Geology and Sedimentary Environments of Iwami Kuroko Mine, Shimane Prefecture

概要

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The Iwami kuroko mine, located at 5 kilometers west of Iwami-Ohta City is producing copper, lead and zinc concentrates.<BR>The geology of this area is mainly composed of the Miocene pyroclastics and sediments. The kuroko deposits occur between black shale and conformably underlying rhyolitic tuff. The environments in which kuroko deposits were formed, appear to be those of a shallow sea near the land, considering from the existence of pisolites in the rhyolitic tuff.<BR>A cave-in had occured in the vicinity of kuroko deposits right after ore deposition. Thus, the deposits avalanched into the basin and formed talus piles.<BR>At he upper part of the Kuroko deposits, some sedimentary structures, such as flow casts, load casts, cross bedding, wash-out, etc. were observed. These structures indicate that the kuroko deposits were formed syngenetically at the depth of not more than 20 meters where the long shore current could be influential.
資源地質学会の論文