辽宁丹东四道沟金矿床叠生成因的流体包裹体证据

四道沟金矿床为辽东南地区一重要蚀变岩型矿床,其空间产出受构造、盖县组变质地层及区内岩浆活动的联合制约。矿化分3种类型、4个成矿阶段。流体包裹体研究表明,成矿早期流体为一中温、低盐度且富含CO2及CH4等挥发份的热液;矿区主成矿阶段成矿流体为一中温高盐度类型热液。综合分析认为,四道沟金矿床是燕山晚期不同来源及性质的热液先后叠加成矿作用的产物,矿床属叠生成因类型。

Fluid inclusion evidence for the superimposition origin of Sidaogou gold deposit in Dandong,Liaoning Province

The Sidaogou gold deposit is an important altered-rock type deposit that lies in the southeastern Liaoning Province.Its spatial occurrence were jointly controlled by structure metamorphic strata of the Gaixian Formation and magmatic activities in this region.The mineralization can be classified into three types and four metallogentic stages.Studies on fluid inclusions show that the fluids that were responsible for the formation of gold-poor quartz veins of metallogenic stage in the mining district are medium temperature low salinity and rich CO2 and CH4 hydrothermal solution.The fluids that were responsible for the major metallogenic stage are characterized by medium temperature and high salinity.Based on comprehensive analysis,the conclusion were made that Sidaogou gold deposit was the result of the superimposed mineralization of two kinds of different sourced fluids with different characteristics,it is of superimposition origin ore deposit.