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

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. © 2001, Japan Association of Mineralogical Sciences. All rights reserved.