辽宁娘娘宫金银矿床地质特征及成因

Geological characteristics and genesis of Niangnianggong gold-silver deposit in Liaoning Province,China

对娘娘宫金银矿床成矿地质特征和矿床成因进行了研究,研究结果表明:该矿床受EW向断裂带石英脉控制,矿床类型为石英脉型;矿床矿石δ34S总平均值为2.91‰,变化范围为1.6‰～4.9‰,显示了热液硫同位素特点;铅同位素结果集中在原生铅区内,显示了古老的铅体系特征,说明金源可能来源于新太古代富金建平群大营子组;氢氧同位素投点结果靠近雨水线,表明成矿热液有大气降水的参与;含金石英脉包体的Rb-Sr年龄为186.6 Ma,与闪长岩脉的成岩年龄具有一致性,显示两者成因上的联系。综合分析表明,该矿床为混合热液成因的石英脉型金银矿床。

Based on the analysis of geological characteristics and genesis of Niangnianggong deposit, this paper suggested that the deposit is controlled by the EW direction faults and belongs to quartz vein type. Average value of δ^344S of the ore is 2.91‰, and the variation ranges from 1.6‰ to 4.9‰, which shows the feature of hydrothermal sulfur. The result of lead isotope is fall into original lead zone, which shows the feature of primeval lead system. The result of H-O isotope is close to meteoric line, which means the participation of precipitations. Rb-Sr age of ore is 156.6 Ma, which is similar to the age of diorite dike. Multi-disciplinary analysis concludes that the deposit is a quartz vein type deposit with composite hydrothermal origin.