祁漫塔格中段花岗岩型铀矿化特征及其找矿前景

Characteristics of Granite-type Uranium Mineralization and Exploration Prospect in the Middle of Qimantage Mountain Range

祁漫塔格中段目前已发现了黑山铀矿点和小狼牙山南、西大沟脑、西沟等4处铀矿化点,矿化赋存在海西印支期花岗岩与古元古界金水口群的接触带附近,受接触带附近的断裂构造控制明显,与赤铁矿化、硅化和绿泥石化蚀变关系密切。黑山铀矿点矿石的电子探针分析结果表明,矿石中含有沥青铀矿和硅钙铀矿、钒钙铀矿、硅钾铀矿等。区内经历了加里东、海西、印支和燕山期多次构造岩浆活动,断裂构造发育；金水口群变质岩和印支燕山期二长花岗岩铀含量可达（5~12）×10-6,是成矿良好的铀源条件。因此,笔者认为该区具有较好的找矿前景。

In the middle of Qimantage mountain range,one uranium occurrence and four mineralization spots have been found,there are Heishan occurrence,Langyashan South,Xidagounao and Xigou spots. The mineralization is distributed near the contact zones between Variscan Indosinian granitoids and Pal-eoproterozoic Jinshuikou group,which are controlled evidently by the faults and often accompanied with hematitization,silicification and chloritization.Electron microprobe analysis showed that ore in Heishan occurrence contains native uranium mineral of pitchblende and secondary uranium mineral of uranophane, Tyuyamunite,boltwoodite.Because uranium content of Paleoproterozoic metamorphic Jinshuikou group and Indo Yanshanian adamellite content can reach （5~12）×10-6 which provide good uranium source;the region also experienced multi tectonic magmatic activity of Caledonian,Variscan,Indo China and Yanshan and faults are well developed.Therefore,the middle of Qimantage mountain range has good ex-ploration prospects.