High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey

doi:10.1016/j.lithos.2019.05.038

CORC > 地质与地球物理研究所 > 中国科学院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

	High-temperature chromium isotope fractionation and its implications: Constraints from the Kizildag ophiolite, SE Turkey
	Chen, Chen 1,2; Su, Ben-Xun 1,2; Xiao, Yan 3; Sakyi, Patrick Asamoah 4; He, Xiao-Qing 5; Pang, Kwan-Nang 6; Uysal, Ibrahim 7; Avci, Erdi 8; Qin, Li-Ping 5
刊名	LITHOS
	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
DOI	10.1016/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.
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关键词	PODIFORM CHROMITITES ; LUOBUSA OPHIOLITE ; PERIDOTITE ; SPINEL ; MANTLE ; CR ; OLIVINE ; ORIGIN ; MELTS ; IRON
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000477091500023
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
内容类型	期刊论文
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.