Lateral evolution of the rift-to-drift transition in the South China Sea: Evidence from multi-channel seismic data and IODP Expeditions 367&368 drilling results
Lateral evolution of the rift-to-drift transition in the South China Sea: Evidence from multi-channel seismic data and IODP Expeditions 367&368 drilling results
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南海裂谷到漂移转换的横向演化：来自多道地震数据和 IODP 探险的证据 367
DOI：
10.1016/j.epsl.2019.115932
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发表时间：
2020-02
影响因子：
5.3
通讯作者：
Li J.B.
中科院分区：
文献类型：
--
作者：
Ding W.W.;Sun Z.;Mohn G.;Nirrengarten M.;Tugend J.;Manatschal G.;Li J.B.
南海边缘是研究控制裂谷到漂移转变的过程和参数的重要自然实验室。高质量的地震数据此前表明大陆和海洋域之间发生了相对急剧的过渡，这一假设最近被 IODP 367 和 368 探险队在南海北部远缘钻探的结果所验证。钻探结果显示该过渡岩心为大洋中脊型玄武岩基底（U1502 场地），而其横向等效物则显示出与大陆的相似性（U1499 场地）。地震数据记录了这一狭窄过渡带（约 15 至 25 公里宽）的横向演化以及与破碎相关的构造岩浆背景。在大陆裂谷的最后阶段，发生了一次短期岩浆事件，侵入了变薄的大陆地壳边缘，引发了地壳破裂和稳态海底扩张的开始。这项工作中记录的过渡域的结构与裂解时被解释为岩浆匮乏或岩浆丰富的结构形成鲜明对比，表明南海大陆边缘位于经典端元岩浆原型之间。我们认为引发大陆破裂的岩浆事件与上升软流圈的减压融化有关。据推测，该事件在地质时间尺度上是快速的（<10 Ma），并且受到高地幔温度的支持。
The South China Sea margins represent a critical natural laboratory to study the processes and parameters controlling the rift-to-drift transition. High quality seismic data previously suggested the occurrence of a relatively sharp transition between the continental and oceanic domains, a hypothesis recently validated by the results of the IODP Expedition 367&368 drilled in the northern South China Sea distal margin. Drilling results in this transition cored Mid-Ocean Ridge type basaltic basement (Site U1502), while its lateral equivalent showed continental affinities (Site U1499). Seismic data document the lateral evolution of this narrow transition zone (∼15 to 25 km wide) and tectono-magmatic context related to breakup. A short-period magmatic event occurred during the latest stage of continental rifting and intruded the edge of the thinned continental crust, triggering crustal breakup and onset of steady-state seafloor spreading. The architecture of the transitional domain documented in this work is in marked contrast with those interpreted as either magma-starved or magma-rich at breakup time, suggesting that the continental margin of the SCS is intermediate between the classical end-member magmatic archetypes. We propose that the magmatic event triggering continental breakup is related to decompression melting linked to the ascending asthenosphere. It is assumed that this event was rapid at geological time scale (<10 Ma) and was favored by a high mantle temperature.
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影响因子：
2.9
作者：
Y. Pin;Z. Di;Zhao-shu Liu
通讯作者：
Y. Pin;Z. Di;Zhao-shu Liu
影响因子：
4.2
作者：
Juliano Magalhães Stica;P. Zalán;André Luiz Ferrari
通讯作者：
Juliano Magalhães Stica;P. Zalán;André Luiz Ferrari
影响因子：
64.8
作者：
R. Whitmarsh;G. Manatschal;T. Minshull
通讯作者：
R. Whitmarsh;G. Manatschal;T. Minshull
影响因子：
4.2
作者：
Peron-Pinvidic, Gwenn;Manatschal, Gianreto;Sawyer, Dale S.
通讯作者：
Sawyer, Dale S.
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
Focused Resistivity;David A. Falvey Director;R. Duce;Curator and Manager Information Services Russell B. Merrill-Curator-and-Manager-Information-Services-Russell-B.-227080
通讯作者：
Focused Resistivity;David A. Falvey Director;R. Duce;Curator and Manager Information Services Russell B. Merrill-Curator-and-Manager-Information-Services-Russell-B.-227080