谷川連峰周辺の地質(概報)

概要

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This area situates at the boundary between Niigata and Gumma prefectures. In the central part of this area, quartz diorite mass is widely distributed and in the eastern and northeastern parts, pre-tertiary rocks are distributed at the tops of the mountains. Pre-tertiary rocks are composed of the so-called "unknown Mesozoic" formation, serpentine and Cretaceous biotite granite. The former two are thermally metamorphosed by the latter. The rocks are also intruded by many diabase dykes. Serpentine includes xenolithic bodies of crystalline schist at the summit of the Tanikawa-dake, Southern and northern parts of this area are widely covered by the Neogene formation. The stratigraphic succession of the Neogene formations in ascending order is as follows: the Shigekura-dake conglomerate formation, Oshoji-no-ataina basalt formation, Mantaro-yama shale formation, Sennokura-yama pyroclastics formation and Akaya shale formation. These formations are considered to belong to Miocene in age and are roughly correlated to the Neogene formation of the Minakami district described by ARAI and KIZAKI (1958). The Akaya formation, the uppermost formation of the area, and lower formations are intruded by quartz diorite mass and are thermally metamorphosed.
地学団体研究会の論文
1967-03-25