【摘要】 紫木凼金矿床是黔西南典型的大型微细浸染型金矿床之一。对该矿床包裹体进行了研究,结果表明,包裹体类型有H₂O包裹体、CO₂包裹体、CO₂-H₂O包裹体和固体包裹体四种,其中H₂O包裹体温度变化为84.9²43℃,主要集中在110²30℃;盐度0.18%⁷.59%（NaCl）,平均4.05%（NaCl）;密度0.8¹.0 g/cm³;CO₂-H₂O包裹体完全均一温度变化范围为209.4²54.4℃,平均241.42℃,盐度为0.82%².81%（NaCl）,平均1.704%（NaCl）,密度介于0.917⁰.967 g/cm3之间,平均为0.944 g/cm³,压力变化范围108.622¹50.946 MPa,平均133.639 MPa,高于上覆岩层静岩压力,说明成矿流体属于中低温、低盐度、中等密度、具有超压性质的流体。H₂O包裹体、CO₂包裹体和CO₂-H₂O包裹体共生于同一视域内,且CO₂-H₂O包裹体以不同比例的CO₂相出现,加热时富H₂O相包裹体均一到水相,富CO₂相包裹体均一到气相,两种均一温度基本一致;反映成矿过程中发生过流体不混溶,致使Au沉淀并成矿。更多还原

【Abstract】 Zimudang gold deposit is a typical example of Carlin-type gold deposit in Southwest. The study of the temperature and pressure,salinity and density of the fluid inclusions in quartz and calcite closely associated with the Au deposit,showed that fluid inclusions types have H₂ O inclusions,CO₂ inclusions,CO₂-H₂ O inclusions and solid inclusions. Homogenization temperature of H₂ O inclusions range from 84. 9 ℃ to 243 ℃,mainly concentrate in 110 to 230 ℃; The salinities vary between 0. 18% and 7. 59%（ Na Cl）,an average of 4. 05%（ Na Cl）; and density range from 0. 8 g / cm3 to 1. 0 g / cm³; The homogenization temperature of CO₂-H₂ O inclusions range between209. 4 ℃ and 254. 4 ℃,the average 241. 42 ℃,salinity is 0. 82% to 2. 81%（ Na Cl）,an average of 1. 704%（ Na Cl）,and density vary between 0. 917 g /cm³ and 0. 967 g / cm³,an average of 0. 944 g /cm³,pressure range108. 622 MPa to 150. 946 MPa,an average of 133. 639 MPa,higher than surrounding rock pressure. Through the microscopic,H₂ O inclusions,CO₂ inclusions and CO₂-H₂ O inclusions were born in the same horizon inside,and CO₂-H₂ O inclusions with different proportion of CO₂ phase appear. When heated,the homogeneous phase state of H₂O-rich CO₂-H₂ O inclusions was the H₂ O phase,while that of CO₂-rich CO₂-H₂ O inclusions was the CO₂ phase.Moreover,they have the same homogeneous temperature. It showed that mineralized fluid is characterized by low temperature and salinity,mid-temperature and overpressure gold-bearing fluid,preliminary judged that CO₂-H₂ O fluid immiscibility occurred.更多还原