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《Journal of Jilin University(Earth Science Edition)》 2010-05
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Exhalative Sedimentary Genesis of Lawu Copper-Lead-Zinc Deposit in Dangxiong County of Tibet

LIAN Yong-lao1,2,CAO Xin-zhi1,YAN Chang-hai3,DU Xin31.Faculty of Resources,China University of Geosciences,Wuhan 430074,China2.No.1 Gold Geological Party of CAPF,Mudanjiang,Heilongjiang 157021,China3.Henan Institute of Geological Survey,Zhengzhou 450007,China  
The Lawu copper-lead-zinc deposit in Dangxiong,Tibet,is hosted in the Upper Carboniferous-Lower Permian Laigu Group in the southern part of the Namucuo-Jiali fault belt.The ore bodies are controlled by the Riyinna anticline and faults of different directions.The mineralization in the deposit can be divided into two types,the early layered and laminated and the later veined ores.The derivation of the ore-forming materials and the genesis of the deposit are discussed by studying on the geological characteristics of the deposit,the stable isotope and REE of the ores and their host rocks.It shows that the REE of the host rocks is characterized by weak negative anomalies of Ce/Ce(0.89-0.95)and moderately depleted Eu/Eu(0.56-0.64).δ34S value of the sulfide is from-2.92‰ to-0.42‰,averaging-1.68‰,indicating that sulfur might come from a deep-source.Hydrogen and oxygen isotope compositions of the fluid inclusions in quartz in the ores indicate that the ore-forming fluid of the deposit was dominantly formed by the mixing of the deeply circulated seawater and the magmatic water at the early period of mineralization.However,the late stage of mineralization was featured by long time of involvement and dominance of meteoric waters.The study shows that the Lawu copper-lead-zinc deposit belongs to a sedimentary exhalative Cu-Pb-Zn deposit superimposed by the Yanshanian magmaic hydrothermal activity.
【Fund】: 中国地质调查局项目(1212010530103)
【CateGory Index】: P611
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