Iron isotope constraints on the lithological heterogeneity of the upper mantle in the South China Sea

doi:10.1016/j.jseaes.2021.104934

	Iron isotope constraints on the lithological heterogeneity of the upper mantle in the South China Sea
	Zhong, Yuan 1; Zhang, Guo-Liang 1,2,3; Lv, Wei-Xin 4; Huang, Fang 4
	2021-10-15
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	220 页码:9
通讯作者	Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn)
摘要	The South China Sea is located at the junction of the Eurasian, Indian, Australian, and Pacific plates, and thus its evolution is complex and the nature of its sub-ridge mantle remains unclear. Here we present new iron (Fe) isotopic data for mid-ocean ridge and intraplate basalts from the South China Sea region, in order to examine the origins of compositional heterogeneity in the sub-ridge mantle beneath the South China Sea. The investigated mid-ocean ridge basalts are from International Ocean Drilling Program Sites U1431 and U1433 in the eastern and southwestern sub-basins of the South China Sea, respectively. The primary melts of the Site U1431 and U1433 basalts have mean delta Fe-56(prim) = +0.06 parts per thousand +/- 0.04 parts per thousand (2SD; n = 10) and +0.02 parts per thousand +/- 0.02 parts per thousand (2SD; n = 3), respectively. The primary melts of the intraplate rocks have highly variable delta Fe-56(prim) (+0.04 parts per thousand to +0.22 parts per thousand). Our new and previously published data show that the delta Fe-56(prim) values and Fe/Mn ratios of the Site U1431 and U1433 basalts are positively correlated (r(2) = 0.42). This result indicates that the heterogeneous Fe isotopic compositions of the studied basalts reflect distinct mantle source lithologies (i.e. pyroxenite and peridotite) that have also been identified from the chemistry of olivine phenocrysts. Co-variations between delta Fe-56(prim) values and Mg-Sr-Nd isotopes for the South China Sea basalts suggest that the end-member components in the sub-ridge mantle include an enriched recycling-related pyroxenitic component with high delta Fe-56 and low delta Mg-26, and a ubiquitous depleted subduction-modified peridotitic component with low delta Fe-56 and high delta Mg-26.
关键词	Mantle heterogeneity Source lithology Mid-ocean ridge basalt Iron isotopes South China Sea
DOI	10.1016/j.jseaes.2021.104934
收录类别	SCI
语种	英语
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[91858206] ; National Natural Science Foundation of China[41876040] ; Taishan Scholars Program of Shandong Province[tsqn201909157]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000709142100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：3[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/337002/176756
专题	深海极端环境与生命过程研究中心
通讯作者	Zhang, Guo-Liang
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 4.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei, 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	Zhong, Yuan,Zhang, Guo-Liang,Lv, Wei-Xin,et al. Iron isotope constraints on the lithological heterogeneity of the upper mantle in the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2021,220:9.
APA	Zhong, Yuan,Zhang, Guo-Liang,Lv, Wei-Xin,&Huang, Fang.(2021).Iron isotope constraints on the lithological heterogeneity of the upper mantle in the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,220,9.
MLA	Zhong, Yuan,et al."Iron isotope constraints on the lithological heterogeneity of the upper mantle in the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 220(2021):9.

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