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《Acta Geologica Sinica》 2006-01
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A Intermediate Type of Cu-Ni Sulfide and V-Ti Magnetite Deposit:Xiangshanxi Deposit,Hami,Xinjiang,China

WANG Yuwang~ 1) , WANG Jingbin~ 1) , WANG Lijuan~ 1) , PENG Xiaoming~ 2) , HUI Weidong~ 2) , QIN Quanxin~ 2) 1) Beijing Institute of Geology for Mineral Resources, Beijing, 100012 2) Xinjiang 704 Geological Team, Hami, 839000  
Both copper-nickel sulfide (CNS) deposit and vanadic titianomagnetite (VTM) deposit are related to mafic-ultramafic rocks and belong to the orthomagmatic mineral deposit, but they rarely coexist on one deposit. The Xiangshanxi deposit is a case of CNS and VTM paragenetic deposit. There exist a complex ore-bearing mafic-ultramafic rockmass in the Xiangshan area with three intrusive stages: gabbro types including green and gray hornblende gabbro and gray hornblende gabbro in the first stage, CNS-bearing ultramafic rocks including pyrolite, Cpx-pyrolite (clinopyroxene pyrolite), lherzolite in the second stage, and Ti-Fe mineralized gabbro dyke (VTM orebody) formed by residual magma in the third stage. All lithochemical indexes and parameters of the Xiangshanxi host mafic-ultramafic rocks such as alkalinity (or alkaline contents), femic ratio (FeO~*/MgO) or mafic index (m/f), magmatic acidity (αsi), calc-alkaline enrichment index (calk/m), and oxygen and sulfur fugacity exhibit dualism and transitional features of typical CNS deposits and VTM deposits. Comparing with other VTM deposits (e.g. Weiya deposit, Xinjiang), magnetite yields higher V and Ti contents while pyrite and chalcopyrite yield higher Co, Ni and Cu contents from the Xiangshanxi deposit, which indicates that fractionation of Cu-Ni-Co series and V-Ti-Fe series is inadequacy. It is suggested that the controlling factor to form the special composite CNS-VTM deposit could owe to its tectonic setting: orogenic belt but not (margin of) craton.
【Fund】: 国家重点基础研究项目(编号2001CB409806)资助成果
【CateGory Index】: P618.2
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