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青龙沟金矿床地质特征研究表明,矿化发生在NW向断裂组及NS向次背斜中,矿石类型为变砂岩、硅化白云石大理岩、蚀变闪长玢岩及绢云千枚岩型,围岩蚀变硅化分2期,表现出该金矿床多期次成矿的过程。流体包裹体研究表明,M2矿体硅化大理岩石英中发育气液二相包裹体,成矿流体属H2O-NaCl体系类型。成矿流体具有低盐度(2.73%~7.99%NaCl)、低密度(0.86~0.95 g/cm3)的特征,成矿温度为123.6~204.5℃,成矿压力为8.99~18.53 MPa,形成深度为0.9~1.91 km,显示出该矿床浅成环境成矿作用下一类成矿流体的性质。
The study on the geological characteristics of the Qinglonggou gold deposit shows that the mineralization took place in the NW-trending fault group and the NS-trending sub-anticline. The types of ore are variable sandstone, silicified dolomite marble, altered diorite and sericite phyllite , Alteration silicification of the wall rocks is divided into two stages, showing the gold deposit multi-stage mineralization process. Fluid inclusions studies show that M2-bearing silicified marble quartz is a gas-liquid two-phase inclusions and the ore-forming fluid belongs to the H2O-NaCl system type. The ore-forming fluid is characterized by low salinity (2.73% -7.99% NaCl) and low density (0.86-0.95 g / cm3). The ore forming temperature is 123.6-204.5 ℃ and the metallogenetic pressure is 8.99-18.53 MPa. The depth of formation is 0.9 ~ 1.91 km, indicating the nature of a type of ore-forming fluid under the shallow environmental mineralization of this deposit.