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タイトル: Pressure-Temperature-Water Production Rate Paths in the Subduction Metamorphism
その他のタイトル: 沈み込み変成作用の圧力-温度-水生成量
著者: Toriumi, Mitsuhiro
Inui, Mutsuko
著者(別言語): 鳥海, 光弘
乾, 睦子
キーワード: metamorphism
water release
発行日: 2002年2月12日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第76冊第3号, 2002.2.12, pp. 367-376
抄録: Metamorphic pressure and temperature paths were precisely inferred by chemical zonal structure of garnet from the core to the rim in pelitic systems using the differential thermodynamic method. We obtained P-T paths from the Sambagawa metamorphism such that the pressure and temperature increased gradually during the growth of garnet. The zonal structures of garnet show a continuous change of pressure and temperature but indicate wide variations in the garnet production rate. The molar production rates of garnet during prograde metamorphism, denned by dm/dP were precisely obtained, in which m is the molar production of garnet normalized by the grain volume. The rates commonly show two peaks near the early and late stages. The general trends of molar production rates show a gradual increase with increasing pressure, but there are several peaks and the rates suggest episodic water release from metamorphic rocks in the process of subduction.
URI: http://hdl.handle.net/2261/13230
ISSN: 00408972


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