日本海の礁堆の地質について

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Some of submarine banks located on the continental borderland in the Japan Sea include Yamato Bank, Kita-Oki Bank, Oki Bank, and Hakusan-Se. Samples collected there from suggest that the basement of the continental borderland possibly consists of metamorphic rocks and plutonic rocks, the former being represented by meta-diorite, and the latter by microcline granite. Some of them are distributed as pebbles over the banks, while the others are collected as broken pieces of the basement. The meta-diorite referred to above is correlated with the so-called amphybolite schist distributed among the Hida mountains in central Japan. The granite is correlated with that of the late Cretaceous period found in San'in district, northwestern part of the country. These basements are covered with acidic volcanic rocks or welded tuff of the late Cretaceanous that show intrusion of submarine volcanic rocks among them. The volcanic rocks present correlation with alkali basalt which mainly occurs in San'in district and the Oki Islands. Geological features of the submarine banks in the Japan Sea adjacent to the northeastern region of the country resemble terrestrial geology of their neighborhood. They are mainly composed of the suhmarine volcanic rocks of the Miocene related with the so-called "Green Tuff". Intrusion of the Quarternary volcanic rocks is evident among them. It may be added here that nodules of barite are distributed over the banks in this part of the Japan Sea.
地学団体研究会の論文
1966-01-30

日本海の礁堆の地質について

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