汉南杂岩与金成矿特征

汉南杂岩区位于扬子地台北缘,围岩为元古界绿片岩 勉县—洋县深大断裂系统在成岩、成矿与盆地形成方面占有重要的地位.杂岩体由斜长花岗岩、二长花岗岩、钾长花岗岩、石英闪长岩和辉长辉绿岩组成.金矿化类型主要有石英脉型和蚀变岩型,与接触带、断裂带、蚀变带有关,蚀变后岩石矿物成分变化.使金重新分布,砂金分布与金源、地貌和新构造运动关系密切.

THE CHARACTERISTIC OF HANNAN COMPLEX AND GOLD MINERALI ZATION IN SOUTH SHANXI

Hannan complex region is located in the north border of Yangzi platform and their wall rocks are green schist series of upper Proterozoic. Deep fault systems played an important role in diagenesis, metlallogcnesis and the formation of inland basins. The complex rocks are consisted of mainly plagiogranite, monzonitic granite, K-feldspar granite, quartz diorite and gabbroic diabase, etc. The mineralization types include quartz-vein and alteration-rock types in association with fracture zone, alteration zone, silicified zone and contact zone of granitic bodies. The alteration modified the mineral composition of rocks and also redistributed gold in rocks. Distribution of gold placer deposits is closely related with gold-bearing horizon, morphology and tectonism.