Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites

doi:10.1016/j.chemgeo.2019.06.010

	Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites
	Kang, Jin-Ting 1,2; Ionov, Dmitri A.1,3; Zhu, Hong-Li 1,4; Liu, Fang 1; Zhang, Zhao-Feng 1; Liu, Zhe 1; Huang, Fang 2
	2019-10-05
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	524 页码:272-282
通讯作者	Zhang, Zhao-Feng([email protected]) ; Huang, Fang([email protected])
摘要	To investigate the effects of melt metasomatism on Ca isotope fractionation in the upper mantle, we report data for xenoliths of mantle rocks including composite peridotites (lherzolites and coexisting pyroxenite veins), wehrlites as well as eclogites and their minerals. The delta Ca-44/40 in clinopyroxenes (cpx) are similar to 0.3 parts per thousand lower than in coexisting garnets in eclogites from the Udachnaya kimberlite in the central Siberian craton, likely due to equilibrium isotope fractionation controlled by mineral structure. The delta Ca-44/40 in the pyroxenite veins (cumulates from mafic melts) and their host peridotites from Tariat in Mongolia range from 0.88 parts per thousand to 1.05 parts per thousand and are close to the Bulk Silicate Earth (BSE) value (0.95 +/- 0.05 parts per thousand). Calcium-Fe-rich low-orthopyroxene lherzolites and wehrlites (LW series) from Tok in the SE Siberian craton were formed by reaction of lherzolites and harzburgites with percolating silica-undersaturated melts. The delta(44/40) Ca (0.65 parts per thousand-0.87 parts per thousand) in the Tok peridotites are negatively correlated with Ca/Al, (Gd/Yb)(N) and positively with Mg# (indices of melt-rock reaction degrees). The delta Ca-44/40 ratios in the LW series rocks are lighter than the BSE estimate, and similar to delta Ca-44/40 in their host basalt and an olivine-cpx cumulate (0.70 parts per thousand-0.76 parts per thousand). These observations on the Tok suite can be explained by reaction of refractory peridotite protoliths with melts derived from mixed eclogite and peridotite sources. Overall, the delta Ca-44/40 variations in eclogites, wehrlites, and various rocks related to silicate melts in the mantle, demonstrate that melt metasomatism plays an important role in producing mantle Ca isotope heterogeneity. The data for coexisting garnet and cpx in eclogites outline a potential for garnet to affect Ca isotope inter-mineral and solid-melt fractionation in the mantle.
关键词	Ca isotopes Mantle metasomatism Wehrlite Eclogite Pyroxenite
DOI	10.1016/j.chemgeo.2019.06.010
收录类别	SCI
语种	英语
资助项目	NSF[EAR-1009494]; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000]; National Science Foundation of China[41873002]; National Science Foundation of China[41373007]; National Science Foundation of China[41325011]; National Science Foundation of China[41573017]; National Science Foundation of China[41773009]; 111 Plan; CAS (Chinese Academy of Sciences) President's International Fellowship Initiative (PIFI) in 2017-19[2017VCA0009]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000493088300019
出版者	ELSEVIER
引用统计	被引频次：32[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/337002/165080
专题	深海极端环境与生命过程研究中心
通讯作者	Zhang, Zhao-Feng; Huang, Fang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 3.Univ Montpellier, Geosci Montpellier, F-34095 Montpellier, France 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Kang, Jin-Ting,Ionov, Dmitri A.,Zhu, Hong-Li,et al. Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites[J]. CHEMICAL GEOLOGY,2019,524:272-282.
APA	Kang, Jin-Ting.,Ionov, Dmitri A..,Zhu, Hong-Li.,Liu, Fang.,Zhang, Zhao-Feng.,...&Huang, Fang.(2019).Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites.CHEMICAL GEOLOGY,524,272-282.
MLA	Kang, Jin-Ting,et al."Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites".CHEMICAL GEOLOGY 524(2019):272-282.

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