Bedded manganese deposit

Japanese: 層状マンガン鉱床 - そうじょうマンガンこうしょう（英語表記）bedded manganese deposit

A sedimentary manganese deposit that occurs in layers and is the main source of manganese. It was formed from the Precambrian to the Quaternary period. The main producing countries and their percentage of the world's total production (1985) are the former Soviet Union (32%), South Africa (17%), Gabon (12%), and Brazil (12%), all of which mine layered manganese deposits. South Africa has the largest reserves, accounting for 53% of the world's. The representative deposit in the Soviet Union is found in Nikopol (now Ukraine) on the Black Sea coast, in shallow marine sediments from the Oligocene era that are mainly composed of sandstone.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

層状をなして産する堆積性のマンガン鉱床で，マンガンの主要供給源。生成時代は先カンブリア時代から第四紀にわたる。主要産出国と世界の総産出量に対する割合(1985)は，旧ソ連(32％)，南ア(17％)，ガボン(12％)，ブラジル(12％)で，いずれも層状マンガン鉱床を採掘している。埋蔵量は南アが最大で，世界の53％を占める。ソ連の代表的鉱床は黒海沿岸のニコポリ(現ウクライナ領)で，砂岩を主とする漸新世の浅海堆積物中に産する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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