肖家山金矿属于醴陵金矿田的一个典型金矿床。矿区主要出露的地层为中元古界冷家溪群，系一套巨厚的绿片岩相浅变质碎屑岩，为矿床的矿源层。区域岩浆活动强烈，主要出露中生代的花岗岩，为成矿提供了热源和动力。矿区褶皱、断裂构造发育，其中三斗田脆-韧性剪切带和雁林寺韧性剪切带为矿区主要的控矿容矿构造。矿脉主要产于断裂中，呈似脉状。矿床以热液成矿作用为主，成矿期可分为石英―黄铁矿阶段，含金石英―硫化物阶段，石英―铁白云石阶；矿区流体包裹体均为富液相的气液两相包裹体，流体均一温度介于180℃~360℃之间，盐度为3.12%~9.84%(wt%NaCl equiv)，流体的密度介于0.67 g/cm3~0.92g/cm3。综合分析矿床是一中高温热液叠加改造型金矿床。%Xiaojiashan gold deposit was a typical gold deposit in Liling gold ore field.The main outcropped strata in the mining area were Mesoproterozoic Lengjiaxi Group,which was a set of thick green schist facies epimetamorphic clastic rock and was the ore source bed of the deposit.With the intensive magmatic activities in this area,mainly outcropped Mesozoic granite provided heat source and dynamic force for mineralization. Among the developed folds and faulted structures,Sandoutian brittle-ductile shear zone and Yanlinsi ductile shear zone were the primary ore-controlling and host structures in the mining area.Vein ores mainly oc-curred in the fractures in veinlike form.The deposit was mainly formed by hydatogenesis,and the minerali-zation periods included quartz-pyrite phase,gold-bearing quartz-sulfide phase and quartz-ankerite phase.The liquid inclusions in the mining area were rich-liquid phase gas-liquid inclusions,while the homogenization temperature of fluid ranged between 180℃ and 360℃ and the salinity ranged between 3.12% and 9.84%(wt%NaCl equiv)and the density of fluid ranged between 0.67g/cm3 and 0.92g/cm3 .The comprehensive a-nalysis on the deposit suggested that the deposit was a medium-high temperature hydrothermal superimposed and reworked type gold deposit.
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