贵州岩屋坪汞矿床有机流体成矿的包裹体证据

Fluid inclusion evidences for the mineralization of the organic fluid in the Yanwuping mercury deposit,Guizhou

岩屋坪汞矿床是铜(仁)凤(凰)汞矿带内重要的汞矿床之一。对该矿床中的流体包裹体进行了研究,结果表明:矿床内存在多种类型包裹体,包括H2O包裹体、烃-H2O包裹体、烃类包裹体和固体辰砂包裹体。气液H2O包裹体均一温度变化于82.4～176.5℃,流体盐度为13.40%～21.75%NaCl,密度主要集中在1.05～1.10g/cm3,成矿流体属于一种高盐度、高密度的油田卤水。矿石中沥青和辰砂晶体常分布在同一微裂隙中,辰砂晶体中常捕获有沥青包裹体,沥青包裹辰砂颗粒,烃类包裹体和固体辰砂包裹体密切共生,说明有机质与汞矿化的关系极为紧密,为研究有机质在汞的成矿过程中的作用提供了重要依据。

The Yanwuping mercury deposit is an important mercury deposit in Tong-Feng mercury belt. The studies of fluid inclusions show that there are several types of inclusions in this deposit, including H20 inclu sions, hydrocarbon-H2Oinclusions, hydrocarbon inclusions and solid cinnabar inclusions. The homogenization temperatures of the gas liquid H2O inclusions vary between of 82. 4℃ and 176. 5℃, with salinity ranging from 13.40% to 21.75%NaC1 and density varying between 1.05 g/cm3 and 1.10 g/cm3. The ore-forming flu id has the characteristics of oilfield brine with high salinity and high density. Asphalt and cinnabar inclusions are typically found in the same microfissures, and asphalt inclusions are also captured in cinnabar crystals. As- phalt wraps cinnabar particles while hydrocarbon inclusions and solid cinnabar inclusions coexist. Evidence shows that the mercury mineralization was closely related to the organic matter, which provides important in formation for the study of the role of organic matter in the mercury mineralization process.