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《Acta Geologica Sinica》 2006-07
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Alteration Zoning and Organic Fluid Inclusions in Basalt Copper Deposits in Northeastern Yunnan and Western Guizhou and Their Geological Significance

LI Houmin~ 1,2) , MAO Jingwen~ 1,3) , ZHANG Guan~ 4) , XU Zhangbao~ 5) , GAO Hongguang~ 5) , ZHANG Changqing~ 1) , WANG Denghong~ 1) , XU Hong~ 3) 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 1000372) Changan University, Xian, Shaanxi, 7100543) School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing, 1000834) Geological Survey of Henan Province, Zhengzhou, 4500575) Yunnan Institute of Geosciences, Kunming, 650011  
Besides bitumen, a lot of organic fluid inclusions composed of liquid hydrocarbon, solid bitumen and gas are discovered in quartz from basalt copper ores in northeastern Yunnan and western Guizhou, suggesting that the bitumen directly came from crude oil. According to the logs of dill holes, the mineralization and alteration are zoned vertically: native copper in upper part and chalcocite in lower part. The location of bitumen is consistent with that of native copper very well, showing their close genetic association. However, the location of some native copper is higher than bitumen. All the above suggest that there had been petroleum—gas reservoir in the lower part of the Fourth Member of the Emeishan Basalt Formation of Upper Permian in the adjacent area of northeastern Yunnan and western Guizhou. The petroleum—gas reservoir not only provided structural trap for copper mineralization, but also resulted in the zoning of mineralization and alteration. Native copper resulted from strong reduced condition.
【Fund】: 国家自然科学基金资助项目(编号40572060);; 中国地质调查局地质调查课题(编号1212010561604)的成果
【CateGory Index】: P618.41
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