摘要
本文从盆地结构、沉积盖层构造特征、盆地沉积的岩相条件及岩石地球化学特征、区域水文地质条件以及沉积盖层中的后生改造作用等方面，分析准噶尔盆地北西部层间氧化带砂岩型铀矿形成的地质条件。认为该区具有丰富的铀源蚀源区；具备适合层间氧化带发育的沉积地层组合；从蚀源区到河床相发育地段普遍存在次生氧化砂体，其前缘存在还原层和次生还原障；沉积盖层构造特征反映区域为一较为稳定的次造山作用区，具备了抬升萎缩阶段的次生活化改造条件，区内沉积盖层中存在明显的后生成矿作用。
From various aspects such as the basin structures, structure featrues of the sedimentarycover, lithofacies features of basin sediments, geochemical characteristics of sedimentaryrocks, regional hydrogeologic conditions and epigenetic reworking of the sedimentary coverand so on, this paper analyzes the metallogenic conditions of sandstone type uranium deposits in interlayer oxidation zone in the northwest of Junggar basin. The author proposesthat the area has abundant uranium sources, and possesses favourable stratigraphic combinations for the development of interlayer oxidation zone. Secondarily oxidized sandstone bodiesare universally present at places from the source area to stream channel factes. Reducingbeds and secondarily reducing barrier are developed at the front of the secondarily oxidizedsandstone body. The tectonic features of ti.e sedimentary cover indicate that the area belongsto a relatively-stable suborogenic region and possesses secondary mobilization and reworkingconditions during the uplifting and contraction stage of the basin. Epigenetic metallization isevident in the sedimentary cover of the basin.
出处
《铀矿地质》
CAS
CSCD
1997年第2期97-97,13(2),共2页
Uranium Geology
关键词
层间氧化带
砂岩型
铀矿
成矿条件
铀矿床
interlayer oxidation zone, Sandstone type uranium deposit, Junggar basin,Metallogenic condition analysis
