Proto-South China Sea Plate Tectonics Using Subducted Slab Constraints from Tomography

查看全文 作　　者：Jonny [1]Wu;John [1]Suppe

机构地区：[1]Department of Earth and Atmospheric Sciences,University of Houston

出　　处：《Journal of Earth Science》索引2018年第29卷第6期,共15页

摘　　要：The past size and location of the hypothesized proto-South China Sea vanished ocean basin has important plate-tectonic implications for Southeast Asia since the Mesozoic. Here we present new details on proto-South China Sea paleogeography using mapped and unfolded slabs from tomography. Mapped slabs included: the Eurasia-South China Sea slab subducting at the Manila trench; the northern Philippine Sea Plate slab subducting at the Ryukyu trench; and, a swath of detached, subhorizontal, slab-like tomographic anomalies directly under the South China Sea at 450 to 700 km depths that we show is subducted ‘northern proto-South China Sea' lithosphere. Slab unfolding revealed that the South China Sea lay directly above the ‘northern Proto-South China Sea' with both extending 400 to 500 km to the east of the present Manila trench prior to subduction. Our slab-based plate reconstruction indicated the proto-South China Sea was consumed by double-sided subduction, as follows:(1) The ‘northern proto-South China Sea' subducted in the Oligo–Miocene under the Dangerous Grounds and southward expanding South China Sea by in-place ‘self subduction' similar to the western Mediterranean basins;(2) limited southward subduction of the proto-South China Sea under Borneo occurred pre-Oligocene, represented by the 800–900 km deep ‘southern proto-South China Sea' slab. 关键词：断层摄影术中国海平板南方华南海欧亚大陆中生代菲律宾

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Proto-South China Sea Plate Tectonics Using Subducted Slab Constraints from Tomography

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