Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific

doi:10.1007/s00343-020-0045-2

	Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific
	Zhu Hongli 1,2,3; Du Long 4; Zhang Zhaofeng 5; Sun Weidong1,2,3,6
	2020-06-07
发表期刊	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	2096-5508
页码	12
通讯作者	Du Long(dulong88@aliyun.com)
摘要	A number of high-temperature processes (e.g., melt-rock reactions, metasomatism, partial melting) can produce significant Ca isotopic fractionation and heterogeneity in the mantle, but the mechanism for such fractionation remains obscure. To investigate the effect of mantle partial melting on Ca isotopic fractionation, we reported high-precision Ca isotopic compositions of depleted mid-ocean ridge basalts (MORBs) from the East Pacific Rise and Ecuador Rift in the northeastern Pacific. The delta Ca-44/40 of these MORB samples exhibit a narrow variation from 0.84 parts per thousand to 0.88 parts per thousand with an average of 0.85 parts per thousand +/- 0.03 parts per thousand, which are similar to those of reported MORBs (0.83 parts per thousand +/- 0.11 parts per thousand) and back-arc basin basalts (BABBs, 0.80 parts per thousand +/- 0.08 parts per thousand) in literature, but are lower than the estimate value for the bulk silicate Earth (BSE, 0.94 parts per thousand +/- 0.05 parts per thousand). The low delta Ca-44/40 signatures of MORB samples in this study cannot be caused by fractional crystallization, since intermediate-mafic differentiation has been demonstrated having only limited effects on Ca isotopic fractionation. Instead, the offset of delta Ca-44/40 between MORBs and the BSE is most likely produced by mantle partial melting. During this process, the light Ca isotopes are preferentially transferred to the melt, while the heavy ones tend to stay in the residue, which is consistent with the fact that delta Ca-44/40 of melt-depleted peridotites increases with partial melting in literature. The behavior of Ca isotopes during mantle partial melting is closely related to the inter-mineral (Cpx and Opx) Ca isotopic fractionation and melting mineral modes. Mantle partial melting is one of the common processes that can induce lower delta Ca-44/40 values in basalts and Ca isotopic heterogeneity in Earth's mantle.
关键词	Ca isotopes mid-ocean ridge basalts (MORBs) mantle partial melting magma differentiation
DOI	10.1007/s00343-020-0045-2
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41773009] ; National Natural Science Foundation of China[41873002] ; Stake Key Laboratory of Geological Processes and Mineral Resources[GPMR201708] ; National Science Foundation for Post-doctoral Scientists of China[2018M640660] ; Taishan Scholar Program of Shandong[TS201712075] ; AoShan Talents Cultivation Program ; Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07]
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000538711200004
出版者	SCIENCE PRESS
引用统计	被引频次：7[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/337002/167694
专题	深海极端环境与生命过程研究中心
通讯作者	Du Long
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 6.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
推荐引用方式 GB/T 7714	Zhu Hongli,Du Long,Zhang Zhaofeng,et al. Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2020:12.
APA	Zhu Hongli,Du Long,Zhang Zhaofeng,&Sun Weidong.(2020).Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,12.
MLA	Zhu Hongli,et al."Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific".JOURNAL OF OCEANOLOGY AND LIMNOLOGY (2020):12.

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