Deep Seismic Evidence of Cenozoic Tectonic Migration in the Western Pacific Back-Arc Area

被引：0
|
作者：
Qi J. [1 ,2 ]
Wu Z. [1 ,2 ]
Zhang X. [1 ,2 ]
Wen Z. [1 ,2 ]
Meng X. [1 ,2 ]
Shang L. [1 ,2 ]
Hou F. [1 ,2 ]
Hu G. [1 ,2 ]
机构：
[1] Qingdao Institute of Marine Geology, Qingdao
[2] Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 07期
关键词：
Back-arc spreading; Deep structure; Lower crust high-velocity zone; Marine geology; Ocean bottom seismometer (OBS); Tectonic migration; Western Pacific back-arc area;
D O I：
10.3799/dqkx.2020.031
中图分类号：
学科分类号：
摘要：
To study the deep crust structure in the back-arc area, we present an active source wide-angle reflection/refraction profile in the back-arc area of Ryukyu Island in the East China Sea in 2015, which passed through the East China Sea shelf basin, the Diaoyu island uplift belt, the southern Okinawa Trough and the Ryukyu Island arc. The 2D velocity structure model obtained by forward modeling and travel tomographic shows that the depth of Moho rises significantly from more than 30 km in the East China Sea shelf to about 16 km in the axis of the Okinawa Trough, and the crustal thickness decreases significantly. A series of discontinuous high-velocity zones with velocity 6.8-7.3 km/s were identified in the lower crust of the back-arc region, which is a remarkable manifestation of mantle upwelling. From the perspective of deep crustal structure, the model clearly shows the tectonic migration from west to east in the back-arc area of the Western Pacific since Cenozoic and confirms that the as thenosphere upwelling in the deep part of the Western Pacific oceanic-continental transition zone transits continuously to the ocean during the back-arc spreading process, forming the tectonic migration from west to east, and driving the episodic extension of the lithosphere. We believe that the Cenozoic tectonic migration to the ocean is a series of back-arc deep-shallow geodynamic effects caused by the retreat of the Pacific subduction zone. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：2495 / 2507
页数：12
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