Regional fractures and denudation of gold ore deposits in Gangdise block,Tibet:Evidence of Ag/Au values  

作　　者：李胜荣 邓军 侯增谦 肖润 袁万明 冯效良 赵志丹 申俊峰 周肃 

出　　处：《Science China Earth Sciences》2001年第S1期121-127,共7页中国科学（地球科学英文版）

基　　金：the National Key Project for Basic Research (G1998040800), the National Natural Science Foundation of China (Grant Nos. 49873013, 40073012) and China Geological Survey (20001020223023).

摘　　要：Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.

关 键 词：: Ag/Au ratio REGIONAL fracture DENUDATION gold ore deposit Tibet. 

分 类 号：P618.51[天文地球—矿床学]