青海三色沟铅锌矿流体包裹体特征及矿床成因  

Characteristics of fluid inclusions and ore genesis of Sansegou Pb-Zn deposit in Qinghai Province,China

作　　者：宋泽友[1,2] 赖健清[1,2] 王雄军[1,2] 张建东[1,2] 宋文彬[1,2] 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083

出　　处：《中国有色金属学报》2012年第3期715-725,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家"十一五"科技支撑计划重大项目(2006BAA01B06)

摘　　要：三色沟矿区位于我国著名成矿带之一的东昆仑造山带中部,矿区出现的主要矿化类型包括脉型铅锌矿化和斑岩型铜矿化。流体包裹体研究表明,三色沟矿区流体包裹体类型包括气液两相水溶液包裹体(Ⅰ型)、水溶液-CO2包裹体(Ⅱ型)和纯CO2包裹体(Ⅲ型)。成矿流体具有低盐度、低密度的特点,铅锌成矿温度下限值为178～209℃,盐度为0.3%～18.8%(NaCleq),估算成矿压力为50～143 MPa;铜矿化成矿温度下限值为182～228℃,盐度为3.5%～18.8%(NaCleq),估算成矿压力为71～164 MPa。成矿过程中流体发生相分离,对多金属硫化物的沉淀起到重要作用。结合矿区的地质演化史,认为矿区中部与岩浆热液作用有关的斑岩型铜矿化,与区内强烈发育的铅锌矿化均为同一构造-岩浆作用的产物。Abstract： The Sansegou PboZn deposit is located in the eastern Kunlun orogenic belt, one of the famous metallogenic belt in China. The main mineralized types in the deposit are vein-type Pb-Zn mineralization and porphyry-style copper mineralization. Fluid inclusion studies indicate that the fluid inclusions are in three types： two-phase aqueous inclusion （type I ）, three-phase CO2-aqueous fluid inclusion （type Ⅱ） and pure CO2 fluid inclusion （type Ⅲ）. The ore-forming hydrothermal fluids are characterized by low salinity, low density, and the Pb-Zn mineralizing temperatures range from 178 to 209 ℃, low salinities range from 0.3% to 18.8% NaCI equivalent, and the calculated pressure ranges from 50 to 143 MPa; the porphyry copper mineralizing temperatures range from 182 to 228 ℃, salinities range from 3.5% to 18.8% NaCl equivalent, and the calculated pressure ranges from 71 to 164 MPa. The immiscibility of ore-forming fluids plays an important rote in the metaltogentic process of Pb-Zn-Cu deposit. Associated with the tectonic environment, it is suggested that the porphyry-style copper mineralization in the central part of the ore district which is related to magmatic hydrothermal activities is the result of the same tectionic-magmatic activities as Pb-Zn mineralization.

关 键 词：流体包裹体:成矿流体 东昆仑 三色沟 矿床成因 

分 类 号：P618.42[天文地球—矿床学]