Origin of arc-like intraplate volcanism by melting of lithospheric mantle pyroxenite of the South China continental margin

doi:10.1016/j.lithos.2021.106236

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Origin of arc-like intraplate volcanism by melting of lithospheric mantle pyroxenite of the South China continental margin
	Zhao, Zhi-Hua 1,2,4,5; Zhang, Guo-Liang 1,4,5; Wang, Shuai 1,2,4,5; Zhao, Jian-Xin 3
刊名	LITHOS
	2021-09-01
卷号	396 页码:10
关键词	Metasomatism Lithospheric mantle Pyroxenite Plate subduction Hainan plume South China
ISSN号	0024-4937
DOI	10.1016/j.lithos.2021.106236
通讯作者	Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn)
英文摘要	Volcanic arcs usually produce silica-rich magmas that may modify the peridotitic sub-arc mantle, but direct observations on the lithology and geochemistry of the sub-arc lithospheric mantle are rare. An Andean-type arc system is inferred on the continental margin of southeastern China during the Mesozoic time; however, direct petrologic evidence for such an ancient arc is lacking. In this study, we have analyzed whole-rock major and trace elements, Sr-Nd-Pb-Hf isotope, and high-precision olivine geochemistry of the basaltic rocks of the Leizhou Peninsula and Hainan Island, on the South China continental margin. Unlike Hainan Island with only typical ocean island basalt (OIB)-type basalts, the Leizhou Peninsula has volcanic rocks ranging from typical OIB-type basalts to island arc basalt (IAB)-type with enrichment in large-ion lithophile elements and depletion in high-field-strength elements. The IAB-like rocks of the Leizhou Peninsula have less radiogenic Nd and Hf isotopes than the Hainan OIB-type basalts and the sub-continental lithospheric mantle. The IAB-like rocks can be explained by interaction of the Hainan plume with a subduction-derived component based on the plots of Nb/Nb* vs. Ce/Pb, Ba/Nb, Pb/Pb*, and SiO2. Olivine phenocrysts with anomalously high Ni and low Ca and Mn contents are consistent with a pyroxenite-rich mantle source for the IAB-like rocks. We suggest that the pyroxenite-rich mantle component of the IAB-like rocks formed by metasomatic reaction between silica-rich arc melts and the sub-continental lithospheric mantle during an ancient plate subduction event. We suggest that these arc-like volcanic rocks record melting of lithospheric mantle pyroxenite triggered by the Hainan plume. Our results are consistent with an Andean-type active continental margin related to subduction of the paleo-Pacific Plate beneath the southeastern China during the Mesozoic. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101] ; National Natural Science Foundation of China[41876040] ; National Natural Science Foundation of China[91858206] ; Taishan Scholars Program of Shandong Province[tsqn201909157] ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-TD201806]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000670299200002
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177023]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Zhang, Guo-Liang
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Queensland, Sch Earth & Environm Sci, Radiogen Isotope Facil, Brisbane, Qld 4072, Australia 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Zhi-Hua,Zhang, Guo-Liang,Wang, Shuai,et al. Origin of arc-like intraplate volcanism by melting of lithospheric mantle pyroxenite of the South China continental margin[J]. LITHOS,2021,396:10.
APA	Zhao, Zhi-Hua,Zhang, Guo-Liang,Wang, Shuai,&Zhao, Jian-Xin.(2021).Origin of arc-like intraplate volcanism by melting of lithospheric mantle pyroxenite of the South China continental margin.LITHOS,396,10.
MLA	Zhao, Zhi-Hua,et al."Origin of arc-like intraplate volcanism by melting of lithospheric mantle pyroxenite of the South China continental margin".LITHOS 396(2021):10.