji SUGIURA, Hajime HIYAGON, Akiko MIYAZAKI

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Keywords: Li isotopes, clinopyroxene, SIMS, MC-ICP-MS, mantle xenolith

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Abstract

Recent studies have proposed Li isotopes as a significant tracer providing constraints on the mantle heterogeneity and material recycling. We carried out in-situ analyses of Cpx grains in various mantle xenoliths using SIMS for the determination of internal standards. The results of high d7Li (ca. +5 permil) values are consistent with that of MC-ICP-MS. On the other hand, Cpx grains of lower d7Li (< -11 permil) indicate the variations in Li concentration and the d7Li value even in a single grain, which are not suitable for internal standards. Lower d7Li values and heterogeneity of Li in Cpx grains are suspected to result from the metasomatic fluid.

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