Abstract
Crystalline schists in the district consist of sandstone-schists, black-schists of pelitic origin, green-schists of basic tuff and lava origin, and quartz-schists of chert origin., The formation of crystalline schists in the district is tabulated in the descending order as follows : Minawa formation comprises four beds of green-schists anb two beds of sandstone-schists; the other members are pinkish quartz -schists, and black-schists 1000∼300Om., Koboke formation is mainly sandstone-schists inter-bedded with black-schists and green-schists 300∼50Om., Kawaguchi formation is mainly composed of black-schists, interbedded with green-schists 100∼200m., Oboke formation almost exclusively consists of sandstone-schists 30∼50m., The ore-deposit of the Shingu Mine lies in the lowermost, non-spotted green-schists of Minawa formation., The ore-deposit is a Kieslager in type, having a pole-like form., The foot-wall of the ore body is green-schists, characterized by the presence of quartz, carbonate and hematite, and the hanging-wall is massive green-schists, characterized by the abundance of epidote, and parallel seams or veinlets of hamatite-quartz, chlorite, stilpnomelane, magnetite., In the green-schists near the contact with ore bodies are impregnated granules or pyrite and chalcopyrite, forming sinuated seams., The axis of sinuation coincides with that of the lineation of green-schists.,
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