Abstract:The Damogou-Naoyangping fluorite deposit of Shaanxi occurs in the secondary fractures of the regional east-westtrending fault F1. The metallogenesis can be divided into four stages, i.e. Ⅰ) giant calcite crystal stage; Ⅱ) coarse-grained fluorite-calcite fluorite-quartz fluorite stage; Ⅲ) quartz sulfide (sphalerite) stage; and Ⅳ) calcite veinlet-fluorite veinlet stage. The result of petrographic observations indicates that, the inclusions are mainly of gas-liquid two-phase, pure gas phase, pure liquid phase, CO2-H2O three-phase and daughter mineral-bearing type. Microthermometry reveals that the homogenization temperatures of fluid inclusions in fluorite of Damogou deposit range from 290 to 340℃, with salinities from 0.5% to 6.16%(NaCl eqv.). The gas-liquid two-phase fluid inclusions in fluorite yield trapping pressures of 22.072-25.089 MPa, corresponding to a depth of 776.3-1268 m. The homogeneous temperatures of fluid inclusions of Naoyangping deposit are between 289 and 329℃, with a high salinities. The variation of salinity can be used to infer the migration direction of fluid. In the process of fluid migration, the abrupt reduce of pressure in the brittle structural fissures may result in hydrothermal boiling.
韩鹏飞, 杨兴科, 张文高, 樊培贺. 陕西平利大磨沟-闹阳坪萤石矿床流体包裹体特征[J]. 地质与资源, 2014, 23(3): 284-287.
HAN Peng-fei, YANG Xing-ke, ZHANG Wen-gao, FAN Pei-he. CHARACTERISTICS OF FLUID INCLUSIONS OF THE DAMOGOU-NAOYANGPING FLUORITE DEPOSIT IN SHAANXI PROVINCE. GEOLOGY AND RESOURCES, 2014, 23(3): 284-287.