Origin of the early Cenozoic belt boundary thrust and Izanagi-Pacific ridge subduction in the western Pacific margin

被引:36
|
作者
Kimura, Gaku [1 ]
Kitamura, Yujin [2 ]
Yamaguchi, Asuka [3 ]
Kameda, Jun [4 ]
Hashimoto, Yoshitaka [5 ]
Hamahashi, Mari [6 ]
机构
[1] Tokyo Univ Marine Sci & Technol, Dept Marine Environm & Resources, Tokyo, Japan
[2] Kagoshima Univ, Grad Sch Sci & Engn, Dept Earth & Environm Sci, Kagoshima, Japan
[3] Univ Tokyo, Atmosphere & Ocean Res Inst, Chiba, Japan
[4] Hokkaido Univ, Grad Sch Sci, Dept Earth & Planetary Sci, Sapporo, Hokkaido, Japan
[5] Kochi Univ, Fac Sci, Dept Appl Sci, Kochi, Japan
[6] Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore
基金
日本学术振兴会;
关键词
accretionary prism; East Asian margin tectonics; Izanagi-Pacific ridge; Japanese islands; Shimanto Belt; subduction zone; Western Pacific; SHIMANTO ACCRETIONARY COMPLEX; ARC BASIN SEDIMENTS; FAR-EAST RUSSIA; SIKHOTE-ALIN; SOUTHWEST JAPAN; TECTONIC MELANGE; CENTRAL HOKKAIDO; TRIPLE JUNCTION; SPREADING RIDGE; NORTHEAST JAPAN;
D O I
10.1111/iar.12320
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The belt boundary thrust within the Cretaceous-Neogene accretionary complex of the Shimanto Belt, southwestern Japan, extends for more than similar to 1 000 km along the Japanese islands. A common understanding of the origin of the thrust is that it is an out of sequence thrust as a result of continuous accretion since the late Cretaceous and there is a kinematic reason for its maintaining a critically tapered wedge. The timing of the accretion gap and thrusting, however, coincides with the collision of the Paleocene-early Eocene Izanagi-Pacific spreading ridges with the trench along the western Pacific margin, which has been recently re-hypothesized as younger than the previous assumption with respect to the Kula-Pacific ridge subduction during the late Cretaceous. The ridge subduction hypothesis provides a consistent explanation for the cessation of magmatic activity along the continental margin and the presence of an unconformity in the forearc basin. This is not only the case in southwestern Japan, but also along the more northern Asian margin in Hokkaido, Sakhalin, and Sikhote-Alin. This Paleocene-early Eocene ridge subduction hypothesis is also consistent with recently acquired tomographic images beneath the Asian continent. The timing of the Izanagi-Pacific ridge subduction along the western Pacific margin allows for a revision of the classic hypothesis of a great reorganization of the Pacific Plate motion between similar to 47 Ma and 42 Ma, illustrated by the bend in the Hawaii-Emperor chain, because of the change in subduction torque balance and the Oligocene-Miocene back arc spreading after the ridge subduction in the western Pacific margin.
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页数:15
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