【摘要】 屯林矿床位于十万大山盆地东南侧,是我国典型的砂岩型铀矿床之一。十万大山盆地是大型中、新生代陆相盆地,总面积18 000 km2,盆地基底为前中三叠统及印支期花岗岩,盖层为上三叠统到古近系,盆地内构造发育;在盆地中发现多个铀异常点,大多数产于侏罗系,375铀矿床就是其中之一。该文通过对375铀矿床见矿孔ZK9901,进行地质、地球化学研究,对375矿床的形成环境及过程进行探讨。结果表明,在干旱-半干旱环境的交替行进下,利用泥岩的不透水性和砂岩透水性的相互作用,并经过后期的热液改造作用,造成了铀的富集沉淀。碎屑物质来源具有同源性,形成的构造环境为大陆岛弧环境。更多还原

【Abstract】 The Tun Lin ore deposit is located in the southeast of shiwandashan basin,which is one of the typical sandstone- type uranium deposits in China. shiwandashan basin is a large mesozoic and cenozoic continental basin,with a total area of 18 000 km2,basin basement for the former triassic and indosinian granite and the cap for the Triassic to the paleogene system,basin structure is development. Multiple uranium anomaly points had been found in the basin,most of which are found in Jurassic,375 uranium deposit is one of them. This article through geological and geochemical study of deposit ore hole ZK9901 in 375 uranium,discuss the formation environment and process of 375 deposit. Results showed that under the drought- semi- arid environment alternative travel,using the interaction that waterproofness of mudstone and permeability of sandstone,and pass by the late hydrothermal alteration,caused the enrichment of uranium deposits. Detrital material source was homologous,formation of the tectonic environment is continental island arc environment.更多还原