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Coupled extremely light Ca and Fe isotopes in peridotites

文献类型：期刊论文

作者Zhao, Xinmiao1; Zhang, Zhaofeng2; Huang, Shichun3; Liu, Yufei2; Li, Xin2; Zhang, Hongfu1,4
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2017-07-01
卷号208页码:368-380
关键词Ca isotopes Fe-rich peridotites Melt percolation Lithospheric mantle North China Craton
ISSN号0016-7037
DOI10.1016/j.gca.2017.03.024
文献子类Article
英文摘要Large metal stable isotopic variations have been observed in both extraterrestrial and terrestrial samples. For example, Ca exhibits large mass-dependent isotopic variation in terrestrial igneous rocks and mantle minerals (on the order of similar to 2% variation in Ca-44/Ca-40). A thorough assessment and understanding of such isotopic variations in peridotites provides important constraints on the evolution and compositon of the Earth's mantle. In order to better understand the Ca and Fe isotopic variations in terrestrial silicate rocks, we report Ca isotopic compositions in a set of peridotitic xenoliths from North China Craton (NCC), which have been studied for Fe isotopes. These NCC peridotites have large Ca and Fe isotopic variations, with delta(44/40) Ca ranging from -0.08 to 0.92 (delta value relative to SRM915a) and delta Fe-57/54 (delta value relative to IRMM-014) ranging from -0.61 to 0.16, and these isotopic variations are correlated with large Mg# (100 x Mg/(Mg + Fe) molar ratio) variation, ranging from 80 to 90. Importantly, NCC Fe-rich peridotites have the lowest Ca-44/Ca-40 and Fe-57/Fe-54 ratios in all terrestrial silicate rocks. In contrast, although ureilites, mantle rocks from a now broken differentiated asteroid(s), have large Mg# variation, from 70 to 92, they have very limited delta Fe-57/Fe-54 variation (0.03-0.21, delta value relative to IRMM-014). Our model calculations show that the coupled extremely light Ca-Fe isotopic signatures in NCC Fe-rich peridotites most likely reflect kinetic isotopic fractionation during melt-peridotite reaction on a timescale of several to 10(4) years. In addition, our new data and compiled literature data show a possible compositional effect on the inter-mineral Ca isotopic fractionation between co-existing clinopyroxene and orthopyroxene pairs. (C) 2017 Elsevier Ltd. All rights reserved.
WOS关键词NONTRADITIONAL STABLE-ISOTOPES ; NORTH CHINA CRATON ; LITHOSPHERIC MANTLE ; CALCIUM ISOTOPES ; MELT PERCOLATION ; EASTERN CHINA ; MAGMATIC DIFFERENTIATION ; ORTHO-PYROXENE ; PARENT BODY ; FRACTIONATION
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000402489500020
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Natural Science Foundation of China(41673021 ; Natural Science Foundation of China(41673021 ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; National Science Foundation(EAR-1524387) ; National Science Foundation(EAR-1524387) ; 41373007 ; 41373007 ; 41373041 ; 41373041 ; 41490632 ; 41490632 ; 91328204) ; 91328204) ; Natural Science Foundation of China(41673021 ; Natural Science Foundation of China(41673021 ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; National Science Foundation(EAR-1524387) ; National Science Foundation(EAR-1524387) ; 41373007 ; 41373007 ; 41373041 ; 41373041 ; 41490632 ; 41490632 ; 91328204) ; 91328204) ; Natural Science Foundation of China(41673021 ; Natural Science Foundation of China(41673021 ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; National Science Foundation(EAR-1524387) ; National Science Foundation(EAR-1524387) ; 41373007 ; 41373007 ; 41373041 ; 41373041 ; 41490632 ; 41490632 ; 91328204) ; 91328204) ; Natural Science Foundation of China(41673021 ; Natural Science Foundation of China(41673021 ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Lithospheric Evolution(Y610201102) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-KF-13-03) ; National Science Foundation(EAR-1524387) ; National Science Foundation(EAR-1524387) ; 41373007 ; 41373007 ; 41373041 ; 41373041 ; 41490632 ; 41490632 ; 91328204) ; 91328204)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52873]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zhao, Xinmiao; Zhang, Zhaofeng; Huang, Shichun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
3.Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA
4.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Xinmiao,Zhang, Zhaofeng,Huang, Shichun,et al. Coupled extremely light Ca and Fe isotopes in peridotites[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017,208:368-380.
APA Zhao, Xinmiao,Zhang, Zhaofeng,Huang, Shichun,Liu, Yufei,Li, Xin,&Zhang, Hongfu.(2017).Coupled extremely light Ca and Fe isotopes in peridotites.GEOCHIMICA ET COSMOCHIMICA ACTA,208,368-380.
MLA Zhao, Xinmiao,et al."Coupled extremely light Ca and Fe isotopes in peridotites".GEOCHIMICA ET COSMOCHIMICA ACTA 208(2017):368-380.

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来源：地质与地球物理研究所

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