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  2. 地质与地球物理研究所
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  4. 中国科学院矿产资源研究重点实验室
High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey

文献类型：期刊论文

作者Chen, Chen1,2; Su, Ben-Xun1,2; Xiao, Yan3; Sakyi, Patrick Asamoah4; He, Xiao-Qing5; Pang, Kwan-Nang6; Uysal, Ibrahim7; Avci, Erdi8; Qin, Li-Ping5
刊名LITHOS
出版日期2019-10-01
卷号342页码:361-369
关键词Chromite Olivine Cr isotope fractionation Partial melting Fractional crystallization Ophiolite
ISSN号0024-4937
DOI10.1016/j.lithos.2019.05.038
英文摘要Chromium isotope data were obtained from olivine, orthopyroxene and chromite separates of the Kizildag ophiolite, SE Turkey, to investigate the effects of high temperature magma processes on Cr isotope fractionation. Harzburgite in the Kizildag ophiolite has the delta Cr-53 values of -0.14 to -0.12 parts per thousand in chromite, and -0.08 to -0.01 parts per thousand in bulk rocks. These Cr isotope fractionations could be driven by partial melting and metasomatism. The dunite and chromitite samples from the mantle-crust transition zone of the Kizildag ophiolite are cumulates, and their chromite and olivine have delta Cr-53 values of -0.29 to -0.06 parts per thousand and -0.11 to 0.41 parts per thousand, respectively. The delta Cr-53 values of chromite are negatively correlated with the chemical indices of fractional crystallization (e.g., Fe# of chromite), suggesting that Cr isotopes were fractionated during fractional crystallization. In the chromitite, the degree of Cr isotope fractionation increases with fractional crystallization, with 0.23 parts per thousand Cr isotope fractionation occurring at mineral scale. During fractional crystallization, solid phases preferentially incorporate Cr, particularly heavy Cr isotopes, driving the depletion of Cr and enrichment of light Cr isotopes in the evolved melts. The delta Cr-53 values of olivine are higher than the coexisting chromite, which could be explained by the fact that the olivine grains were probably formed earlier than the chromite. The Cr isotopic features of chromite in the podiform chromitite (-0.22 to 0.04 parts per thousand) from the mantle sequence are consistent with the modelled fractional crystallization trend, confirming the magmatic origin of the podiform chromitite. Therefore, a significant Cr isotope fractionation at chromite from the Kizildag ophiolite could be induced by the high-temperature fractional crystallization. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词PODIFORM CHROMITITES ; LUOBUSA OPHIOLITE ; PERIDOTITE ; SPINEL ; MANTLE ; CR ; OLIVINE ; ORIGIN ; MELTS ; IRON
资助项目National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41772055] ; State Key Laboratory of Lithospheric Evolution[201701] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016067]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000477091500023
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/92963]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Chen, Chen; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
4.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Ghana
5.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China
6.Acad Sinica, Inst Earth Sci, Taipei, Taiwan
7.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
8.Istanbul Univ Cerrahpasa, Dept Geol Engn, TR-34320 Istanbul, Turkey
推荐引用方式
GB/T 7714		 Chen, Chen,Su, Ben-Xun,Xiao, Yan,et al. High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey[J]. LITHOS,2019,342:361-369.
APA Chen, Chen.,Su, Ben-Xun.,Xiao, Yan.,Sakyi, Patrick Asamoah.,He, Xiao-Qing.,...&Qin, Li-Ping.(2019).High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey.LITHOS,342,361-369.
MLA Chen, Chen,et al."High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey".LITHOS 342(2019):361-369.

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来源：地质与地球物理研究所

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