西藏冈底斯驱龙斑岩型铜钼-矽卡岩型铜矿成矿体系:辉钼矿Re-Os同位素年代学证据

Qulong Porphyry-Skarn Metallogenic System in Gangdese Belt,Tibet:Evidence from Molybdenite Re-Os Geochronology

在西藏冈底斯驱龙斑岩型铜钼矿床南部2 km和东南4 km处分别发育知不拉和浪母家果矽卡岩型铜矿床,它们与驱龙斑岩矿床空间上相邻。其中,浪母家果矽卡岩型矿床中辉钼矿Re-Os等时线年龄为(17.11±0.55)Ma,表明其形成时间与驱龙和知不拉相近。综合冈底斯成矿带区域成矿作用和典型矿床的最新研究成果认为,驱龙斑岩型铜钼矿床-知不拉矽卡岩型铜矿-浪母家果矽卡岩型铜矿系同一期岩浆热液成矿作用的产物,构成一个完整的斑岩-矽卡岩型成矿体系。因此,区域找矿时,应注意在斑岩型铜矿外围寻找高品位矽卡岩型矿床;同时,在具有矽卡岩型矿化的勘查区内应注意寻找深部可能存在的斑岩型铜钼矿床。

are two typic southeast to t Nearby the Qulong gaint porphyry Cu - Mo deposit at the Gangdese belt in Tibet, there al skarn Cu deposits. The Zhibula deposit is 2 km south and Langmujiaguo is 4 km he Qulong deposit. It＇s reported that the Re - Os isotopic age of the molybdenite dating from Langmujiaguo skarn deposit is （17.11±0.55） Ma. Combined with the published dating data from Qulong and Zhibula, a conclusion can be drawn that those deposits in the Qulong area were derived from the common magmatic hydrothermal mineralization and they may belong to a complete porphyry-skan ore-forming system. More attention should be paid to the porphyry deposits and the adjacently skarn deposits during geological prospecting and exploration at Gangdese belt.