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近几年来日本对秩父古生层中伴有燧石的层状锰矿床的研究有很大进展,主要是:(1)地槽的性质,(2)对秩父古生层(侏罗一二叠纪)的研究,(3)燧石的成因,(4)锰矿在海底的富集. 根据作者对层状锰矿床的认识和有关矿床记载,下面介绍层状锰矿床的基本观点. 就世界层状锰矿床而言,首先是黑海北岸的尼科波尔型矿床,该类型矿床储量占世界的百分之七十.日本伴有燧石的锰矿床,被认为是在地槽中伴随碱性火山活动形成的,相当于Shatskiy(1954)的火山成因的绿岩-硅质岩类.这类矿床在世界各地分布广,一般规模不大,但富有变化,是很具有
In recent years, great progress has been made in the study of the bedded manganese ore bed with the chert in the Paleozoic in Chichibu, mainly including: (1) the nature of the terrain, (2) (3) the origin of chert, and (4) the accumulation of manganese ore on the seabed.According to the author’s understanding of the bedded manganese deposit and the related records of the deposit, the following introduces the basic view of the bedded manganese deposit. In terms of manganese deposits, the first is the Nicobor deposits on the northern coast of the Black Sea, which account for 70% of the world’s deposits, and the Japanese-chert manganese deposits are believed to be associated with alkaline volcanic activity in the earth’s trough Formed by the volcanic greenstone-siliceous rocks of Shatskiy (1954), which are widely distributed throughout the world, generally small in scale but rich in variation,