Geochemistry of mantle source during the initial expansion and its implications for the opening of the South China Sea

doi:10.1016/j.margeo.2022.106798

	Geochemistry of mantle source during the initial expansion and its implications for the opening of the South China Sea
	Liao, Renqiang1,2 ; Zhu, Hongli1,2,3 ; Li, Congying 1,2,3; Sun, Weidong1,2,3,4
	2022-05-01
发表期刊	MARINE GEOLOGY
ISSN	0025-3227
卷号	447 页码:11
通讯作者	Zhu, Hongli([email protected])
摘要	The South China Sea (SCS) is the largest extensional basin in the western Pacific. Due to the lack of sampling appropriate seafloor rocks, few studies focused on magma evolution in the initial expansion of the SCS, which limits the understanding of the tecto-magmatic evolution of the SCS. Here, we analyzed whole-rock Sr-Nd-Pb-Hf isotopic compositions as well as major and trace element concentrations of basalts recovered from the International Ocean Discovery Program (IODP) Expedition 367 Site U1500B in the northern margin of the SCS, which represents the early-stage formed oceanic crust. Combining with published oceanic crust basalts (e.g., IODP Expedition 349 Site U1431 in the eastern sub-basin, Sites U1433 and U1434 in the southwestern sub-basin) formed in the late spreading, the mantle nature and its evolution during the expansion of the SCS were evaluated. Although Sr-Nd-Pb-Hf isotope compositions of these basalts from the SCS suggest an Indian-type mid-ocean ridge basalts (MORB) mantle, the northern margin basalts from Site U1500B show moderate Pb isotopic compositions between those from the eastern and southwestern sub-basin, suggesting a heterogeneous mantle source beneath the SCS. Modeling calculations based on Sr-Nd-Pb-Hf isotopic compositions show that different amounts of lower continental crust and Hainan plume can account for the heterogeneity of such Indian-type MORB mantle in the SCS. The difference in the involved enriched components in the mantle source might be related to the periodic expansion of the SCS. Based on the geochemical imprints of Hainan plume on the SCS basalts that formed in the initial and late spreading stage, we propose that Hainan plume has a great effect in triggering the opening of the SCS.
关键词	Mantle heterogeneity Hainan plume Lower continental crust IODP South China Sea
DOI	10.1016/j.margeo.2022.106798
收录类别	SCI
语种	英语
资助项目	Shandong Provincial Natural Science Foundation[ZR2021QD098]; Youth Innovation Promotion Association, Chinese Academy of Sciences[2022207]; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA22050103]
WOS研究方向	Geology ; Oceanography
WOS类目	Geosciences, Multidisciplinary ; Oceanography
WOS记录号	WOS:000796842700001
出版者	ELSEVIER
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179381
专题	深海极端环境与生命过程研究中心
通讯作者	Zhu, Hongli
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	深海极端环境与生命过程研究中心
通讯作者单位	深海极端环境与生命过程研究中心
推荐引用方式 GB/T 7714	Liao, Renqiang,Zhu, Hongli,Li, Congying,et al. Geochemistry of mantle source during the initial expansion and its implications for the opening of the South China Sea[J]. MARINE GEOLOGY,2022,447:11.
APA	Liao, Renqiang,Zhu, Hongli,Li, Congying,&Sun, Weidong.(2022).Geochemistry of mantle source during the initial expansion and its implications for the opening of the South China Sea.MARINE GEOLOGY,447,11.
MLA	Liao, Renqiang,et al."Geochemistry of mantle source during the initial expansion and its implications for the opening of the South China Sea".MARINE GEOLOGY 447(2022):11.

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