地向斜地域の鉱床,とくに古生層中のマンガン鉱床の分布

概要

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There are a large number of manganese ore deposits in Japan which are widely distributed from Hokkaido, through Honshu and Shikoku, to Kyoshu. These ore deposits can be divided on the basis of shape of the ore bodies and relations to the country rocks in to the following two types. (A) Ore deposits forming lenticular, layered or irregular massive types, which are generally comformable to the strata of the country rocks. (B) Ore deposits forming vein type which apparently cuts across the strata of the country rocks. In this paper, geographical distribution of the type A ore deposits and relations hip between the ore deposits and geological age of the country rocks are briefly presented. The ore deposits of the type A occur informations of every geological age. Thus, the ore deposits are futher classified into five groups. 1) Deposits in Paleozoic (Chichibu formation) sediments. 2) Deposits in Mesozoic (Shimanto, Hidaka group) sediments. 3) Deposits in Tertiary (Eocene, Miocene) sediments. 4) Deposits in Quaternary (Recent) sediments. 5) Deposits in the metamorphic rocks (Ryoke, Sambagawa, Sangun, and Abukuma). Fig. 1 shows the distribution of the major manganese ore deposits. Furthermore, the relation between the ore deposits and geological age of the country rocks can be summarized in Table 2.
日本地質学会の論文
1968-07-31