柬埔寨柏威夏罗文德邦铜矿地质特征及找矿标志

Geological Characteristics and Prospecting Signs of Copper Deposit in Roman Tam County of Preah Vihear Province in Cambodia

对柬埔寨柏威夏罗文德邦已发现的铜矿体进行区域成矿地质条件、矿区地质特征、矿体特征及矿石特征进行分析研究;认为矿区含矿岩石为闪长玢岩类,含矿岩体与围岩同为二叠系的火山岩—次火山岩;含矿岩体受NWW向的构造控制;岩浆的侵入成岩和含矿热液作用,使近矿围岩受到广泛的交代蚀变,在岩浆沿构造上升交代蚀变过程中,岩浆中的黄铜矿、黄铁矿开始结晶熔离,岩浆上升达到赋存空间,使岩石绢英岩化,同时使有益元素黄铜矿、黄铁矿形成工业矿体,有局部的地段沿微型裂隙充填形成含矿石英脉和黄铜矿细脉;该矿床属热液交代-充填型;磁铁矿化、黄铁矿化、钾长石化、蚀变带等标志是该区的主要找矿标志。结合柏威夏罗文德邦铜矿床特征与区域上已发现的矿点综合分析,认为该区有着良好的找矿前景。

Through analyzing and discussing regional metallogenic geological conditions, geological characteristics, orebody characteristics, and ore characteristics of the copper ore body in mining area which has been found in Roman Tam County, Preah Vihear Province of Cambodia, it is regarded that the ore bearing rock is diorite--porphyrite class. Both ore bearing rocks and its surrounding rocks are Permian volcanic rocks subvoleanic rocks. The ore bearing rock is controlled by the structures with the trend of NWW. Because of magma intrusion and ore bearing hydrothermal, the surrounding rocks have experienced metasomatic alteration widely. In the alteration process, chalcopyrite and pyrite in the magma began to crystallize and liquate. Magma rose up to the ore occurrence space and caused sericitolite mineralization. Meanwhile, the beneficial elements of chalcopyrite and pyrite formed local industrial ore bodies. In partial areas, magma filled rocks along microfractures to form ore bearing quartz veins and veinlets chalcopyrite. This deposit belongs to hydrothermal metasomatic--filling type. Magnetite mineralization, pyritization, potash feldspathization, alteration and other signs are main prospecting signs of the area. According to copper deposit characteristics in Roman Tam County of Preah Vihear Province and comprehensive analysis of ore occurrence which has been discovered, it is regarded that there is a good prospecting potential in this area.