云南红河绿春大马尖山铜砷矿床成矿液体特征

Characteristics of ore-forming liquid of Damajianshan Co-As deposit in Lvchun,Honghe of Yunnan

矿体受石英斑岩和断层控制,一般产于石英斑岩与志留系地层接触带附近或断层破碎带中,与燕山晚期构造运动有关。绿春大马尖山铜砷矿床成矿流体从下部到上部的成矿温度逐渐降低,成矿盐度由低到高,均一温度变化不大,暗示流体从下部到上部,由富Na体系向富Ca体系逐级演化;该区铜砷矿床流体特征与钨成矿流体特征不同,暗示二期成矿特征,初步判断该矿床为构造控制的热液脉型矿床。

The orebodies are controlled by quartz porphyry and faults. It generally occurred near the contact zone of quartz porphyry and silurian formation or in the fault fracture zones, which are related to the late Yanshan tectonic movement. As to the ore-forming fluids of Damajianshan Cu-As deposit of Lvchun district, the mineralization temperature decreases and meanwhile the mineralization salinity increases from the lower to the upper part and the homogenization temperature changes a little, that implies there is a progressive e- volution for the fluid from lower to upper and Na-rich system to Ca-rich system. In this area, the Cu-As and W ore-forming fluids flow characteristics are different, there was 2 phases of metallogenic characteristics, so it＇s considered to be a structurally controlled hydrothermal vein type deposit.