本邦における一, 二の層状含銅硫化鉄鉱床に見られる鞍状鉱体

抄録

(1) In the Outer zone of the southwestern Japan a large number of cupriferous pyrite deposits occurs in the Sambagawa-Mikabu complex. The writer believes that they belong to the replacement deposit genetically related to the intrusion of basic igneous rocks which was accompanied by folding and regional metamorphism. The deposit of the Ôkuki mine occurs in the schistose green rocks, mainly as saddle reefs in the overturned and plunged folds. The intruded basic rocks occur in the core of the fold. The ore bodies are controlled by the major fold, bedding schistosity, flow cleavage and lineation. The structural features of this deposit are very important from the prospecting of the ore bodies.
(2) The Yanahara mine is the largest pyrite deposit in Japan. Apparently it is composed of massive ore bodies. In the mining area, basic intrusive exists in the folded part of the Trias (?) system. It occurs at the core of the folding and plunges the direction of the folding axis. Along the boundary between clayslate and basic intrusive the ore bodies exist. The main ore bodies occur at the crest of the folding, swelling and pinching to the direction of the plunge of the anticlinal axis. From these facts, it is recognized that the deposit of the Yanahara mine is quite similar to the Ôkuki deposit.