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Base metal mineral segregation and Fe-Mg exchange inducing extreme compositions of olivine and chromite from the Xiadong Alaskan-type complex in the southern part of the Central Asian Orogenic Belt

文献类型：期刊论文

作者Bai, Yang1,2; Su, Ben-Xun1,3; Chen, Chen1,2; Yang, Sai-Hong1; Liang, Zi1,2; Xiao, Yan1; Qin, Ke-Zhang3; Malaviarachchi, Sanjeewa P. K.4
刊名ORE GEOLOGY REVIEWS
出版日期2017-11-01
卷号90页码:184-192
关键词Alaskan-type Complex Olivine Chromite Base Metal Mineral Segregation Fe-mg Exchange
ISSN号0169-1368
DOI10.1016/j.oregeorev.2017.01.023
文献子类Article
英文摘要The Xiadong Alaskan-type complex shares much in common with typical Alaskan-type complexes worldwide, while showing some unique features in terms of mineral compositions. Olivine from the Xiadong dunites is characterized by extremely high Fo component of 91.7-96.7 and anomalously negative correlation of Fo with NiO, while chromite is featured by high 100 x Fe3+/(Fe3+ + Cr + Al) (>70), high 100 x Fe2+/(Fe2+ + Mg) (>70), high 100 x Cri(Cr + Al) (>90), low Mn0 (<0.6 wt%) and TiO2 contents (<0.5 wt%). To investigate these particular features, we conducted petrographic observation and mineral composition analyses for the Xiadong dunite. A number of Fe and/or Ni sulfides and alloys occurring as inclusions in olivine and chromite indicate that base metal mineral segregation took place prior to crystallization of olivine and chromite and probably induced Fe and Ni depletions in olivine. The FeO and MgO variations in profile analyses from chromite to adjacent olivine are compatible with Fe-Mg exchange. The diffusion mechanism of Fe from olivine to chromite and Mg from chromite to olivine may have elevated both Fo of olivine and 100 x Fe2+/(Mg + Fe2+) ratio of chromite and further enhanced the decoupling of Fo and NiO in olivine. We thus suggest that base metal mineral segregation and Fe-Mg exchange play important roles in the extreme compositions of the Xiadong dunite. The Ni depletion of olivine and degree of Fe-Mg exchange between olivine and chromite may be used as indicators of mineralization in maficultramafic intrusions. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词MAFIC-ULTRAMAFIC COMPLEXES ; PLATINUM-GROUP ELEMENTS ; BRITISH-COLUMBIA ; TRACE-ELEMENTS ; SILICATE MELT ; MANTLE WEDGE ; DUKE ISLAND ; VOISEYS BAY ; NW CHINA ; SULFIDE
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000423248600013
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82596]  
专题中国科学院地质与地球物理研究所
通讯作者Bai, Yang; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Sch Earth Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
4.Univ Peradeniya, Fac Sci, Dept Geol, Peradeniya 20400, Sri Lanka
推荐引用方式
GB/T 7714		 Bai, Yang,Su, Ben-Xun,Chen, Chen,et al. Base metal mineral segregation and Fe-Mg exchange inducing extreme compositions of olivine and chromite from the Xiadong Alaskan-type complex in the southern part of the Central Asian Orogenic Belt[J]. ORE GEOLOGY REVIEWS,2017,90:184-192.
APA Bai, Yang.,Su, Ben-Xun.,Chen, Chen.,Yang, Sai-Hong.,Liang, Zi.,...&Malaviarachchi, Sanjeewa P. K..(2017).Base metal mineral segregation and Fe-Mg exchange inducing extreme compositions of olivine and chromite from the Xiadong Alaskan-type complex in the southern part of the Central Asian Orogenic Belt.ORE GEOLOGY REVIEWS,90,184-192.
MLA Bai, Yang,et al."Base metal mineral segregation and Fe-Mg exchange inducing extreme compositions of olivine and chromite from the Xiadong Alaskan-type complex in the southern part of the Central Asian Orogenic Belt".ORE GEOLOGY REVIEWS 90(2017):184-192.

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来源：地质与地球物理研究所

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