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Iron isotopic fractionation and origin of chromitites in the paleo-Moho transition zone of the Kop ophiolite, NE Turkey

文献类型：期刊论文

作者Zhang, Peng-Fei1; Zhou, Mei-Fu1; Su, Ben-Xun2; Uysal, Ibrahim3; Robinson, Paul T.1; Avci, Erdi3; He, Yong-Sheng4
刊名LITHOS
出版日期2017
卷号268页码:65-75
关键词Magnesiochromite Kop Ophiolite Moho Transition Zone Fe Isotopic Fractionation Magma Mixing
ISSN号0024-4937
DOI10.1016/j.lithos.2016.10.019
文献子类Article
英文摘要The paleo-Moho transition zone (MTZ) of the Kop ophiolite in NE Turkey is mainly composed of dunites, which are locally interlayered with chromitites and contain minor relics of harzburgites. Large Fe isotopic variations were observed for magnesiochromite (-0.14 to 0.06 parts per thousand) and olivine (-0.12 to 0.14 parts per thousand) from the MTZ rocks. In individual samples, magnesiochromite has lighter Fe isotopic compositions than olivine, which was probably caused by subsolidus Mg-Fe exchange between them. Both magnesiochromite and olivine display an increasing trend of delta Fe-56 along a profile from chromitite to dunite. This trend reflects continuous fractional crystallization in a magma chamber, which resulted in heavier Fe isotopes concentrated in the evolved magmas. In each cumulate cycle of chromitite and dunite, dunite was formed from relatively evolved melts after massive precipitation of magnesiochromite. Mixing of more primitive and evolved melts in the magma chamber was a potential mechanism for triggering the crystallization of magnesiochromite, generating chromitite layers in the cumulate pile. Before mixing happened, the primitive melts had reacted with mantle harzburgites during their ascendance; whereas the evolved melts may lie on the olivine-chromite cotectic near the liquidus field of pyroxene. Variable degrees of magma mixing and differentiation are expected to generate melts with different delta Fe-56 values, accounting for the Fe isotopic variations of the Kop MTZ. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词NORTHERN OMAN OPHIOLITE ; MELT-ROCK INTERACTION ; MAGMATIC DIFFERENTIATION ; PODIFORM CHROMITITES ; HIGH-TEMPERATURE ; OXYGEN FUGACITY ; UPPER-MANTLE ; EXPERIMENTAL CALIBRATION ; LITHOSPHERIC MANTLE ; LAYERED INTRUSIONS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000392680400005
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41473038) ; Chinese Academy of Sciences(XDB03010203 ; XDB03010800) ; National Natural Science Foundation of China(41473038) ; Chinese Academy of Sciences(XDB03010203 ; XDB03010800) ; National Natural Science Foundation of China(41473038) ; Chinese Academy of Sciences(XDB03010203 ; XDB03010800) ; National Natural Science Foundation of China(41473038) ; Chinese Academy of Sciences(XDB03010203 ; XDB03010800)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53144]  
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Zhou, Mei-Fu; He, Yong-Sheng
作者单位1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Peng-Fei,Zhou, Mei-Fu,Su, Ben-Xun,et al. Iron isotopic fractionation and origin of chromitites in the paleo-Moho transition zone of the Kop ophiolite, NE Turkey[J]. LITHOS,2017,268:65-75.
APA Zhang, Peng-Fei.,Zhou, Mei-Fu.,Su, Ben-Xun.,Uysal, Ibrahim.,Robinson, Paul T..,...&He, Yong-Sheng.(2017).Iron isotopic fractionation and origin of chromitites in the paleo-Moho transition zone of the Kop ophiolite, NE Turkey.LITHOS,268,65-75.
MLA Zhang, Peng-Fei,et al."Iron isotopic fractionation and origin of chromitites in the paleo-Moho transition zone of the Kop ophiolite, NE Turkey".LITHOS 268(2017):65-75.

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来源：地质与地球物理研究所

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