二连盆地巴彦乌拉铀矿床目的层粘土矿物特征及其意义

二连盆地巴彦乌拉铀矿床是我国典型的古河谷砂岩型铀矿床,铀主要经潜水-层间氧化作用富集成矿。为了研究其粘土矿物组成、含量、形态特征及其产状,对区内目的层粘土矿物进行了X射线衍射、扫描电镜及能谱分析。分析结果表明,二连盆地巴彦乌拉铀矿床目的层粘土矿物成分基本一致,主要为蒙脱石、高岭石、伊利石,个别样品中见少量绿泥石。蒙脱石集合体呈花朵状、片状,高岭石集合体呈书页状、扇状,伊利石集合体呈片状,绿泥石集合体呈玫瑰花朵状。粘土矿物以分散质点式不完全充填于孔隙中和薄膜式贴附于颗粒表面。根据分析结果,文章总结了该矿床氧化带分带粘土矿物特征,并探讨了粘土矿物对砂岩的孔隙度和渗透率的影响及其与铀成矿的关系。

Characteristics and Significance of Clay Minerals of Purpose Layer in Bayanwula UraniumDeposit of Erlian Basin

Bayanwula uranium deposit of Erlian basin is a typical ancient valley sandstone uranium deposits in China, Uranium is enrichment mainly by the diving-interlayer oxidation. In order to study the clay mineral composition, content, morphological characteristics and occurrence, by XRD and SEM-EDS technology analysising purpose layers clay minerals. The results show that: The clay mineral composition of Bayanwula uranium deposit in Erlian basin is almost the same, mainly for the montmorillonite, kaolinite, illite and a small amount of chlorite in Individual samples. Montmorillonite collection are flower-like, flake, kaolinite are book collection, fan-shaped, collection of illite are plate shaped, chlorite collection are rose flower. Occurrence of clay mineral disperse phase point incomplete filling in pore and diaphragm attached on the particle surface. According to the results, This article summarizes zoning oxidation zone clay mineral characteristic of the deposit, discussing the influence of clay mineral characteristic to the porosity and permeability of sandstone and its relationship with uranium mineralization