西南日本における海溝-島弧-縁海系の地殻構造 : 南海トラフから大和海盆北縁まで Crustal Structure of the Trench-Island Arc-Back-arc Sea System from the Nankai Trough to the Northern Margin of the Yamato Basin, Southwest Japan

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 The first attempt to make a crustal-scale cross-section of a trench-arc-backarc sea system has been successfully accomplished from the Nankai trough to the northern margin of the Yamato basin across Southwest Japan, using three seismic profiles: Nankai trough to Japan Sea coast (Ito <i>et al.</i>, 2009), Oki trough (Tanaka and Ogusa, 1981), and Yamato basin (Sato <i>et al.</i>, 2006). The section contains much new information that will be useful for research on the structural development of the Japanese island arc. The highlight of the information is the substantial difference in the structure between the Outer and the Inner zones. The Outer zone is constructed mainly by N-dipping accretionary complexes in its upper crust with a poorly developed lower crust. On the contrary, the Inner zone exhibits predominantly horizontal structures in its upper crust, beneath which thick horizontal lower crustal laminations occur as in the continental lower crust. Furthermore a 10-km-thick lens-shaped olivine-pyroxene cumulate body underlies the lower crust. The N-dipping Median Tectonic Line juxtaposes two substantially different zones from the upper to lower crusts<br> The section, however, has the following serious defects caused by the poor specifications of the seismic profilings used here: (1) Shallow structures (<about several km) are poorly imaged, which makes it difficult to interpret geological structures. (2) Seismic images beneath the on-and-offshore zones of the Japan Sea coast are missing, which also makes it difficult to understand the rifting process associated with the opening of the Japan Sea. Thus, a new crustal-scale cross-section that is free from these defects is necessary. Fortunately, both the theory and the techniques of seismic profiling have advanced tremendously recently. This situation enables us to conduct seismic profiling along a long seismic line simultaneously on both land and sea (so-called “integrated land-and-sea seismic profiling”), and to provide a new section. The new section is expected to replace the former one soon.

収録刊行物

  • 地學雜誌

    地學雜誌 119(2), 235-244, 2010-04-25

    公益社団法人 東京地学協会

参考文献:  35件中 1-35件 を表示

被引用文献:  9件中 1-9件 を表示

各種コード

  • NII論文ID(NAID)
    10030368548
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    0022135X
  • NDL 記事登録ID
    10704651
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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