西藏谢通门县罗布真铜多金属矿地质特征及成因分析

Genesis Analysis and Geological Characteristics of Luobuzhen Copper Polymetallic Deposit in Xietongmen County,Tibet

西藏冈底斯带主要成矿类型以斑岩型铜钼矿为主,对浅成低温热液或岩浆热液型矿床的成因研究相对较小。近年来,在冈底斯中段所发现的雄村大型铜金矿,多数学者认为属于岩浆热液成因类型。罗布真铜多金属矿位于冈底斯中段,距离雄村矿区较近,通过分析矿区地质特征、矿体矿石等特征,并与雄村铜金矿进行成因对比,认为该矿属于岩浆热液蚀变型成因。通过对罗布真矿床成因的分析,探讨了冈底斯中段的成矿规律,为地质找矿提供了思路。

The metallogenic type of Gangdise belt in Tibet is porphyry copper-molybdenum deposit primarily, the genesis of epithermal deposit or magmatic hydrothermal deposit has not been paid enough attentions. In recent years, the large scale Xiongcun copper-gold deposit, discovered in the middle of the Gangdise Mountains, is regarded as magmatic hydrothermal type. Luobuzhen copper-polymetallic deposit is also located at middle of the Gangdise Mountains, which is near to Xiongcun ore district. In this paper, on the basis of analysis on geological characteristics, ore body and ore features of Luobuzhen ore district, comparing its genesis with Xiongcun copper-gold deposit, it is concluded that the genesis of Luobuzhen deposit belongs to magmatic hydrothermal altered type. Taking it as a case study, the authors further deduce the metallogeny in the middle Gangdise, which provides the new idea of prospecting in the Gangdise metallogenic belt.