【摘要】 随着973项目和北方砂岩型铀矿调查工程的深入开展,笔者从中侏罗统直罗组成岩过程对铀成矿影响的角度,初步探讨了鄂尔多斯盆地东胜铀矿田成矿作用的若干问题,主要表现在以下几个方面:(1)鄂尔多斯盆地北部的古元古代孔兹岩带为东胜铀矿田中主要含铀地层-中侏罗统直罗组碎屑物、预富集铀的主要蚀源区;(2)直罗组在同生沉积过程中预富集的大量铀,为铀成矿提供了主要铀源;(3)早成岩作用下,直罗组沉积建造水将分散的、预富集的铀迁移至灰色砂岩中富集成矿,为成矿流体;(4)基于铀矿体产状及铀矿物与载铀介质的空间关系,成矿时期应为早白垩世末期,受直罗组早成岩作用制约。更多还原

【Abstract】 On the basis of in-depth studies supported by 973 programmme and sandstone-type uranium survey project, and in perspective of the diagenetic process of the Middle Jurassic Zhiluo Formation, the authors aim to discuss several issues on the metallogenesis of Dongsheng uranium orefield. The Paleoproterozoic Khondalite Belt in the northern Ordos Basin is the main provenance contributor to the pre-concentrated uranium in the syngenetic sedimentary process of the Middle Jurassic Zhiluo Formation. During the early stage of diagenetic process of the Zhiluo Formation, the pre-concentrated uranium was migrated to the grey sandstone by formation water preserved in Zhiluo Formation to further uranium mineralization,and modified by thermal fluid after diagenesis. Inferrring from the occurrence of uranium ore bodies, and the spatial relationship between uranium mineral and uranium-containing medium, the uranium mineralization period should be in the end of Early Cretaceous. The metallogenic process were under the controll of the early stage of diagenetic process of the Zhiluo Formation.更多还原