准噶尔盆地砂岩型铀矿成矿环境与找矿方向研究

摘要

准噶尔盆地位于新疆北部,是我国重要的多能源矿产产出盆地之一.本文首先从基底构造、中新生代构造演化、沉积建造特征、后生蚀变特征等角度阐述了准噶尔盆地砂岩型铀矿的区域成矿环境条件,在此基础上分析了已知铀矿化的发育特征,划分了已知铀矿化的类型,提出了不同盆段铀矿化的成因地质模式.最后,从全盆尺度对盆地资源突破方向进行了探讨,认为该盆地具有良好的基底演化条件,砂岩型铀矿总体成矿潜力好,层间氧化带型应作为铀资源突破的主攻类型,首选目标层位为中—下侏罗统,首选突破盆段应为东准地区,其次为西准和什托洛盖坳陷等地区;西北缘“油气掩盖”型砂岩铀矿亦具备较大的找矿潜力;盆地南缘需坚持“强中找弱”,以萨瓦布齐式铀矿为重点找矿方向.%The Junggar Basin,located in the north of Xinjiang,is one of the most important basins producing multi-energy resources.On the basic study of basement structure,Mesozoic—Cenozoic tectonic evolution,sedimentary formation and epigenetic alteration,U-metallogenic characteristics have been analyzed and the types of U-mineralization also been divided in this paper.Moreover,Geological models in different basin section are established.And the direction of resource breakthrough is discussed on the whole view of the basin.The basin basement is benefited for U-mineralization and the general potential conditions of U-mineralization are favourable.Interlayer oxidation zone type uranium deposit should lay stress on prospecting orientation in the whole basin.The most favorable prospecting formation are the Lower—Middle Jurassic strata,and the beneficial positions lie in the the eastern of Junggar Basin,following in the western area and the Heshituoluogai depression.Oil-covered type Umineralization also has a greater potential for prospecting in the west part of Junggar basin while Savoy bucchi type U-deposit in the southern margin being as the important direction for prospecting.