论广西横县南乡金矿成矿地质背景及矿床成因

ON GEOLOGICAL BACKGROUND AND GENESES OF GOLD DEPOSIT OF NANXIANG HENGXIAN GUANGXI

广西横县南乡金矿区是广西金矿储量达中型的少数矿区之一；所处区域构造位置独特，赋矿层位新，地表岩浆岩出露少，导矿构造规模较大，容矿构造发育，金矿石矿物成分简单，矿石类型多样，矿体形态较复杂；围岩蚀变发育，以硅化为主；金与砷汞元素关系较密切；石英脉矿物与包体碳、氢、氧同位素、包体成分、温度等表明主成矿过程具有低温热卤水活动特征；成矿具有多期性，时代较新，为白垩系晚期至第三系早期；金矿成矿阶段与矿物生成次序、矿物世代、围岩蚀变类型、热液性质、古潜水面、构造活动等关系密切。依此提出了找矿标志、成矿模式和成矿预测。

Nanxian Hengxian gold deposit is one of medium- size gold deposits found in Guangxi. It is located in special regional tectonic. The ore- hosting beds occur in lower Cretaceous. The magmatic rock on the terrene narrowly exposed. The structures of ore-conduct-containing are development . The minerals of gold ore are a few, but ore type is various, the morphology of ore is complex. The wallrock alteration predominating silicification is strong. Gold is closely associated with mercury and arsenic. The ore-bearing strata are younger in age. The mineralization is multi-stage. It is closely related to such factors as mineral sequence, mineral generation, alteration type of wallrock, hydrothermalism, paleoground water level and structure activity. The authors point out ore guide of prospecting, metallogenic model and metallogenic prognosis.