GEOLOGICAL CHARACTERISTICS OF DASHUIGOU TELLURIUM ORE DEPOSIT IN SHIMIAN COUNTY,SICHUAN PROVINCE, CHINA
Chen Yuchuan1, Yin Jianzhao1, Zhou Jianxiong1, Mao Jingwen1, Yang Baichuan2, Luo Yaonan3
1. Chinese Academy of Geological Sciences, Beijing 100037; 2. Nonferrout Rare and Precious Metal Company of Sichuan Province, Chengdu 610072; 3. Bureau of Geology and Minerol Resources of Sichuon Province, Chengdu 610081
Dashuigou tellurium ore deposit is located in the connecting part between the geosycline and the Yangtze platform. It is limited in the leguminous tectonic microlithon, which is enclosed by the Luding-Mianning regional ductile shear zone. The microlithon is a xnetamorphic dome which is composed of middle-lower Triassic sirata. The core of the dome is a set of coarse-crystallized marble. The limbs are constituted by cafe-quartz shist, sericite-tremolite with marble interbed. It is 15000m thick.Twelve pyrrhotite veins have been found and four of them been mined. The strike of the ore veins are SN and NNE(0°-10°), the dip angle 60°～70°. Tellurium ore veins are closely associated with pyrrhotite ones and controlled by the lat ter. The former penetrates into the latter. The ore veins obviously bevel the strata around them. The single tellurium ore vein is 0.3-0.5m thick. All of them take the shape of lenticule and have the characteristics of thinning out and reproducibility in both strike and dip direction. The main ore vein is 150m long and extends 50m in the deep.Wall-rock,alterations are extensively developed in the mine. The main alterations are muscovitization, ankeritation, silication, sericitization, tourmalinization, chloritization and so on.Mineral assemblage of the ores are as follows: pyrite, pyrrhotite, tetradymite,chalcopyrite, sphalerite, joseite, tellurobismuthite, trigona, hessite, tellurium, etc. Its gangue minerals are dolomite, ankerite, calcite, quartz and muscovite, etc.As the first and the only independent tellurium ore deposit in the world at present, Dashuigou tellurium ore deposit is probably giant according to Laznicka P.(1989).
Chen Yuchuan,Yin Jianzhao,Zhou Jianxiong et al. GEOLOGICAL CHARACTERISTICS OF DASHUIGOU TELLURIUM ORE DEPOSIT IN SHIMIAN COUNTY,SICHUAN PROVINCE, CHINA[J]. Chinese Journal of Geology, 1994, (2): 165-167.