西藏吉如斑岩铜矿地质特征及流体包裹体均一温度对成矿过程的指示意义

Geological Characteristics of Jiru Porphyry Copper Deposit in Tibet and Its Indicative Significance of Fluid Inclusion Homogenization Temperature to Mineralization Process

吉如斑岩型铜矿位于冈底斯斑岩成矿带中段,发育有中新世和始新世两期斑岩矿化。通过研究这两期矿化形成的石英—硫化物脉中的包裹体特征,并测定了其均一温度,发现二者存在较大差异,并推测流体温度的降低可能是矿质沉淀的主要因素。

The Jiru porphyry copper deposit is located in the middle part of Gangdise porphyry metallogenic belt,with two stages of porphyry mineralization in Miocene and Eocene.By studying the characteristics of inclusions in quarz-sulfide veins formed by mineralization in these two stages and measuring their homogenization temperature,it is found that there is a great difference between the two types veins.It is speculated that the decrease of fluid temperature may be the main factor of mineral precipitation.