衡阳盆地北缘盐田桥铜矿床成矿构造地质地球化学特征

Geological and Geochemical Characteristics of Ore Controlling Structure of the Yantianqiao Copper Deposit in the Northern Margin of Hengyang Basin

盐田桥铜矿床位于长寿-衡阳-观音阁断裂成矿带中部,属茶恩寺铜铅锌多金属成矿区内,是以铜矿为主,共(伴)生有铅锌矿等高-中温热液充填交代型矿床。以构造地球化学找矿为出发点,在研究区域构造地质背景、矿区构造地质特征及控矿因素的基础上,重点对F_1断裂构造岩主量元素、微量元素特征进行了分析,发现F_1中Cu、Pb、Zn、W等成矿元素有较大变化,说明元素的富集与断裂的活动有着极为密切的成因关系。富含成矿元素热液沿F_1断裂消弱带运移,并充填到构造裂隙中,与围岩发生交代作用而富集成矿。

The Yantianqiao copper deposit is located in the middle of the Changshou--Hengshan--Guany- inge fault, which is one part of the Chaensi lead-zinc metallogenic province. It mainly includes copper ores, and is companied with coexisting high-to medium-temparature hydrothermal filling and metasomatic depos- its like tungsten ores. From the perspective of geochemical prospecting in fault structures, and based on the geological setting of the mining area, geological characteristics of fault structures and ore-controlling features, this paper analyses the main elements and trace elements of the fault structure of F1 fault. A great variationis found among the Cu, Pb, Zn, W and other mineralization elements in F1. The variation shows a close relationship between the enrichment of elements and the activities of the fault structure. Mineralization-element-rich hydrothermal liquids move along and fill up the fissures of the fault F1. Due to the movement of these liquids, their metasomatism with wall rocks formed Yantianqiao deposit.