川西义敦银锡多金属矿地质特征及成矿模式——以义敦夏塞银多金属矿为例

Geological Features and Ore-forming Model for the Ag-Sn Polymetallic Deposits in Yidun, West Sichuan——By the Example of the XiasaiAg-polymetallic Deposit

夏塞银矿是一个与燕山晚期壳源重熔形成的酸性岩浆侵入活动关系密切,由岩浆热液作用形成的充填—交代为主的银锡多金属特大型银矿床,主要表现为热液—充填交代银锡多金属矿化,局部有矽卡岩型矿化。成矿具有深源浅成特征,银矿化主要发生在中低温阶段,成矿主要受岩浆活动与断裂构造组合的控制。通过夏塞矿床成矿地质特征,对比矿床成因机制,建立成矿模式,对该区的找矿工作有一定的指导意义。

This paper deals with geological features and ore-forming model for the Ag-Sn polymetallic deposits in Yidun, West Sichuan exemplified by the Example of the Xiasai Ag-polymetallic Deposit. The Xiasai Ag deposit as a giant Ag-Sn polymetallic one is related to the Late Yanshanian granite. The hydrothermal filling and replacement Ag mineralization with local skarnization was formed in medium and low temperature stage and was controlled by magmatism and fracture structure. Ore material was derived from the depth.