Cenozoic Ore Concentration Areas in the Sanjiang Region, SW China: Tectonic Setting and Exploration
WANG Denghong 1) YANG Jianmin 1) YAN Shenghao 1) XU Jue 1) CHEN Yuchuan 2) XUE Chunji 3) LUO Yaonan 4) YIN Hanlong 5) ( 1)Institute of Mineral Resources, CAGS,Beijing,100037;2)Chinese Academy of Geological Sciences,Beijing,
The Sanjiang (Nujiang River, Lanchangjiang River and Jinshajiang River ) region in SW China is the most important Cenozoic metallogenetic belt in China, where ore concentration areas are widely distributed. For example, the largest Cu deposit in China is located in the Yulong ore concentration area, the largest Pb-Zn deposit in China occurs in Jinding area, the second largest REE deposit in China is situated in Maoniuping area, the largest blue asbestos deposit in China lies in the Dali-Yao'an area, and the largest coal deposit in South China rests in the Zaotong area. Generally, all of these areas show a distribution pattern of "two horizontal, two vertical, two diagonal and one spot" model. Such a distribution model is consistent with the regional tectonic setting. During Cenozoic, the Chinese earth crust changed greatly, characterized topographically by thickening in the southwest and thinning in the east or uplifting in the west and depressing in the east. Located in the central part of South China, the Sanjiang region was subjected to strong horizontal squeeze from different directions and was attacked by mantle materials and affected by heat and fluids from mantle source, resulting in the formation of complex tectonic setting and a lot of ore concentration areas. Among the nine mature ore concentration areas, three developing areas and three potential areas are delineated. Besides, this paper has put forward some views for further prospecting work in the Sanjiang region, for example, Pre-Cenozoic deposits, especially massive sulfide deposits, could be exposed to surface by large scale slip, shear or thrust structures, and geological fluids could precipitate mantle-source metals in Cenozoic basins along marginal deep faults.
【Fund】： 国家重点基础研究项目“大规模成矿作用及大型矿集区预测”(G19990 432 0 3)的成果之一;; 地质大调查项目 (K1.4 3 4);; 国家计委专项;; 国土资源部 1999年一般项目 ( 992 0 2 4)资助
【CateGory Index】： P611
【CateGory Index】： P611