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《Geotectonica Et Metallogenia》 2008-04
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DETERMINATION OF MINERALIZING AGES ON GOLD ORE DEPOSITS IN THE EASTERN HUNAN PROVINCE,SOUTH CHINA AND ISOTOPIC TRACKING ON ORE-FORMING FLUIDS——RE-DISCUSSING GOLD ORE DEPOSIT TYPE

DONG Guojun1,2,XU Deru2,WANG Li2,3,CHEN Guanghao2,HE Zhuanli1,3,FU Gonggu1,3,WU Jun2,3and WANG Zhiling2,3(1.402 Geological Team of Hunan Bureau of Geology and Mineral Resources,Changsha 410004,Hunan,China;2.Researh Center of Petroleum,Natural Gas and Mineral Resoures,Guangzhou Institute of Geochemistry,Chinese Academy of Science,Guangzhou 510640,Guangdong,China;3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
Based on Rb-Sr isotopic dating on fluid inclusion in quartz from auriferious quartz veins in the eastern Hunan Province of Jiangnan orogenic belt,south China and on analysis of sulfur isotopic component,the Huangjingdong gold ore deposit yielded a Rb-Sr isochrone age of 152±13Ma whereas an age of 70±1.3Ma for the Dadong ore deposits.The average δ34S values for sulfides in quartz ore veins are-6.3‰(mainly between-4.8‰ and-8.6‰)for the Huangjingdong gold deposit,-9.2‰(mainly between-8‰ and-10‰)for the Dadong gold deposit and-1.2‰(mainly between-2.6‰ and 6.1‰)for the Yanlinsi gold deposit,respectively.In the light of the regionally tectonic evolution of South China and the previous studies on gold ore deposits in the Jiangnan orogenic belt,we conclude that our studied region mainly contained three epochs of gold mineralization,which are 440~400Ma,160~110Ma,and ~70Ma,respectively.The ore-forming fluids had a primary derivation from deep section and were related to metamorphic water or magmatic water,but recycled meteor water or sea water were largely involved during late stages of mineralization.The gold ore deposits in Hunan region of the Jiangnan orogenic belt show some features of orogeny-related epizonal gold ore deposits.
【Fund】: 国家自然科学基金项目(No.40773017)资助
【CateGory Index】: P618.51
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