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Zircon U-Pb geochronology and geochemistry of Hanzheganeng Cu-Au deposit in West Junggar,Xinjiang: Implications for magma source and metallogenic tectonic setting.

GUO ZhengLin1,2,LI JinXiang1,QIN KeZhang1**,DONG LianHui1,3,GUO XuJi2,TANG DongMei1 and DU XingWang21.Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,CAS,Beijing 100029,China2.No.706 Geological Party,Xinjiang Geoexploration Bureau for Nonferrous Metals,Altay 839000,China3.Xinjiang Bureau of Geology and Mineral Resouces,Uramuqi 830000,China  
Hanzheganeng Cu-Au deposit,located in northwestern margin of Junggar,is a newly discovered porphyry copper deposit with great potential.Magmatic emplacement activity is mainly diorite in the early stage,and is mainly granodiorite and moznogranite porphyry in the late stage.Porphyraceous quartz monzonite yields a LA-ICP-MS zircon U-Pb age of 343.6±5.7Ma~345.3±8.3Ma,and monzogranite porphyry yields a zircon age of 334.9±7.3Ma~336.4±7.5Ma.These ages indicate that there is an Early Carboniferous important magmatic-hydrothermal Cu-Au mineralization event in Sawuer region of West Junggar.Major elements of granodiorite,quartz monzonite,diorite porphyrite,diorite,and monzogranite porphyry show a consistent evolution trend,indicating that they may be the product of the same magmatic evolution.And their geochemical characteristics of enriching in large-ion lithophile elements(LILE: such as Rb,Ba,K,Sr) and more mobile incompatible elements(such as: U,Th),relatively depleting in high field strength elements(HFSE: such as Nb,Ta,Ti) show that they have the characteristics of arc magma.Their isotopic characteristics with 87Sr/86Sri ratio of 0.7033~0.7037,143Nd/144Nd ratio of 0.512538~ 0.512579,εNd(t) value of +6.7~+7.5,indicate their magma source is an analogy of the depleted mantle.And they have young Nd two-stage model age of 488~553Ma,indicating that Hanzheganeng magmatic rocks may be derived from juvenile basaltic lower crust differentiated from the depleted mantle source.The formation age of Hanzheganeng Cu-Au deposit is significantly earlier than the formation age of A-type granites(290~300Ma) in this region,combined with trace element characteristics,suggest this deposit was formed in accretional arc setting,and Sawuer district have favorable metallogenetic conditions for porphyry Cu-Au deposits.
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