黑龙江省鸡东县四山林场银金矿成矿流体特征研究

The Ore-forming Fluid Characteristics of Sishanlinchang Silver-gold Deposit in Jidong County Heilongjiang Province China

四山林场银金矿是太平岭成矿带上典型的含金石英脉型矿床。为研究成矿流体的性质及元素沉淀机制,笔者运用显微测温、激光拉曼探针技术,对其矿物石英内的流体包裹体进行系统研究。实验结果表明:1)流体包裹体类型简单,为气液两相包裹体;2)显微测温获得均一温度为152~320℃,成矿流体盐度为4.18~13.62wt%(NaCl),密度为0.73~0.91g/cm-3;3)激光拉曼测试流体包裹体的气相获得成分为H2O,少量CO2。研究结果表明初始成矿流体的性质为中低温、低盐度、成分以H2O-NaCl为主;早期成矿流体与地表水等流体的混合导致成矿元素的沉淀;该矿床是与闪长玢岩有关的、产于古生代浅变质岩系内的浅成低温热液银金矿床。

Sishanlinchang silver-gold deposit is a typical gold-bearing quartz veins deposit in Taipingling mineralization belt.The ore-forming fluid characteristics and element precipitation have been investigated by using microthermometric measurements and Raman microprobe,to systematic study the fluid inclusions in its mineral quartz.Results have shown that:1)The fluid inclusion type is simple,it is a gas-liquid twophase inclusion;2)The uniform temperature obtained by microscopic temperature measurement is between 152 and 320℃,the salinity of the ore-forming fluid is 4.18-13.62 wt%(NaCl),and the density is 0.73-0.91 g/cm-1;3)The compositions of the volatile are mainly H2O and a little of CO2.The research results show that the properties of the initial ore-forming fluid are medium-low temperature,low salinity,and mainly composed of H2O-NaCl;the mixing of early ore-forming fluids with surface water and other fluids leads to the precipitation of ore-forming elements;this deposit is a combination of diorite Rock-related and low-temperature hydrothermal silver-gold deposits produced in paleozoic metamorphic rock series.