Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang(NW China):Implications for Cu-Ni Mineralization and Tectonic Dynamics

查看全文 作　　者：[1]苏本勋;[1]秦克章;[1]孙赫;[1]唐冬梅;[1]肖庆华;[1]刘平平;Patrick Asamoah [2]Sakyi

机构地区：[1]Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;[2]Department of Geology,University of Ghana,Legon-Accra,Ghana

出　　处：《Journal of Earth Science》索引2012年第23卷第1期,共13页

基　　金：supported by the National Natural Science Foundation of China (Nos. 41030424,41173011);the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KZCX2-YW-107);the China Postdoctoral Science Foundation to Benxun Su 摘　　要：Early Permian mafic-ultramafic complexes in eastern Xinjiang(新疆) are mainly dis-tributed in the Beishan(北山) area,Mid-Tianshan(天山) massif and Jueluotage(觉罗塔格) belt.Sys-tematic compositional mapping of olivines from these Early Permian mafic-ultramafic complexes demonstrates that an apparently spatial distribution and heterogeneous partial melting in the mantle source exists from the Beishan area,across the Mid-Tianshan massif,to the Jueluotage belt from the south to the north.This is probably consistent with the spatial evolutional differences and tectonic fea-tures of these three belts.The decreasing degree of partial melting,as revealed by decreasing Fo con-tents of olivines,from south to north and from east to west reflects the southward subduction of the Paleo-Asian Ocean and the south location of the indistinct mantle plume in the Permian.Simultane-ously,NiO and Fo-mapping in olivine also indicates that sulfide segregation before olivine crystalliza-tion played an important role in Ni-Cu mineralization in the mafic-ultramafic complexes.Olivines with the compositional range of Fo(77-86) and NiO(less than 0.22 wt.%) are more favorable for Ni-Cu sul-fide mineralization. 关键词：铜镍硫化物超镁铁质橄榄石复合物构造动力学映射成分新疆

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Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang(NW China):Implications for Cu-Ni Mineralization and Tectonic Dynamics

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