准噶尔盆地北部层间氧化带砂岩型铀矿形成条件分析

本文从盆地结构、沉积盖层的构造特征、岩相岩性条件、区域水文地质条件、还原介质条件等方面分析了准噶尔盆地北部层间氧化带形成的地质背景 ,认为该区具有丰富的铀源条件及适合层间氧化带发育的地层组合。区内普遍发育次生氧化砂体 ,其前缘存在还原障。基底的抬升使盖层具备了次生活化改造条件 ,盖层中发育明显的后生铀成矿作用。

ANALYSIS ON METALLOGENIC CONDITIONS OF SANDSTONE-TYPE URANIUM DEPOSIT IN INTERLAYER OXIDATION ZONE IN THE NORTH OF JUNGGAR BASIN,XINJIANG

Analysing the geologic background of interlayer oxidation zone in the north of Junggar basin from the aspects of basin structure, the structural feature and lithofacies and lithologic conditions of the sedimentary cover, as well as the regional hydrogeology and reducing medium of the sedimentary cover, this paper suggests that the study area possesses abundant uranium source and the stratigraphic combination favourable for the development of interlayer oxidation zone. Epigenetically oxidized sandstone bodies are widespread in the study area and at the front of the oxidation zone the reduction barrier exists. The uplifting of the basement made the cover favorable for the secondary activation and reworking, and epigenetic metallogenic process was developed.