一个罕见的铀钨矿化带的成矿特征

THE METALLOGENETIC CHARACTERISTICS OF A RARE URANIUM-TUNGSTEN MINERALIZED ZONE

一个以铀钨为主的铀钨锡多金属矿化带，沿某复式花岗岩体东侧接触带分布，有５０多个矿床和矿点，其矿床（化）类型有岩浆型、伟晶岩型、夕卡岩型、高中低温热液型等，组成一个完整的花岗岩成矿系列。其中低温热液铀钨矿床是一个矿床新类型，具有独特的地质地球化学特征，工业意义也较大。

The uranium-tungsten minenlized zone in northwestern Guangxi is a U- W- Sn -Cu- Pb - Zn polymetallic mineralized zone, in which the U- W mineralization is dotninant. lt is distributed along the eastern contact zone of a complex granite mass and is about 100km long. There are more than fifty ore deposits and ore spots in it. The metallogenedc elements of the zone are U, W, Sn, Mo, Cu, Pb, Zn, and so on, which form many associadons, such as U-W, W, W-Sn, W-Sn-Cu, Sn-Cu, Cu-Mo, W- Pb, Cu, Pb, Pb-Zn, etc. The types of deposit(mineralization are ( 1 ) magmatic, pegmatite, skam deposib fomed by the mineralization of the granitic magma (2) hypothermal, mesothemal, and epithenmal deposits formed by taking the solidified granite as the main reforming materials, and (3) streat tin deposit, etc. They make up a very intact metallogenetic series of granite. The epithermal U- W deposit is considered as a new type for its unique geologic and geochenutcal chancters, such as U-W patagenesis and latge dme gaps( > 40Ma) between ores and gratite, therefore, is of important industrial significance. Such mineralized zone has not been reported yet.