Subduction of the paleo-Pacific plate recorded by arc volcanism in the South China Sea margin

doi:10.1016/j.gr.2022.05.018

	Subduction of the paleo-Pacific plate recorded by arc volcanism in the South China Sea margin
	Xu, Feng 1,3; Zhang, Guoliang 1,4; Yan, Wen 2,3,5; Zhang, Ji 1,3; Yao, Junhua 1
	2022-10-01
发表期刊	GONDWANA RESEARCH
ISSN	1342-937X
卷号	110 页码:58-72
通讯作者	Zhang, Guoliang([email protected])
摘要	Accretionary prisms along the East Asia continental margin have been interpreted as having formed in response to subduction of the paleo-Pacific plate in the Paleozoic-Mesozoic. However, early arc magmatic records in the East Asia margin have been partly destroyed owing to episodic rifting. Widespread arc magmatism and fold and thrust belts in the South China block have recorded Jurassic and Cretaceous paleo-Pacific plate subduction. In addition, the exterior of the South China continental margin was rifted during the Cenozoic to form the South China Sea, and it is presumed that a relic arc is preserved in the northern and southern South China Sea. In this study, we obtained samples of volcanic rocks through drilling >2000 m in the southern South China Sea. The drill core consisted of interbedded basalts, trachytes, and minor trachy-andesites, with arc-type trace-element patterns. Zircon U-Pb dating of trachyte samples from the drill core yielded clustered ages with an overall weighted mean age of 211. 2 +/- 1.6 Ma, providing robust evidence for the existence of a volcanic arc in the East Asia margin during the Late Triassic. Primitive basalts with MgO > 8.5 wt% have the highest values of eNd(i) and eHf(i) and indicate derivation from Indian-type sub-arc mantle wedge. The increasing Th/Nb with decreasing Nd-Hf isotope values of the basalt samples indicates the incorporation of sediment into the melts. The trachyte samples have enriched K2O and isotopic compositions and are consistent with a sediment-dominated source. On the basis of a comparison with regional magmatic rocks related to plate subduction during Triassic- Jurassic time, the arc volcanic rocks in the southern South China Sea are interpreted to mark a temporal compositional transition in the mantle source, representing steepening subduction of the paleo-Pacific plate during the Late Triassic.(c) 2022 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	Paleo-Pacific plate South China Sea Late Triassic arc volcanism Slab steepening Indian -type mantle
DOI	10.1016/j.gr.2022.05.018
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[91858206]; Strategic Priority Research Program of the Chinese Academy of Sciences[sXDA13010102]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302]; Taishan Scholars Program of Shandong Province[tsqn201909157]; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2022QNLM050201-3]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000828081600005
出版者	ELSEVIER
引用统计	被引频次：6[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/337002/179824
专题	深海极端环境与生命过程研究中心
通讯作者	Zhang, Guoliang
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China 5.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, 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	Xu, Feng,Zhang, Guoliang,Yan, Wen,et al. Subduction of the paleo-Pacific plate recorded by arc volcanism in the South China Sea margin[J]. GONDWANA RESEARCH,2022,110:58-72.
APA	Xu, Feng,Zhang, Guoliang,Yan, Wen,Zhang, Ji,&Yao, Junhua.(2022).Subduction of the paleo-Pacific plate recorded by arc volcanism in the South China Sea margin.GONDWANA RESEARCH,110,58-72.
MLA	Xu, Feng,et al."Subduction of the paleo-Pacific plate recorded by arc volcanism in the South China Sea margin".GONDWANA RESEARCH 110(2022):58-72.

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