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Geology,S,Pb,O and H isotopic compositions and Re-Os chronology of Kendenggaoer Cu-Mo deposit in Xinjiang

JIA ZhiYe1,XUE ChunJi1,QU WenJun2,ZHAO Qiang3 and ZHANG Quan1(1 State Key Laboratory of Geological Processes and Mineral Resources;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;2 National Center of Geoanalysis,Beijing 100037,China;3 No.7 Geological Party,Xinjiang Bureau of Geology and Mineral Resources,Wusu 833000,Xinjiang,China)  
Located in Bolohuoluo palaeozoic arc belt,the Kendenggaoer Cu-Mo deposit has aroused much attention among geologists.The ore bodies,in the tabular,laminated and lenticular forms,occur in the outer contact zone between Late Carboniferous granodiorite and Upper Carboniferous carbonate rocks.Metallic minerals in the ore include mainly chalcopyrite and molybdenite,while gangue minerals are mainly diopside and andradite.Sulfide minerals,existing as euhedral or xenomorphic crystals with stockwork and dissemination structures,are distributed in the skarn rocks.Endogenic ore-forming process has obviously experienced two stages of mineralization i.e.,skarn and quartz-sulfide.δ34SV-CDT values of molybdenite and chalcopyrite in the ore vary from-0.55‰ to 1.90‰,concentrated around zero.The ratios of 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb are from 17.963 to 18.256,15.549 to 15.605,and 36.802 to 38.271,respectively,suggesting that metallogenic materials are derived from both upper mantle and lower crust.δ18OH2O V-SMOW and δDH2O V-SMOW values of quartz as well as the water in the inclusions from the Cu-Mo ores of the quartz-sulfide stage are from-2.82‰ to 3.65‰ and from-96‰ to 82‰,respectively,implying that ore-forming fluids were mainly magmatic water,with the mixture of small quantities of precipitate water.Re content of molybdenite in Cu-Mo ores is in the range of 11.13~59.72 μg/g.Isochron dating of Re-Os is(313.9 ± 2.5)Ma,indicating that the metallogenic age is Late Carboniferous.Therefore,the ore-forming process was related to the southward subduction of the Yilianhabierga oceanic basin in the middle of Early Carboniferous.
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