Preferred Orientation of Tourmaline in Crystalline Schists from the Sazare Mine, in Central Shikoku, Japan

ÔYAGI Norio

廣島大學地學研究報告

Geological report of the Hiroshima University

Two specimens of spotted quartz-schist and spotted greenschist rich in tourmaline were collected from the Sazare Mine in the Sambagawa metamorphic zone. In these specimens, dimensional orientation and lattice orientation of minerals have been analyzed. The longest dimension in these minerals is parallel to the fabric axis b, which is set up parallel to the high angle lineation developed at the horizon bearing the ore body of the Sazare Mine. The longest dimension of tourma-line coincides with [0001] and that of amphibole with c-axis. Orientation diagrams show that [0001]-axes of tourmaline are oriented parallel to the fabric axis b. For amphibole, it is inferred from the orientation diagrams for X, Y, and Z that c-axes are also oriented parallel to the fabric axis b. This coincidence of [0001] of tourmaline and c-axes of amphibole to the fabric axis b parallel to the high angle lineation, suggests that the fabrics of these minerals have been produced at the stage of deformation concerning the high angle lineation.

eng

廣島大學理學部地學教室

[ISSN] 0073-2303

[NCID] AN00213676