Significant delta Ca-44/40 variations between carbonate- and clay-rich marine sediments from the Lesser Antilles forearc and implications for mantle heterogeneity

doi:10.1016/j.gca.2020.02.033

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	Significant delta Ca-44/40 variations between carbonate- and clay-rich marine sediments from the Lesser Antilles forearc and implications for mantle heterogeneity
	Zhu, Hongli 1,4,5; Liu, Fang 6; Li, Xin 6; An, Yajun 6; Nan, Xiaoyun 2; Du, Long 3; Huang, Fang 2; Sun, Weidong 1,4,5; Zhang, Zhaofeng 6
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2020-05-01
卷号	276 页码:239-257
关键词	Ca isotopes Marine sediments Lesser Antilles Subduction
ISSN号	0016-7037
DOI	10.1016/j.gca.2020.02.033
通讯作者	Zhang, Zhaofeng(zfzhang@gig.ac.cn)
英文摘要	Calcium isotopes can potentially be used to trace many geological processes. Characterizing the Ca isotopic compositions of marine sediments is a precondition for using Ca isotopes to trace the recycling of marine sediments into the mantle and mantle-derived rocks. The best way to achieve this goal is to investigate different types of marine sediments that are adjacent to subduction zones and would undergo subduction in the future. Here, we present high-precision Ca isotopic data for marine sediments from the Deep Sea Drilling Project (DSDP) Sites 543 and 144 along the Lesser Antilles forearc region, to constrain the Ca isotope signatures of marine sediments with various components and assess their possible effects on delta Ca-44/40 of the local mantle and arc lavas via subduction. Our results show that the delta Ca-44/40 values of these marine sediments vary from 0.10 to 1.21%e and depend on lithology. Carbonate-rich sediments from Site 144 exhibit delta Ca-44/40 values in the range of 0.10-0.58%e with a weighted average value of 0.36%e, which is similar to 0.6%e lower than that of the mantle. In comparison, delta Ca-44/40 of clay-rich sediments from Site 543 range from 0.79 to 1.21%e with a mantle-like mean value of 0.96%e. The data obtained here suggest that carbonate- and clay-rich marine sediments differ significantly both in Ca isotopic compositions and CaO contents. Recycling of these sediments will result in different effects on the isotopic compositions of the local mantle and probably affect the local arc lavas. Specifically, carbonate-rich sediments from Site 144 with high CaO contents and light Ca isotopic compositions can alter the local mantle to lower delta Ca-44/40 signatures, which is expected in the southern Lesser Antilles arc lavas. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41773009] ; National Natural Science Foundation of China[41873002] ; China Postdoctoral Science Foundation[2018M640660] ; State Key Laboratory of Geological Processes and Mineral Resources[GPMR201708] ; Qingdao National Laboratory for Marine Science and Technology[2017ASKJ02] ; National Key R&D Program of China[2016YFC0600408]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000525416100015
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167223]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhang, Zhaofeng
作者单位	1.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 2.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 3.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Hongli,Liu, Fang,Li, Xin,et al. Significant delta Ca-44/40 variations between carbonate- and clay-rich marine sediments from the Lesser Antilles forearc and implications for mantle heterogeneity[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,276:239-257.
APA	Zhu, Hongli.,Liu, Fang.,Li, Xin.,An, Yajun.,Nan, Xiaoyun.,...&Zhang, Zhaofeng.(2020).Significant delta Ca-44/40 variations between carbonate- and clay-rich marine sediments from the Lesser Antilles forearc and implications for mantle heterogeneity.GEOCHIMICA ET COSMOCHIMICA ACTA,276,239-257.
MLA	Zhu, Hongli,et al."Significant delta Ca-44/40 variations between carbonate- and clay-rich marine sediments from the Lesser Antilles forearc and implications for mantle heterogeneity".GEOCHIMICA ET COSMOCHIMICA ACTA 276(2020):239-257.