日本海拡大に関連する第三紀火山岩の鉛、ネオジム、ストロンチウム同位体の特徴

能田 成; 可児 智美; 乙藤 洋一郎

doi:10.14862/geochemproc.51.0.155.0

51th Annual Meeting of the Geochemical Society of Japan

Session ID : 2C06

DOI https://doi.org/10.14862/geochemproc.51.0.155.0

Conference information

Host: The Geochemical Society of Japan

Co-host: The Chemical Society of Japan

rock/crust, ore deposits

Pb, Nd, and Sr isotopic characteristics of the Tertiary volcanic rocks related with the opening process of the japan Sea.

*Susumu Nohda, Tomomi kani, Yo-ichiro Otofuji

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Keywords: isotopic compositions, Japan Sea opening , Tertiary volcanic rocks, mantle, crust

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Abstract

The Japan Sea basin was formed at around 20-15 Ma through back-arc opening process accompaning megatectonic structural change of crust and mantle, and at present, is observed oceanic crust in the basin. We have obtained geochemical evidences to support compositional chemical change of the crust and mantle in the isotopic compositions of Pb, Nd, and Sr in the Tertiary volcanic rocks, NE Japan.

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