银山矿床成矿作用时空特征及矿床成因讨论

在对矿床地质地球化学详细研究的基础上，讨论了银山多金属矿床成矿作用的时空特征和矿床成因。研究表明，银山矿床的形成与燕山期第二阶段侵位的次火山岩具有密切的时空和物质组分的联系，然而，矿床与次火山岩都是深部隐估岩体岩浆分异的流体和熔体的产物，二者是同源但侵位有早晚的亲缘关系，矿床的成矿深化具有多期多阶段性。矿床分带上有多中心性、不对称性、叠加性和定性性。引起成矿物质沉淀的主要机制是注体的混合作用而不是

Metallogenic temporal-spatial characteristics and genesis of the Yinshan polymetallic deposit, Jiangxi Province

Based on detailed geological and geochemical researches,this paper has dealt with metallogenic temporal spatial characteristics and genesis of the Yinshan polymetallic deposit.Studies show that the formation of the Yinshan deposit is closely related to subvolcanic rock emplaced at the second stage of Yanshanian period in time,space and material components.The ore deposit and the subvolcanic rock are both products of fluids and melts formed by magmatic differentiation of a concealed intrusive body at depth,exhibiting kindred relationship but not emplaced simultaneously.The ore forming evolution of the ore deposit shows multi phase and polystage features,and the metallogenic zoning is characterized by multicenters,asymmetry,superimposition and directing property.The main mechanism responsible for the deposition of ore forming materials is the mixing of fluids rather than the boiling.In comparison with similar deposits abroad,the Yinshan deposit might be classified as a transitional deposit.Nevertheless,whether there exists a porphyry copper deposit at depth remains an interesting problem to be solved in future.