东天山西滩浅成低温热液型金矿成矿地质地球化学动力学

GEOLOGICAL GEOCHEMICAL DYNAMICS OF ORE FORMATION OF EPITHERMAL GOLD DEPOSIT XITAN OF EASTERN TIANSHAN

西滩金矿床位于塔里木板块北缘晚古生代火山岛弧带，属典型的浅成低温热液石英脉型金矿。矿床控矿构造为破火山口放射状和环状断裂系统。成矿流体主要由大气降水热液组成，其运动状态表现为沿较宽大断裂裂隙快速（上涌）流动。沸腾作用是主要的一种动力成矿机制，成矿方式以充填作用为主。成矿反应系统包含成矿反应、控制反应及缓冲控制反应３类。

Xitan gold deposit is located in the volcanic island arc zone of Northern margin of Talimu plate in late Paleozoic era,which is typical epithermal quartzvein type deposit.The ore controlling structure might be composed of radial and circular faults in paleocrater.The ore forming fluid was derived mainly from meteoric hydrothermal solution,its flow state shows upper pouring out flow quickly in wider fault.Boiling is an ore forming dynamic mechanism,ore forming way is mainly filling mineralization.The hydrothermas ore forming system includes three types that ore forming reaction,control reaction, and buffer control reaction.The dynamic conditions play an important role in ore forming processes.