Zinc isotopic systematics of the South China Sea basalts and implications for its behavior during plate subduction

doi:10.1016/j.chemgeo.2020.119582

	Zinc isotopic systematics of the South China Sea basalts and implications for its behavior during plate subduction
	Liao, Renqiang1,2,3 ; Zhu, Hongli1,2 ; Deng, Jianghong 1,2; Zhang, Lipeng 1,2; Li, He 1,2; Li, Congying 1,2; Liu, He 1,2; Sun, Weidong1,2,3
	2020-05-20
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	541 页码:12
通讯作者	Zhu, Hongli(zhuhongli@qdio.ac.cn)
摘要	Zinc isotopes is a new tracer for deep materials recycling. However, its behavior during plate subduction remains obscure. To address this issue, here we present high precision Zn isotopic compositions (delta delta Zn-66) of basalts recovered from International Ocean Discovery Program (IODP) Expedition 349 in the South China Sea (SCS), which have been influenced by various amounts of subducted materials. Based on (La/Sm)(N) values, these basalts are classified into N-MORB ((La/Sm)(N) < 1) and E-MORB ((La/Sm)(N) >= 1) types. The results show that both of the N-MORB and E-MORB type basalts have similar and homogeneous Zn isotopic compositions with delta Zn-66 ranging from 0.22 to 0.28 parts per thousand and 0.24 to 0.31 parts per thousand, respectively. These values are similar to that of typical MORB reported in the literature (0.28 +/- 0.03 parts per thousand), but are systematically higher than the estimated average value of depleted MORB-type mantle (DMM, 0.18 parts per thousand). The lack of correlations between delta Zn-66 and geochemical indicators of magma differentiation (e.g., MgO, SiO2, CaO/Al2O3) suggests that crystal fractionation has a limited effect on Zn isotope fractionation. Even though the mantle sources of the SCS basalts are clearly affected by various amounts of subducted materials, there are no correlations between delta Zn-66 and indicators of subducted components (e.g., Ce/Pb, Nb/U, Ba/La, Sr-87/Sr-86). This implies that insignificant amount of Zn was transported from the subducting slab to the mantle sources of the SCS basalts, so that subducted materials have a limited effect on Zn isotopic compositions of the SCS basalts studied here. Therefore, the observed offset of delta Zn-66 (similar to 0.10 parts per thousand) between the mantle and the SCS basalts studied here should be primarily controlled by Zn isotope fractionation during mantle partial melting with no need for contributions from subduction materials.
关键词	Zinc isotopes The South China Sea IODP Expedition 349 Partial melting Plate subduction
DOI	10.1016/j.chemgeo.2020.119582
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA22050103] ; Qingdao National Laboratory for Marine Science and Technology[2017ASKJ02] ; Taishan Scholar Program of Shandong[ts201712075] ; AoShan Talents Cultivation Program by Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000537202100006
出版者	ELSEVIER
引用统计	被引频次：8[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/337002/167585
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, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Liao, Renqiang,Zhu, Hongli,Deng, Jianghong,et al. Zinc isotopic systematics of the South China Sea basalts and implications for its behavior during plate subduction[J]. CHEMICAL GEOLOGY,2020,541:12.
APA	Liao, Renqiang.,Zhu, Hongli.,Deng, Jianghong.,Zhang, Lipeng.,Li, He.,...&Sun, Weidong.(2020).Zinc isotopic systematics of the South China Sea basalts and implications for its behavior during plate subduction.CHEMICAL GEOLOGY,541,12.
MLA	Liao, Renqiang,et al."Zinc isotopic systematics of the South China Sea basalts and implications for its behavior during plate subduction".CHEMICAL GEOLOGY 541(2020):12.

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