Fluid Inclusions of the Changgou Gold Deposit in North Hanyin, South Qinling
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摘要: 长沟金矿位于南秦岭造山带汉阴北部地区，其矿体产出主要受韧性剪切带的控制。通过对矿区主要发育的2期石英脉流体包裹体特征研究表明：石英脉中主要发育气液两相包裹体，单相和三相流体包裹体少见；均一温度范围为175~385℃，含金石英脉流体包裹体均一温度为190~210℃；盐度变化较大，范围为0.88%~19.05% NaCleq；成矿流体属于中-低温、中-低盐度流体。S2期石英脉流体捕获压力范围为45.59~85.00 Mpa，流体捕获深度在1.69~3.15 km，应为中浅深度成矿。S2期石英脉应为与金矿成矿关系较为密切的主成矿期流体，S3期石英脉为较高温度、低盐度，与成矿关系不大。Abstract: The Changgou gold deposit is located in northern Hanyin, South Qinling orogenic belt, and the ore body is mainly controlled by ductile shear zone. The fluid inclusions of two stages quartz veins in the Changgou gold deposit have been studied. The results indicated that these inclusions are mainly gas-liquid inclusions in quartz veins, with few single phase and three-phase fluid inclusions. Their homogeneous temperature range from 175℃ to 385℃, and the ones of fluid inclusions in gold-bearing quartz veins are 190~210℃. Their salinities vary from 0.88% NaCleq to 19.05% NaCleq. These metallogenic fluids have the features of medium-low temperature and medium-low salinity. The fluid trapping pressures of quartz veins in S2 stage are 45.59~85.00Mpa, with trapping depth of 1.69~3.15km, belonging to middle-shallow depth mineralization. The quartz veins in S2 are closely related to gold mineralization, but the quartz veins in S3 stage show high temperature and medium-low salinity, have little relationship with mineralization.
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Keywords:
- Changgou gold deposit /
- quartz vein /
- fluid inclusion /
- South Qinling
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