西太平洋弧后地区新生代构造迁移的深部地震证据

祁江豪; 吴志强; 张训华; 温珍河; 孟祥君; 尚鲁宁; 侯方辉; 胡刚

doi:10.3799/dqkx.2020.031

Volume 45 Issue 7

Jul. 2020

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Article Navigation > Earth Science > 2020 > 45(7): 2495-2507

Qi Jianghao, Wu Zhiqiang, Zhang Xunhua, Wen Zhenhe, Meng Xiangjun, Shang Luning, Hou Fanghui, Hu Gang, 2020. Deep Seismic Evidence of Cenozoic Tectonic Migration in the Western Pacific Back-Arc Area. Earth Science, 45(7): 2495-2507. doi: 10.3799/dqkx.2020.031

Citation:

Qi Jianghao, Wu Zhiqiang, Zhang Xunhua, Wen Zhenhe, Meng Xiangjun, Shang Luning, Hou Fanghui, Hu Gang, 2020. Deep Seismic Evidence of Cenozoic Tectonic Migration in the Western Pacific Back-Arc Area. Earth Science, 45(7): 2495-2507. doi: 10.3799/dqkx.2020.031

Citation:

Qi Jianghao, Wu Zhiqiang, Zhang Xunhua, Wen Zhenhe, Meng Xiangjun, Shang Luning, Hou Fanghui, Hu Gang, 2020. Deep Seismic Evidence of Cenozoic Tectonic Migration in the Western Pacific Back-Arc Area. Earth Science, 45(7): 2495-2507. doi: 10.3799/dqkx.2020.031

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

doi: 10.3799/dqkx.2020.031

Qi Jianghao^{1, 2
,
,},
Wu Zhiqiang^{1, 2
,
,
,},
Zhang Xunhua^{1, 2},
Wen Zhenhe^{1, 2},
Meng Xiangjun^{1, 2},
Shang Luning^{1, 2},
Hou Fanghui^{1, 2},
Hu Gang^{1, 2}

1.
Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China

Received Date: 2020-02-20
Publish Date: 2020-07-15

Abstract

Abstract

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.
- Western Pacific back-arc area,
- back-arc spreading,
- ocean bottom seismometer (OBS),
- deep structure,
- lower crust high-velocity zone,
- tectonic migration,
- marine geology

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References(65)

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

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