Lawsonite-bearing pelitic schists from the Sanbagawa metamorphic belt in the Ise area, eastern Kii Peninsula, central Japan.

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  • UENO Takashi
    Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University<br>Present Address; Kogakkan High School

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  • 紀伊半島東部，伊勢地方三波川帯から産する含ローソン石泥質片岩
  • キイハントウ トウブ イセ チホウ サンバガワタイ カラ サンスル ガン ローソンセキ デイシツヘンガン

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Abstract

Lawsonite-bearing Sanbagawa pelitic schists occur in the Ise area of the eastern Kii Peninsula, central Japan. The lawsonite-bearing pelitic schists consist mainly of phengite, chlorite, lawsonite, albite, titanite, quartz, calcite and carbonaceous material. The pelitic schists show compositional banding consisting of phengite-rich and quartz-rich layers. The quartz-rich layer is subdivided into coarse-grained and fine-grained layers. Pressure and temperature conditions of the lawsonite-bearing pelitic schists are estimated at <8 kbar and <340°C, based on stability of the phengite+chlorite+lawsonite+albite+quartz+calcite assemblage. Stability of the lawsonite+calcite+titanite indicates low XCO2(<10−4) composition of metamorphic fluid.

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