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A new model for chromitite formation in ophiolites: Fluid immiscibility

文献类型：期刊论文

作者Su, Benxun1,4,5; Liu, Xia1,4,5; Chen, Chen1,4,5; Robinson, Paul T.4; Xiao, Yan1; Zhou, Meifu2; Bai, Yang1,4,5; Uysal, Ibrahim3; Zhang, Pengfei2
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2020-12-16
页码11
关键词Chromitite Fluid immiscibility Mineral inclusion Ophiolite
ISSN号1674-7313
DOI10.1007/s11430-020-9690-4
英文摘要Although the involvement of hydrous fluids has been widely invoked in formation of podiform chromitites in ophiolites, there is lack of natural evidence to signify the role and mechanism of fluids. In this study, a new model for the genesis of podiform chromitite is proposed on basis of revisits of comprehensive petrological, mineralogical and geochemical results of the well-preserved Kizildag ophiolite and the well-characterized Luobusa chromite deposit. In this model, ascending magmas intruding oceanic lithospheric mantle would presumably form a series of small magma chambers continuously connected by conduits. Tiny chromite nuclei would collect fluids dispersed in such magmas to form nascent droplets. They tend to float upward in the magma chamber and would be easily transported upward by flowing magmas. Chromite-rich droplets would be enlarged via coalescence of dispersed droplets during mingling and circulation in the magma chamber and/or transport in magma conduits. Crystallization of the chromite-rich liquid droplets would proceed from the margin of the droplet inward, leaving liquid entrapped within grains as precursor of mineral inclusions. With preferential upward transportation, immiscible chromite-rich liquids would coalesce to a large pool in a magma chamber. Large volumes of chromite would crystallize in situ, forming podiform chromitite and resulting in fluid enrichment in the chamber. The fluids would penetrate and compositionally modify ambient dunite and harzburgite, leading to significant fractionations of elemental and isotopic compositions between melts and fluids from which dunite and chromitite respectively formed. Therefore, fluid immiscibility during basaltic magma ascent plays a vital role in chromitite formation.
WOS关键词IRON ISOTOPIC FRACTIONATION ; MELT-ROCK INTERACTION ; PODIFORM CHROMITITES ; LUOBUSA OPHIOLITE ; KIZILDAG OPHIOLITE ; OMAN OPHIOLITE ; SOLID INCLUSIONS ; DIAMOND-BEARING ; PARENTAL MAGMAS ; SUTURE ZONE
资助项目National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41973012] ; National Natural Science Foundation of China[41772055]
WOS研究方向Geology
语种英语
WOS记录号WOS:000603534000001
出版者SCIENCE PRESS
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/99977]  
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Su, Benxun
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Univ Hong Kong, Dept Earth Sci, Hong Kong 999077, Peoples R China
3.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Su, Benxun,Liu, Xia,Chen, Chen,et al. A new model for chromitite formation in ophiolites: Fluid immiscibility[J]. SCIENCE CHINA-EARTH SCIENCES,2020:11.
APA Su, Benxun.,Liu, Xia.,Chen, Chen.,Robinson, Paul T..,Xiao, Yan.,...&Zhang, Pengfei.(2020).A new model for chromitite formation in ophiolites: Fluid immiscibility.SCIENCE CHINA-EARTH SCIENCES,11.
MLA Su, Benxun,et al."A new model for chromitite formation in ophiolites: Fluid immiscibility".SCIENCE CHINA-EARTH SCIENCES (2020):11.

入库方式： OAI收割

来源：地质与地球物理研究所

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