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首页> 外文期刊>Journal of geodynamics >Kinematic models for the opening of the South China Sea: An upwelling divergent flow origin
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Kinematic models for the opening of the South China Sea: An upwelling divergent flow origin

机译：南中国海开放的运动学模型：上升流发散

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摘要

We investigate the kinematics of continent breakup and seafloor spreading in response to the upwelling divergent mantle flow using the optimal nearly-analytical discrete method, Modeling results show that a larger upwelling rate (V-z) in the upwelling divergent flow system favors the earlier development of continent breakup and seafloor spreading and the formation of narrow continental rifted margins and mantle exhumation; while a larger half divergent rate (V-z) favors the diffusive lithospheric thinning and the formation of wide continental rifted margins and mantle exhumation. The upwelling divergent flow-driven continent extension is strongly depth-dependent at the proximal margins, but it behaves approximately in a depth-uniform manner at the distal margins. Application of this model to the South China Sea (SCS) demonstrates that: (1) an upwelling flow operation with V-z = 0.3 cm/yr can explain the pre-spreading continent extension of the SCS between ca. 65 Ma and ca. 33 Ma; (2) the followed upwelling divergent flow with V-z = 2.5 cm/yr and V-z =0.3 cm/yr can reproduce the seafloor spreading history at ca. 33-16 Ma in the SCS central oceanic basin; and (3) the post-16 Ma thermal cooling since the cessation of the SCS seafloor spreading contributed similar to 1.2 km to the present-day bathymetry at the relict spreading ridge. The upwelling divergent flow with a high ratio of V-x/V-z was also likely responsible for the occurrence of the very wide rifted continental margins bounded the SCS. We suggest that an upwelling divergent mantle flow played a leading role in the opening of the SCS. (C) 2017 Elsevier Ltd. All rights reserved.
机译：我们使用最佳近解析离散方法研究了响应上涌发散地幔流动的大陆解体和海底扩展的运动学，模拟结果表明，上涌发散流系统中较大的上升速度（Vz）有利于大陆的早期发展。破碎和海底扩散以及大陆裂谷边缘的狭窄和地幔发掘而较大的一半发散率（V-z）则有利于岩石圈的扩散性变薄以及大陆裂谷边缘和地幔发掘的形成。上升流的分流驱动的大陆伸展在近端边缘高度依赖于深度，但在远端边缘处近似以深度均匀的方式表现。该模型在南中国海的应用表明：（1）V-z = 0.3 cm / yr的上升流操作可以解释南海之间在南海之间的前期扩展。大约65 Ma 33毫； （2）V-z = 2.5 cm / yr和V-z = 0.3 cm / yr的后续上升流发散流可以再现海底传播的历史。南海中部海盆33-16 Ma； （3）自南海海底扩展停止以来的16 Ma后热冷却，对今天的遗迹扩展脊的测深贡献了约1.2 km。高比例的V-x / V-z的上升流也可能是造成南海边界极宽的裂谷大陆边缘发生的原因。我们认为上升流的地幔流在SCS的开放中起主导作用。 （C）2017 Elsevier Ltd.保留所有权利。

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