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タイトル: Report on DELP 1987 Cruises in the Ogasawara Area : Part I : General Outline
その他のタイトル: DELP1987年度小笠原海域航海報告 : I : 概説
著者: Japanese Delp Research Group on Back-Arc Basins
著者(別言語): DELP背弧海盆研究班
発行日: 1989年9月30日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第64冊第2号, 1989.9.30, pp. 119-131
抄録: Late in the fall of 1987, as a part of the Japanese National Research Program (DELP/Dynamics and Evolution of the Lithosphere Program : Japanese title of ILP) a geophysical and geological research cruise (DELP-87 cruise by two vessels) was carried out in the western margin of the Pacific and the Ogasawara (Bonin) Trough area, one of the back-arc basins in the western part of the Pacific. It is suggested through the present and past studies that the trough has been formed as a result of differential rifting and subsequent opening of the Parece Vela and Shikoku Basins in the middle Tertiary. The crustal structure of the trough is basically similar to those of other part of the Izu-Ogasawara system but it represents a consequence of tectonic stretching. Therefore, the horizontal stress field of the trough area between ca. 50 and 20 Ma may have been extensional. A conspicuous feature of the world's highest gravity anomaly associated with the existence of a large Boninite mass around the Ogasawara Ridge in the eastern part of the trough must be supported by some dynamic uplifting force if not a compressive horizontal stress field.
URI: http://hdl.handle.net/2261/13030
ISSN: 00408972


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