东天山铜沟铜多金属矿床地质特征与成因研究

Geological characteristic and genesis of the Cu polymetallic deposit in the Dabancheng area, Eastern Tianshan

东天山博格达造山带内发育有一系列铜多金属矿床,形成了达坂城铜多金属矿集区。本次研究对达坂城地区铜沟铜多金属矿床开展成矿特征研究。研究区内铜多金属矿床矿体主要以似层状、透镜状及脉状产于下石炭统地层中。矿体围岩蚀变以青磐岩化为主,矿物组合(磁铁矿-黄铜矿-绿帘石-绿泥石-石英脉)特征与斑岩型矿化边缘的脉型多金属矿化矿物组合特征相似。因此,铜沟铜多金属矿化为与斑岩有关的脉型多金属矿化,深部具有斑岩型铜多金属矿化的潜力。

The Bogda metallogenic belt of East Tianshan hosts a number of Cu polymetallic deposits,and formed the Dabancheng mineralized district.This study provides the geological characteristic of mineralization from the Tonggou Cu polymetallic deposit in Dabancheng area.The stratiform-like,lenticular,and vein–shaped Cu polymetallic orebodies occur in the Lower Carboniferous strata in study area.The hydrothermal alteration of surrounding rocks mainly is propylitization,mineral assemblages(magnetite±chalcopyrite±epidote±quartz)is similar to propylitic assemblages of porphyry mineraliztion.Therefore,Cu polymetallic mineralization in Tonggou is belong to porphyry-related polymetallic vein mineralization,and porphyry Cu polymetallic mineralization is potential in deep.