<報文>岩手縣米里金山の鑛石 : 特に輝コバルト鑛について

概要

論文の詳細を見る
The Yonesato contact metasomatic deposits are situated about 1.5 kilometers east of the Akagane Mine. The district is composed of amphibolite, schalstein, slate, chert and limestone of palaeozoic age and intruded by granite-porphyry, quartz-porphyry, diorite-porphyrite and gabbro. The ore deposits develop in the contact zone between palaeozoic formation and porphyries. The skarn and gangue minerals are diopside, hedenbergite, garnet, hornblende, axinite, quartz, calcite and epidote, and ore minerals are pyrrhotite, pyrite, chalcopyrite, magnetite, native bismuth, bismuthinite, wittichenite, native gold and cobaltite. Native gold, usually accompanied by small quantity of ore minerals, are disseminated into the grain bounderies of gangue minerals. Bismuthinite and wittichenite not only crystallized from the original ore fluid, but also were formed as reaction rims between native bismuth and chalcopyrite or pyrite. Cobaltite, rare mineral in Japan, was examined microscopically, chemically and rontgenographically.
東北大学の論文
1955-09-25