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《Acta Geoscientica Sinica》 2012-04
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Geological Characteristics and Genetic Significance of the Ga'erqiong Cu-Au Deposits in Ge'gyai County,Tibet

HU Zheng-hua 1,2),DING Feng 1),TANG Ju-xing 1,3),LI Zhi-jun 1),YAO Xiao-feng 4),DENG Shi-lin 5),ZHANG Zhi 1),WANG Yi-yun 1),WANG Hong-xing 1),SONG Jun-long 1),CHEN Wei 1) 1) Chengdu University of Technology,Chengdu,Sichuan 610059;2) Jiangxi institute of Geological survey,Nanchang,Jiangxi 330000;3) MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;4) China University of Geoscience,Beijing 100083;5) Geophysical Prospecting Party of Sichuan Bureau of Geology and Mineral Resources,Chengdu,Sichuan 610000  
The Ga'erqiong Cu-Au deposit in Ge'gyai County of Ngari area in Tibet is the first large-size Cu-Au deposit based on detailed survey.The ore district has three fractures,in which fractures F1 and F2 are NE-SW trending whereas F3 is NS-extending.The attitude of F 1 is very complex,and the extension is longer than 3000 m.The Cu-Au ore body in this fracture zone is strictly controlled by the fracture.The deposit consists of porphyry Mo-(Cu,Au) ore body,skarn Cu-Au ore body in contact zone and IOCG-like Fe-Cu-Au ore body in F 1 fracture zone.Different ore bodies have marked differences.Porphyry ore body is mainly developed in quartz diorite and granite-porphyry,in which metallic minerals are mainly stockwork molybdenite,and subordinately chalcopyrite,magnetite,pyrite;the mineral assemblages are composed of magnetite-pyrite and chalcopyrite-molybdenite.The skarn ore body is mainly developed in the zone where quartz diorite and granite-porphyry are in contact with carbonatite,and the shapes are lamellar and lamellar;the main metallic minerals are veinlet-stockwork chalcopyrite,bornite,chalcocite,covellite,native copper,native silver and native gold.The IOCG-like Fe-Cu-Au ore body occurs in F 1 fracture zone,its shape is lamellar and the leading metallic minerals are veinlet-stockwork ore and brecciated hematite,magnetite,chalcopyrite,bornite,chalcocite,covellite,native gold;the mineral assemblages are chalcopyrite-native gold,chalcopyrite-bornite-native gold-silver,and hematite-magnetite-native gold.Based on the geological characteristics of the ore deposit in combination with the data available,this paper discusses the geological characteristics of the ore deposit,and holds the view that the Ga'erqiong Cu-Au deposit was formed after the closure of the Bannu Ocean in late Cretaceous period,and by the collision of arc-continent between the southern Qiangtang-Sanjiang complex slab and the Gangdise-Nyanqentanglha slab,showing the tripartite metallogenic characteristics genetically closely related to potassic basalt-high potassic calc-alkaline diorite-lithosome and continent-continent co-collision potassic basalt-high potassic calc-alkaline remelted granite-porphyry.That is to say,the host ore body existed in porphyry,skarn,and structural fracture zone,thus forming the "porphyry-skarn-IOCG-like" Cu-Au deposit.
【Fund】: 公益性行业科研专项(编号:201011013-3);; 国家973项目(编号:2011CB403103)联合资助;; 西藏卓朗基矿业投资有限公司的资助
【CateGory Index】: P618.51;P618.41
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