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Characteristics of crustal variation and extensional break-up in the western pacific back-arc region based on a wide-angle seismic profile

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Geoscience Frontiers 2021年第3期12卷 296-313页

作者： Jianghao Qi Xunhua Zhang Zhiqiang Wu XiangjunMeng Luning Shang Yang Li Xingwei Guo Fanghui Hou Enyuan He QiangWang Qingdao Institute of Marine Geology QingdaoChina Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdaoChina Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhouChina School of Resource Engineering Longyan UniversityLongyanChina

The marginal sea and back-arc basins in the western pacific Ocean have become the focus of tectonics due to their unique tectonic *** understand the deep crustal structure in the back-arc region,we present a 545-kmlong active-source ocean bottom seismometer(OBS)wide-angle reflection/refraction profile in the East China *** P wave velocity model shows that the Moho depth rises significantly,from approximately 30 km in the East China Sea shelf to approximately 16 km in the axis of the Okinawa *** lower crustal high-velocity zone(HVZ)in the southern Okinawa Trough,with V_(p) of 6.8-7.3 km/s,is a remarkable manifestation of the mantle material upwelling and accretion to the lower *** confirms that the lower crustal high-velocity mantle accretion is developed in the southern Okinawa *** the process of back-arc extension,the crustal structure of the southern Okinawa Trough is completely invaded and penetrated by the upper mantle material in the axis *** some areas of the southern central graben,the crust may has broken up and entered the initial stage of seafloor *** discontinuous HVZs in the lower crust in the back-arc region also indicate the migration of spreading centers in the back-arc region since the *** asthenosphere material upwelling in the continent-ocean transition zone is constantly driving the lithosphere eastward for episodic extension,and is causing evident tectonic migration in the western pacific back-arc region.

关键词： western pacific back-arc region back-arc extension Wide-angle reflection/refraction seismic profile High-velocity zone Plate subduction retreat Tectonic migration

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