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  1. 140 理学研究科・理学部
  2. 東北大學理學部地質學古生物學教室研究邦文報告

棚倉破砕帯の地質構造

http://hdl.handle.net/10097/33193
http://hdl.handle.net/10097/33193
112373e9-edd0-472f-be2e-dd772897a27e
名前 / ファイル ライセンス アクション
KJ00004208228.pdf KJ00004208228.pdf (8.0 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-02
タイトル
タイトル 棚倉破砕帯の地質構造
言語
言語 jpn
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ departmental bulletin paper
著者 大槻, 憲四郎

× 大槻, 憲四郎

大槻, 憲四郎

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著者(ヨミ)
識別子Scheme WEKO
識別子 30849
姓名 Otsuki, Kenshiro
抄録
内容記述タイプ Abstract
内容記述 The Tanakura Shear Zone constitutes the major tectonic zone which bounds the Abukuma Belt on the east and the Yamizo Belt on the west. This tectonic zone extends from Tanakura to Hitachiota along a NNW-SSE trend in the area studied. The Abukuma Belt is mainly composed of metamorphic and granitic rocks, while the Yamizo Belt is mainly composed of geosynclinal sedimentary rocks of Paleozoic and Mesozoic age. The shear zone is 3-4km in width and is composed of lens-shaped masses of cataclasite and mylonite which originated from the Abukuma and Yamizo belts. These masses are bounded by faults which are arranged in en echelon pattern as a whole. The Tanakura Shear Zone was originated and had primary development during the Cretaceous being closely related to the plutonic activities both in the Abukuma and Yamizo belts. During that period, left lateral displacements may have been occurred along the shear zone. In the areas adjacent to the Tanakura Shear Zone, on the west and east, the Neogene sediments are distributed with clino-unconformity on the basement rocks of the Yamizo and Abukuma belts. The Neogene sediments in area west of the Tanakura Shear Zone are separated by several basins about 10km in diameter, which are distributed along the Shear Zone. Each basin is tilted northeastwards. The eastern margin of each basin is bounded by the western marginal fault of the Tanakura Shear Zone, while the northern margin of each is bounded by a fault nearly perpendicular to the Tanakura Shear Zone. On the northern side of the fault bounding the northern margin of each basin, a granitic mass is always exposed. This systematic distribution pattern of faults and masses of granitic rocks was an important factor in locating the Neogene basins. The basins are filled with andesitic volcanic sandstone, conglomerates, sandstone, andesitic volcanic breccia, black siltstone, breccia and fine sandstone ranging from middle Early Miocene to early Middle Miocene in age. As the total thickness for individual basins ranges from 1000m to 3500m, these basins may have subsided very rapidly. The sediments were deposited in the narrow bay stretching north to south along the west side of the Tanakura Shear Zone. Changes of lithofacies and thickness of sediments reflect the tectonic movement of the Tanakura Shear Zone and its adjacent area during deposition. Rapid subsidence of the basins occurred as if it would have avoided the simultaneity each other among the adjacent basins, so that as a whole these basins subsided in differential movement. During this period, the surveyed area had been influenced by a tensional stress field, but after the retreat of the manine environment from this area, movement along the Tanakura Shear Zone was right lateral on a small scale. In the late Middle Miocene, when the area west of the Tanakura Shear Zone was emergent the area east of the Shear Zone began to subside. Sediments in this area are mainly composed of sandstone and sandy mudstone which were deposited in a narrow bay which developed along the eastern margin of the Tanakura Shear Zone. The sedimentary rocks of this narrow basin are less thick and less deformed with respect to those west of the Shear Zone. Invasions of the sea, from both north and south, took place during different stages to the west and east of the Tanakura Shear Zone, but were limited by the Shear Zone. Pliocene transgression, although less pronounced than the former two, also came from both north and south simultaneously, and tuffaceous sandstone and mudstone were deposited in northern and southern parts of the area. The Pliocene formations formed during this transgression are, however, scarcely affected by the movement of the Tanakura Shear Zone. Therefore, the Tanakura Shear Zone which originated during the Late Cretaceous was active during in the Miocene. but thereafter has not revealed anv important movement.
書誌情報 東北大學理學部地質學古生物學教室研究邦文報告

巻 76, p. 1-71, 発行日 1975-11-10
ISSN
収録物識別子タイプ ISSN
収録物識別子 00824658
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00171452
フォーマット
内容記述タイプ Other
内容記述 application/pdf
著者版フラグ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
その他の言語のタイトル
その他のタイトル Geology of the Tanakura Shear Zone and Adjacent Area
出版者
出版者 東北大學
資源タイプ
内容記述タイプ Other
内容記述 紀要類(bulletin)
登録日
日付 2008-05-02
日付タイプ Created
公開日(投稿完了日)
日付 2008-05-02
日付タイプ Created
発行日
日付 1975-11-10
日付タイプ Created
フォーマット
内容記述タイプ Other
内容記述 8018241 bytes
更新日
日付 2010-01-27
日付タイプ Created
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Cite as

大槻, 憲四郎, 1975, 棚倉破砕帯の地質構造: 東北大學, 1–71 p.

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