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

作     者：Jonny Wu John Suppe 无

作者机构：Department of Earth and Atmospheric SciencesUniversity of Houston 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2018年第29卷第6期

页      面：1304-1318页

核心收录：

学科分类：081801[工学-矿产普查与勘探] 070704[理学-海洋地质] 081802[工学-地球探测与信息技术] 0709[理学-地质学] 07[理学] 08[工学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 

主　　题：seismic tomography plate tectonics South China Sea proto-South China Sea subducted slabs Borneo Oligocene–Miocene 

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.