著者

Wada Hideki Ohashi Fumio Fujioka Kantaro

出版者

Shizuoka University. Institute of Geosciences

雑誌

Geoscience reports of Shizuoka University (ISSN:03886298)

巻号頁・発行日

vol.20, pp.167-173, 1994-03

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Massive magnesite deposits in the Setogawa Group in Shizuoka were formed by an extensive carbonation of serpentinite in an ancient accretionary prism. Stable isotopic investigations of the origin of massive magnesite deposits revealed that a homogeneous deep-seated magmatic carbon mixing with marine limestones may be the main source of the carbon. Many calcite and dolomite veins occur in the serpentines, basaltic and pelitic rocks and based upon carbon and oxygen isotopes are supposed to be of similar origin to carbonate veins found in modern serpentine diapirs of the Izu-Bonin and Mariana is-land arc. In contrast, massive magnesite deposits were formed during the subduction of an active volcano and/or an active ridge, with circulation of magmatic carbon providing the carbon source for the serpentine diapirs.

著者

佐野 貴司 Sano Takashi 和田 秀樹 Wada Hideki 海野 進 Unimo Susumu 中村 俊夫 Nakamura Toshio

出版者

名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会

雑誌

名古屋大学加速器質量分析計業績報告書

巻号頁・発行日

vol.3, pp.67-75, 1992-03

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We obtained radiocarbon datings of 29,209±554 yrBP. for shell sample from Pukaki and 30,230±413 yrBP. for that from Motukorea in the Auckland Volcanoes, New Zealand. When we supply the ages of indivisual volcanoes and compositional change with time, it can be possible to elucidate the magma system of the Auckland Volcanic Field.