| Oceanic crustal structures and temporal variations of magmatic budget during seafloor spreading in the East Sub-basin of the South China Sea | |
| Yu, Junhui1,2,3; Yan, Pin1,2,3; Qiu, Yan4; Delescluse, Matthias5; Huang, Wenkai4; Wang, Yanlin1,2,3 | |
| 2021-06-01 | |
| 发表期刊 | MARINE GEOLOGY
 |
| ISSN | 0025-3227 |
| 卷号 | 436页码:10 |
| 通讯作者 | Yan, Pin(yanpin@scsio.ac.cn) ; Wang, Yanlin(yanlinw@scsio.ac.cn) |
| 摘要 | Following magma-poor continental rifting, the South China Sea (SCS) experienced seafloor spreading from similar to 33 Ma to similar to 15 Ma with an intervening southward ridge jump at similar to 25 Ma, generating the oceanic East, Northwest and Southwest Sub-basins. However, the magmatic processes during spreading remain poorly known owing to the lack of oceanic crustal images. Here we present a composite profile comprising three seismic lines that run from the northern continent-ocean transition (COT) to the extinct spreading center of the East Sub-basin to reveal the crustal structures. In the northernmost oceanic portion, the first oceanic crust featuring rough basement with numerous faults, and diffuse and weak Moho reflector, is only 3.9-4.5 km thick, implying relatively low magmatic budget and protracted tectonic extension continued from the magma-poor continental rifting to initial spreading. From the northern COT ocean-ward to the abandoned ridge where the jump event occurred, the basement becomes smooth with subdued faults. The Moho reflector tends to be continuous and strong, and the igneous crust gradually becomes thick (locally up to 8.4 km), suggesting considerably increasing magmatic budget during the early spreading stage. However, in the central portion spanning from the abandoned ridge to the extinct spreading axis, the basement becomes rough with crustal faults again. And the crust gradually becomes thin, to only 3.7 km at the extinct spreading center where a deep median valley is still visible, though severely altered by post-spreading volcanism, implying decreasing magmatic budget and increasing tectonic extension during the late spreading stage. Therefore, the crustal structure variations in the East Sub-basin reflects a prominent increasing to decreasing change of magmatic budget during spreading with the peak around the intervening ridge jump. Thin, tectonized crust and deep median valley around the extinct spreading center further support slow seafloor spreading during the last spreading stage of the SCS which ended at similar to 15-16 Ma, and also suggest that magma contribution from the Hainan mantle plume might be very limited if any. |
| 关键词 | South China Sea Ridge jump Variation of oceanic crust Magmatic budget Tectonic extension |
| DOI | 10.1016/j.margeo.2021.106475 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | CAS Special Research Assistant Funding Program ; Open Fund of Key Laboratory of Marine Geology and Environment, CAS[MGE2020KG01] ; National Natural Science Foundation of China[U1901217] ; National Natural Science Foundation of China[91855101] ; National Natural Science Foundation of China[41876052] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0104] ; Special Support Program for Cultivating High-level Talents in Guangdong Province[2019BT02H594] |
| WOS研究方向 | Geology ; Oceanography |
| WOS类目 | Geosciences, Multidisciplinary ; Oceanography |
| WOS记录号 | WOS:000652406000008 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/176781 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Yan, Pin; Wang, Yanlin |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China 4.Guangzhou Marine Geol Survey, Minist Nat Resources, Guangzhou 510075, Peoples R China 5.PSL Res Univ, Lab Geol, Ecole Normale Super, CNRS UMR 8538, F-75005 Paris, France |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Yu, Junhui,Yan, Pin,Qiu, Yan,et al. Oceanic crustal structures and temporal variations of magmatic budget during seafloor spreading in the East Sub-basin of the South China Sea[J]. MARINE GEOLOGY,2021,436:10. |
| APA | Yu, Junhui,Yan, Pin,Qiu, Yan,Delescluse, Matthias,Huang, Wenkai,&Wang, Yanlin.(2021).Oceanic crustal structures and temporal variations of magmatic budget during seafloor spreading in the East Sub-basin of the South China Sea.MARINE GEOLOGY,436,10. |
| MLA | Yu, Junhui,et al."Oceanic crustal structures and temporal variations of magmatic budget during seafloor spreading in the East Sub-basin of the South China Sea".MARINE GEOLOGY 436(2021):10. |
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