Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/90311
Title: Origin of the early Cenozoic belt boundary thrust and Izanagi–Pacific ridge subduction in the western Pacific margin
Authors: Kimura, Gaku
Kitamura, Yujin
Yamaguchi, Asuka
Kameda, Jun
Hashimoto, Yoshitaka
Hamahashi, Mari
Keywords: Accretionary Prism
East Asian Margin Tectonics
Science::Geology
Issue Date: 2019
Source: Kimura, G., Kitamura, Y., Yamaguchi, A., Kameda, J., Hashimoto, Y., & Hamahashi, M. (2019). Origin of the early Cenozoic belt boundary thrust and Izanagi–Pacific ridge subduction in the western Pacific margin. Island Arc, 28(5). doi:10.1111/iar.12320
Series/Report no.: Island Arc
Abstract: The belt boundary thrust within the Cretaceous–Neogene accretionary complex of the Shimanto Belt, southwestern Japan, extends for more than ~ 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 ~ 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.
URI: https://hdl.handle.net/10356/90311
http://hdl.handle.net/10220/50479
ISSN: 1038-4871
DOI: http://dx.doi.org/10.1111/iar.12320
Rights: © 2019 The Authors. Island Arc Published by John Wiley & Sons Australia, Ltd. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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