On the subsurface geology of the central part of Kanto Plain, central Honshu(<Special issue>Subsurface Geology of the Kanto Tectonic Basin)

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  • 関東平野中央部における新第三系・第四系の地質構造について(<特集>関東構造盆地の地質)
  • 関東平野中央部における新第三系・第四系の地質構造について
  • カントウ ヘイヤ チュウオウブ ニ オケル シン ダイ3ケイ ダイ4ケイ ノ チシツ コウゾウ ニ ツイテ

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Abstract

The Kanto Plain is a sedimentary basin composed of Neogene and Quaternary formations surrounded by Pre-Neogene and early Miocene formations in the Kanto Mountains, in the central parts of the Miura Peninsula and in the southern part of the Boso Peninsula. The geology of the basin is divided into the Miura Group, middle Miocene to lower Pilocene in age, the Kazusa Group, upper Pliocene in age to lower Pleistocene in age and the Shimousa Group, middle to upper Pleistocene in age. The seismic reflection surveys showed the subsurface geology and geologic structure under Tokyo Bay and Musashino Upland in the south and southwest parts in Kanto Plain. In Tokyo Bay the Shimousa Group shows a basin-like structure, the Kazusa Group a dome and basins, and the Miura Group anticlines and synclines, some of which extend to the northwest part of the Boso Peninsula to the east of the bay. The older formations are more complicated in geologic structures. A dome in Musashino Upland and a syncline in Tama Hill to the west of the bay do not extend toward east. The depocenters of the Kazusa and Miura Groups shift northeastward in Tokyo Bay which are subparallel to those in the south part of Kanto region. The Shimousa and Kazusa Groups show a dome structure in Musashino Upland. Three synclines composed of the Miura Group running in NW-SE direction are ascertained under those groups which might be comparable to Itsukaichi basin composed of the Miura Group situated at the west end of Kanto Plain. The depocenters of the Kazusa Group shift toward north and those of the Miura Group toward ENE in Musashino Upland.

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