抄録
Dykes of dioritic, leucocratic and bastitic rocks, and vein of diopside cut across the ultra-basic rock in the region. Since the diorite dykes cut chromite bodies it is considered that the chromites was originated in a magmatic cycle. The diorite dykes and dyke form inclusion are composed of fine grained plagioclase, hornblende or pargasite, and magnetite or ilmenite as accessory mineral. The leucocratic rocks are mainly composed of quartz and plagioclase. It is supposed that pyrosenite was altered to the bastitic rock by action of later magmatic water. The rock is white with faint greenish tint.
Clinochlore occurring as a secondary mineral in the ultra-basic rock, was derived from aluminous enstatite by the contact metamorphism. The clinochlore crystal contains small amounts of chromic oxide. The melanite was presumably formed by chemical reaction between chromite and the adjacent pyroxene or olivine owing to the contact metamorphism of ultra-basic rock. The melanite is black grossularite-andradite containing 3.11% Cr2O3.
Many calcite veins of hydrothermal origin filled up along various cracks and openings of the ultra-basic rock and chromite body in the said region. Some of these veins include remnants of massive chromite and serpentinite.
