南秦岭西亚带碳硅泥岩型铀矿化与沉积环境分析

碳硅泥岩型铀矿为沉积内生型,具有明显的层控特征,沉积相与铀矿化关系往往是碳硅泥岩型铀矿床的研究重点.南秦岭西亚带碳硅泥岩型铀矿床的成因类型主要为沉积-热液叠加改造型,赋矿层位仅局限于中、下志留统炭硅质、泥质的富铀地层中.通过对研究区区域地质背景,沉积环境以及有利沉积相对铀成矿的控制作用研究,指出碳酸岩台地中发育的水下坳陷相整体控制着铀矿化的分布,而坳陷相中发育的硅灰岩透镜体是铀矿化定位的前提.

The Sedimentary Environment of Carbonaceous-Siliceous-Pelitic Rock Type Uranium Mineralization in Western Subzone,South Qinling

The carbonaceous-siliceous-pelitic rock type uranium deposits are evidently controlled by strata.Relationship between Sedimentary phases and uranium mineralization is the key point of research on this type.The main genesis of such deposits in western subzone of South Qinling is hydrothermal alteration superimposed on sedimentation.The ore-hosting beds are only constrained in uranium-rich constructions in Middle-Lower Silurian.Integrated analysis of regional geological setting,sedimentary environment and uranium-controlling of favorable sedimentary phases in this paper proposes that the distribution of uranium mineralization was controlled by the whole underwater depression phase in carbonatite platform,and that the uranium location is premised by siliceous-limestone lenses developed in the depression phase.