Sangun Metamorphic Rocks of the Gotsu District, Shimane Prefecture

島根県江津地域の三郡変成岩類

Sangun Metamorphic Rocks of the Gotsu District, Shimane Prefecture

Creators Okamura Yoshihiko

Creators Okaya Tsutomu

Sangun metamorphic rocks of this disrict are grouped petrologicaly and straigraphically into two areas : i east area, mainly composed of black schists and green schists. Thickness is about 2500m. 2. west area, mainly composed of green schist and meta-diabase, and black schist. Thickness is more than 3000m. Both formations have a general trend running E-W or NEE-SWW direction, although the anticlinal and synclinal structures are developed. Cnnstituent minerals in green schists are glaucophane-epidote-albite-chlorite-actinolite in the east area, and actinolite-epidote-albite-chlorite in the west area. Judging from mineral assemblages the Sangun metamorphic rocks in this area belong to epidote-glaucophane facies in the east area, and epidote-actinolite facies in the west area.