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一、地质概况四二一○砂岩铀矿床位于四川盆地东北部泥溪复向斜北东翼出露地层有白垩系剑门关组和侏罗系蓬莱镇组,由一套巨厚沉积之棕色砂岩、粉砂岩、泥岩夹浅色砂岩和砂砾岩组成。工业铀矿化即产于剑门关组底部“零”号浅色层中。矿化受地层、构造、岩相及岩性的综合控制。“零”号浅色层为一套河流相沉积,厚度约40米左右,系由多个迭瓦状排列的透镜状砂岩体所组成。在剖面上,按粒度由粗变细可将该浅色层划分为六个韵律。每个韵律底部通常为浅灰、灰、深灰色细砾岩或含砾砂岩,与下伏地层(或韵
I. Geological Background The sandstones of the Ya-210 sandstone are located in the northeastern wing of the Mudxi syncline in the northeastern Sichuan Basin with the Cretaceous Jianmenzhuan Formation and the Jurassic Penglaizhen Formation, and are composed of a vast set of brown Sandstone, siltstone, mudstone sandstone and sandy conglomerate. Industrial uranium mineralization that is produced in the bottom of Jianmenguan group “zero” light-colored layer. Mineralization by the formation, structure, lithofacies and lithology comprehensive control. The “zero” light color layer is a set of fluvial facies with a thickness of about 40 meters and is composed of a plurality of lens-shaped sandstone bodies arranged in a labyrinthine shape. On the profile, the light colored layer can be divided into six rhythms in terms of grain size by thickening. The bottom of each rhythm is usually light gray, gray, dark gray fine conglomerate or gravel sandstone, with the underlying strata (or rhyme