气候变化领域集成服务门户(CCPortal): Where Are the Proto-South China Sea Slabs? SE Asian Plate Tectonics and Mantle Flow History From Global Mantle Convection Modeling

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DOI	10.1029/2020JB019758
	Where Are the Proto-South China Sea Slabs? SE Asian Plate Tectonics and Mantle Flow History From Global Mantle Convection Modeling
	Lin Y.-A.; Colli L.; Wu J.; Schuberth B.S.A.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	The plate tectonic history of the hypothesized “proto-South China Sea” (PSCS) ocean basin and surrounding SE Asia since Cenozoic times is controversial. We implement four diverse proto-South China Sea plate reconstructions into global geodynamic models to constrain PSCS plate tectonics and possible slab locations. Our plate reconstructions consider the following: southward versus double-sided PSCS subduction models; earlier (Eocene) or later (late Oligocene) initiation of Borneo counterclockwise rotations; and larger or smaller reconstructed Philippine Sea plate sizes. We compare our modeling results against tomographic images by accounting for mineralogical effects and the finite resolution of seismic tomography. All geodynamic models reproduce the tomographically imaged Sunda slabs beneath Peninsular Malaysia, Sumatra, and Java. Southward PSCS subduction produces slabs beneath present Palawan, northern Borneo, and offshore Palawan. Double-sided PSCS subduction combined with earlier Borneo rotations uniquely reproduces subhorizontal slabs under the southern South China Sea (SCS) at ~400 to 700 km depths; these models best fit seismic tomography. A smaller Philippine Sea (PS) plate with a ~1,000-km-long restored Ryukyu slab was superior to a very large PS plate. Considered together, our four end-member plate reconstructions predict that the PSCS slabs are now at <900 km depths under present-day Borneo, the SCS, the Sulu and Celebes seas, and the southern Philippines. Regardless of plate reconstruction, we predict (1) mid-Cenozoic passive return-flow upwellings under Indochina; and (2) late Cenozoic downwellings under the SCS that do not support a deep-origin “Hainan plume.” Modeled Sundaland dynamic topography strongly depends on the imposed plate reconstructions, varying by almost 1 km. © 2020. The Authors.
英文关键词	dynamic topography; geodynamic model; plate tectonics; seismic tomography; South China Sea; Southeast Asia
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187462
作者单位	Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, United States; Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany
推荐引用方式 GB/T 7714	Lin Y.-A.,Colli L.,Wu J.,et al. Where Are the Proto-South China Sea Slabs? SE Asian Plate Tectonics and Mantle Flow History From Global Mantle Convection Modeling[J],2020,125(12).
APA	Lin Y.-A.,Colli L.,Wu J.,&Schuberth B.S.A..(2020).Where Are the Proto-South China Sea Slabs? SE Asian Plate Tectonics and Mantle Flow History From Global Mantle Convection Modeling.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Lin Y.-A.,et al."Where Are the Proto-South China Sea Slabs? SE Asian Plate Tectonics and Mantle Flow History From Global Mantle Convection Modeling".Journal of Geophysical Research: Solid Earth 125.12(2020).