川西花岗岩型铀矿成矿条件与找矿方向

Metallogenic Conditions and Prospecting Direction of Granite-type Uranium Deposits in Western Sichuan Province

川西地区构造运动强烈,岩浆活动频繁,具有多期次、多阶段的特点,从加里东期到喜山期均有岩浆活动,以印支期最为强烈,分布较为广泛,岩石类型复杂。文章从成矿地质背景、岩体成因类型、花岗岩含铀性、控矿构造、热液活动以及典型铀矿化特征等方面,对川西地区花岗岩型铀矿成矿条件进行了分析,指出川西地区具备形成花岗岩型铀矿的基本地质条件,区内应以寻找花岗岩内外接触带型铀矿为找矿主攻方向。

Tectonic movement and magmatic activity is intensive and frequent in Western Sichuan which is characterized with multi-phase and multi-stage from Caledonian to Himalayan. Magamatism was especially intensive in Indosinian, which is widely distributed and with complex rock type. The forming condition of granite type uranium deposit in Western Sichuan was discussed in the geological background, genesis of granite, uranium content in granite, ore controlling structure, hydrothermal activity and typical mineralization, and the area was believed to bear the basic geological conditions for the formation of granite type uranium deposits, the main orientation of next step prospecting should be the inner and outer contact zone along the granite.