川井坳陷赛汉组沉积物源分析及其对砂岩型铀成矿的控制作用

为明确晚白垩世赛汉期盆地沉积期构造分区、充填过程和沉积相空间分布,本文运用岩矿鉴定、重矿物分析、岩石地球化学特征分析等方法,讨论了川井坳陷赛汉组沉积物源,认为赛汉组碎屑岩具有低成熟度和近源堆积特征,重矿物成分主要以磁铁矿、石榴石为主,与蚀源区花岗岩相似;赛汉组稀土元素配分曲线表现为明显Eu负异常和右倾,微量元素曲线表现...

Sediment Source Analysis of Saihan Formation in Chuanjing Depression and Its Impact on Sandstone Type Uranium Mineralization

In order to clarify the structural division, filling process and the spatial distribution of sedimentary facies during the sedimentary period of the Saihanian Basin in the Upper Cretaceous, this paper discusses the sediments of the Saihan Formation in the Chuanjing Depression using methods such as rock and mineral identification, heavy mineral analysis, and rock-geochemical characteristics analysis. It is believed that the clastic rocks of the Saihan Formation have the characteristics of low maturity and close accumulation. The heavy minerals are mainly composed of magnetite and garnet, which are similar to the granites in the erosion source area; the rare earth element distribution curve of the Saihan Formation is obvious Eu negative anomaly and right leaning, the trace element curve shows the loss of high field strength elements P and Ti, which is similar to the Mesozoic-Late Paleozoic granite curve; it indicates that the sandstone clastics of the Saihan Formation mainly originate from the Permian to the third period in the erosion source area. The granite bodies of the Paleozoic period, combined with the lithology distribution of the basement of the erosion source area in the Chuanjing Sag, suggest that the uranium sources on both sides of the central uplift belt and in the southern part of the basin are significantly better than those in the northern erosion source area, and the overall uranium metallogenic potential is greater.