辽宁四道沟金矿成矿流体地球化学研究

Study of metallogenic fluid geochemistry of Sidaogou gold mine.

辽宁四道沟金矿定位于鸭绿江断裂西侧。其容矿围岩为辽河群盖县组的变质岩系。成矿流体中富含 Na+ 、Ca2 + 、Cl-离子和还原性气体 (CO、N2 、CH4、H2 )。成矿温度为 16 0～ 2 80℃ ,成矿压力为 45～ 5 5 MPa。Eh、p H、f O2 和氢氧同位素值表明 ,成矿为相对弱还原环境 。

Sidaogou gold mine is located in the west side of Yalujiang river fault and hosted in the metamorphic rock series of the Gaixian Formation of the Liaohe Group. Its ore forming fluids are enriched in Na +, Ca 2+ and Cl - ions and reducing gases (CO, N 2, CH 4 and H 2). The values of metallogenic temperatures and pressures are 160~280℃ and 45~55MPa, respectively. The values of pH, Eh, f O 2 , δ 18 O and δD show that the ore forming environment and fluids are near neutral and weak reducing mixed fluids, respectively.