【摘要】 为探讨成矿流体的特征和演化过程,对德兴铜厂斑岩铜矿床不同蚀变-矿化带石英细脉中的流体包裹体进行详细的岩相学观察、显微测温、显微激光喇曼探针工作。结果显示,德兴铜厂斑岩铜矿主要有三类流体包裹体:富液相包裹体(Ⅰ型),富气相包裹体(Ⅱ型)、多相包裹体(Ⅲ型);成矿早期的Ⅰ型包裹体,主成矿期的Ⅱ型和III型包裹体,以及成矿晚期的I型包裹体的平均均一温度和平均盐度分别为:481℃,8.1%;410℃,1.2%;389℃,56%和215℃,3.1%;主成矿期的II型和III型包裹体的平均均一温度相近,但盐度相差很大,指示了沸腾作用的发生;从早期到晚期,成矿流体呈现温度降低,挥发分逸出的趋势。更多还原

【Abstract】 This paper discusses the characteristics and the evolution of the ore-forming fluids in the Tongchang porphyry copper deposit of Dexing on the basis of the analyses of petrography,microthermometry and raman on fluid inclusions in the quartz veins of different alteration-mineralizaiton belts.The results show that: There are three types fluid inclusions: Liquid(H2O)-rich fluid inclusions(I),gas-rich fluid inclusions(II),multiphasic fluid inclusions(III).The homogenization temperature and salinity of the I type fluid inclusion in the early stage is 481℃ and 8.1%,respectively;the homogenization temperatures and salinities of II,III types fluid inclusions in the ore-forming stage are 410℃,389℃ and 1.2%,56%,respectively;the homogenization temperature and salinity of the I type fluid inclusion in the late stage is 215℃and 3.1%,respectively.Fluid inclusions of II and III types have similar homogenization temperature and very different salinity,which implies that the ore-forming fluids have been boiled in this stage.When boiling,CO2 and water are immiscible,most CO2 get into the II type inclusions.Boiling and immiscibility of fluid are very important for the mineralization;from the early stage to the late stage,the temperature and the content of CO2 of the ore-forming fluids decreased.更多还原