【摘要】 云南西部 (怒江以西 )地区分布着数十个新生代盆地 ,多为小型山间盆地。盆地基底为花岗岩和中高级变质岩 ,铀源条件良好。各盆地面积不大 ,沉积厚度不等。沉积物组成为山区河流冲洪积相、湖沼相的灰色含煤建造 ,岩石物质成分与基底岩石具明显继承性。地层结构具砂、泥岩互层特点 ,砂岩岩性松散 ,渗透性好 ,赋存承压水 ,具有形成后生水成铀矿床的有利条件。更多还原

【Abstract】 Dozens of Cenozoic small intermountain basins are distributed over the region to the west of Nujiang River in west Yunnan. Basement of the basins is composed of Uranium-bearing granite and high-and medium-grade metamorphic rocks.The basins are filled with fluvial sediments and limnetic coal-bearing formation which are characterized by mudstone alternating with sandstone. The sandstone is characterized by good water permeability which is favourable to the formation epigenetic U deposits更多还原