耿庄金矿床产于燕山期隐爆角砾岩体内,是晋东北具有代表意义的金多金属矿床之一。对矿床流体包裹体系统研究表明,不同成矿阶段石英中流体包裹体主要有5种类型:富气相包裹体、富液相包裹体、含CO2三相包裹体、含子矿物三相包裹体及少量纯液相包裹体,流体属H2O-CO2-NaCl体系类型。成矿前阶段包裹体类型多样,且以相似的均一温度共存,显示流体具明显沸腾及不混溶特性;成矿温度集中于170~180℃。结合同位素和金矿物特征,认为耿庄金矿床应为与燕山期次火山热液有关的中低温热液型金矿床。
The Gengzhuang gold deposit, one of the typical gold polymetallic deposits in northeastern Shanxi Province, occurs in Yanshanian crypto-explosive breccia body. The studies of fluid inclusions indicate that there are five types of inclusions in the quartz of different metellogenic stages, i.e. gas-rich aqueous, HeO-rich aqueous, three-phase CO2-bearing, three-phase daughter-mineral bearing and single-phase aqueous fluid inclusions, and the mineralized fluids are of H20 - COe - NaC1 type. The various types of inclusions formed in ex-metallogenic stage have similar homogeneous temperatures, which indicates that the fluid experienced boiling or aqueous fluid immiscibility. The major metallogenic temperaute is about 170 - 180℃. Combined with isotopic composition and characteristics of gold minerals, we can conclude that the Gengzhuang gold deposit belongs to medium- low hydrothermal gold deposit related to the Yanshanian sub-volcanic activities.