Post-spreading volcanism triggered by CO2 along the South China Sea fossil spreading axis

doi:10.1016/j.lithos.2021.106478

	Post-spreading volcanism triggered by CO2 along the South China Sea fossil spreading axis
	Zhong, Yuan 1; Zhang, Guo-Liang 1,2,3; Zhong, Li-Feng 4; Chen, Li-Hui 5; Wang, Xiao-Jun 5
	2021-12-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	404 页码:9
通讯作者	Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn) ; Zhong, Li-Feng(zhonglifeng@sml-zhuhai.cn)
摘要	The post-spreading seamount chain formed along the fossil ridge of the South China Sea (SCS) consists of carbonated silicate melts and alkaline basalts. These temporally and spatially linked samples give an intriguing case where CO2-rich magmas and associated basaltic rocks occurred upon the ultra-thin oceanic lithosphere, and thus they could carry robust information on the generation of alkaline magma via melting of carbonated mantle source. Here we present magnesium isotopic data (delta Mg-26), and elemental and radiogenic isotope data for the lavas from the on-axis SCS seamount chain. Both the early-and late-stage samples classified based on their formation ages exhibit remarkable delta Mg-26 variations (-0.53 parts per thousand to -0.11 parts per thousand and - 0.38 parts per thousand to -0.23 parts per thousand, respectively). The low-delta Mg-26 signatures found in two groups of the SCS samples indicate a recycled origin for the source carbon inventory. However, the low-delta Mg-26 endmember of the early-stage samples is characterized by low SiO2 and enrichment in rare earth elements (REEs), whereas the late-stage samples display a low-delta Mg-26 end member that produced high-SiO2 and REE-depleted melts. The Mg-Nd isotope systematics suggest that the early stage lavas were yielded by CO2-enhanced melting of sediment-rich oceanic crust (epsilon(Nd) = 4.2), whereas the late stage lavas have sourced the residual and carbon-deficient oceanic crust (epsilon(Nd) = 8.7). Our model demonstrates that the melting of carbonated component can produce compositionally distinct carbonatitic and silicate melts in sequence due to different solidus temperatures. Owe to the relatively thin lithosphere, these two types of melt could individually appear along the fossil ridge of the SCS.
关键词	Magnesium isotope Post-spreading volcanism Carbonated silicate melt Melt-rock reaction South China Sea
DOI	10.1016/j.lithos.2021.106478
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[91858206] ; National Natural Science Foundation of China[41876040] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101] ; Taishan Scholars Pro-gram of Shandong Province[tsqn201909157]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000701864600004
出版者	ELSEVIER
引用统计	被引频次：1[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/337002/176575
专题	深海极端环境与生命过程研究中心
通讯作者	Zhang, Guo-Liang; Zhong, Li-Feng
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 511458, Peoples R China 5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
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; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Zhong, Yuan,Zhang, Guo-Liang,Zhong, Li-Feng,et al. Post-spreading volcanism triggered by CO2 along the South China Sea fossil spreading axis[J]. LITHOS,2021,404:9.
APA	Zhong, Yuan,Zhang, Guo-Liang,Zhong, Li-Feng,Chen, Li-Hui,&Wang, Xiao-Jun.(2021).Post-spreading volcanism triggered by CO2 along the South China Sea fossil spreading axis.LITHOS,404,9.
MLA	Zhong, Yuan,et al."Post-spreading volcanism triggered by CO2 along the South China Sea fossil spreading axis".LITHOS 404(2021):9.

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