VMS矿床成矿流体的组成,来源及作用机制

ＶＭＳ矿床是一类非常重要的有色金属矿床，其成因与火山岩及海水密切相关。流体包裹体成分及氢氧同位素特征表明成矿流体主要为加热的海水，可能有岩浆水的参与。渗入火山岩层的海水在深部热源作用下发生对流，并萃取了火山岩中的金属。成矿流体在海底喷溢，与海水混合反应，造成矿石沉淀。整个成矿演化过程经历了复杂的流体—岩石反应和流体—流体反应，这些反应在成矿中起着非常重要的作用。

ORE FORMING FLUIDS OF VMS DEPOSITS: COMPOSITION,ORIGIN AND PROCESS MECHANISM

VMS deposit,voicanic associated massive sulfide deposit, an important type of nonferrous deposit is closely associated with volcanic rocks and sea water in genesis. Its composition and H,O isotopic features in fluid inclusions suggest that the ore forming fluid is mainy from the heated sea water,probablly mixed with some magmatic water.The sea water permeated in the volcanic rocks convected by heat flux from depth,and leached metals from the volcanic rocks.The ore forming fluid vented on the sea floor and reacted with sea water.resulted in ore deposition. A series of complicated fluid rock reactions and fluid fluid reactions play very important roles for the VMS mineralization.