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Journal of Oceanography

, Volume 33, Issue 6, pp 297–310 | Cite as

Neogene geological history of the Tohoku Island Arc system

  • Eiichi Honza
  • Hideo Kagami
  • Noriyuki Nasu
Article

Abstract

The Pacific-type orogeny in the Tohoku Island Arc is discussed using marine geological and geophysical data from both Pacific and Japan Sea along the Tohoku region. The Tohoku Arc is divided into three belts; inner volcanic and sedimentary belt, intermediate uplifted belt and outer sedimentary trench belt. Thick Neogene sediments which are distinguished in several layers by continuous seismic reflection profiling occur on both sides of the intermediate belt. The dominant structural trend of the Neogene layers is approximately parallel to the coast line and to the axis of the Japan Trench and has a extension of approximately 100 km in each unit on the Pacific side. The trench slope break is an uplifted zone of Neogene layers. The structural trend of the upper continental slope and outer shelf is relative uplift of the landward side. Tilted block movement toward the west is the dominant structural trend on the Japan Sea side. Structural trends which can be seen in both the inner and outer belts may suggest horizontal compressional stress of east to west. Orogenesis and tectogenesis in the Tohoku Arc has been active since early Miocene or latest Oligocene. It may be implied that the Japan Trench was not present during Late Cretaceous to Paleogene, as is suggested by the volcanism of the Tohoku Arc. The basic framework of the present structure was formed during late Miocene to early Pliocene in both the inner and outer belts. Structural movements were reactivated during late Pleistocene.

Keywords

Trench Continental Slope Shelf Edge Japan Trench Japan Basin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Oceanographical Society of Japan 1977

Authors and Affiliations

  • Eiichi Honza
    • 1
  • Hideo Kagami
    • 2
  • Noriyuki Nasu
    • 2
  1. 1.Marine GeologyGeological Survey of JapanKawasakiJapan
  2. 2.Ocean Research InstituteUniversity of TokyoTokyoJapan

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