吉林夹皮沟地区金矿床流体包裹体特征差异及其地质意义

The difference in fluid inclusion characteristics among gold deposits in Jiapigou district and its geological siganificances

通过对夹皮沟地区下戏台、小北沟金矿床流体包裹体研究 ,发现两矿床矿石石英中发育的流体包裹体特征存在明显差异。在下戏台金矿床矿石石英中发育CO2 包裹体 ,含CO2 三相、气液两相及单液相包裹体等 4种类型的原生包裹体 ,各类包裹体均一温度为 2 18.2℃～ 4 2 9.8℃ ,盐度为4 .2 %～ 10 .8% ,成矿流体为不混溶NaCl-H2 O -CO2 热液体系类型 ;而小北沟金矿床石英中主要发育气液两相及单液相包裹体 ,包裹体均一温度为 14 3.5℃～ 2 72 .2℃ ,盐度为 3.3%～ 9.6 % ,成矿流体属NaCl-H2 O热液类型。由包裹体所反映的两矿床成矿流体特征差异 ,表明其来源不同 。

Fluid inclusion studies on Xiaxitai and Xiao beigou deposit in Jia pigou gold metallogenic zone showed that clear differences in fluid inclusion features exsit between the two gold deposits.At Xia xitai gold deposit,there are carbon dioxide,carbon dioxide bearing three phase,aqueous two phase as well as single liquid phase etc.four types of primary fluid inclusions developed in ore quartz,their homogenization temperature is 218.2℃～429.8℃,salinity is 4.2% NaCl,the ore forming fluids is of immiscible NaCl-H 2O-CO 2 system.While at Xiao beigou gold deposit,only aqueous two phase and single liquid phase etc.two kinds of primary fluid inclusions developed in ore quartz,their homogenization temperature is 143.5℃～272.2℃,salinity is 3.3%～9.6% NaCl,the ore forming fluids is of NaCl-H 2O system.The difference in ore forming solutions reflected by fluid inclusions testified the viewpoint put forward by former investigators that there are two kinds of gold deposits of different origin exsit in this region progressively.