粘土鉱物の酸素・水素同位体比温度計による海底下温度構造の推定

石橋 純一郎; 板谷 優志; 尾上 哲治; フォーレ ケビン

doi:10.14862/geochemproc.70.0_173

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.70.0_173

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 : 70

Date : September 14, 2023 - September 24, 2023

Subseafloor thermal gradient revealed by isotope geothermometry of clay mineral

*Ishibashi Jun―ichiro, Itatani Yushi, Onoue Tetsuji, Faure Kevin

Author information

Keywords: Seafloor massive sulfide deposits, hydrothermal alteration, Okinawa Trough

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 173-

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Abstract

We conducted oxygen and hydrogen isotope measurements of clay mineral in a sediment core obtained from an active hydrothermal filed in the Okinawa Trough, in order to estimate subseafloor thermal gradient based on isotope geothermometry. We found very steep thermal gradient up to 20 degree/meter at the upper most layer of the altered zone.

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