吐哈盆地中侏罗统西山窑组砂岩主量元素特征及指示意义

Characteristics and Indicative Significance of Major Elements in Sandstone of Xishanyao Formation of Middle Jurassic in Turpan-Hami Basin

结合前人研究资料及中东部西山窑组砂岩物质组成特征和形成构造背景条件,分析吐哈盆地整体铀矿成矿条件。通过地球化学方法对比吐哈盆地东西部中侏罗统西山窑组砂岩主量元素特征,发现吐哈盆地东西部西山窑组砂岩主量元素组成上具较高的相似性,与PASS相比表现出高SiO2,其余组分较低特征。吐哈盆地东西部砂岩源岩风化程度具很高的一致性,西山窑组砂岩源岩均来自中酸性岩石,西山窑组砂岩形成于稳定的构造背景环境。对比发现,吐哈盆地东西部砂岩主量元素成分及形成构造背景具很高的一致性,结合前人对十红滩铀矿床的研究,认为吐哈盆地大面积铀成矿具很大潜力。

In this paper,the metallogenic conditions of uranium in the whole Turpan Hami basin are analyzed based on the previous research data and analyzed the material composition characteristics and formed tectonic background of sandstones in the Xishanyao Formation in the East Central China and the tectonic background conditions.Through comparative analysis,it is found that the sandstones in eastern and Western Turpan-Hami Basin have high similarity in the composition of major elements.Compared with PASS,the sandstones in eastern and Western Turpan-Hami Basin have higher SiO2 content and lower other components.The weathering degree of sandstone source rocks in eastern and Western Turpan-Hami Basin is highly consistent.The source rocks are all from intermediate-acid rocks and formed on stable tectonic backs Scenery environment.Through comparison,it is found that the main element composition and tectonic background of sandstone in the East and west of Turpan Hami basin are highly consistent.Combined with the previous studies on the Shihongtan uranium deposit,large-scale uranium mineralization in Turpan Hami basin has great potential.