Analysis of Advantageous Minerogenic Conditions of Lacustrine Mudstone-Type Uranium Deposit

In recent years,the uranium enrichment in the lacustrine dark mudstone of production grade,has been discovered in the Ordos Basin and Erlian Basin of China.The present paper describes the study of this lacustrine mudstone-type uranium deposit further by summarizing and analyzing the researches of black shale-type uranium deposits and the lacustrine mudstone-type uranium deposits in foreign countries combined with preliminary exploration on the Nuheting uranium deposits in the Erlian Basin and the uranium enrichment in southern Ordos Basin.The advantageous minerogenic conditions of the lacustrine mudstone-type uranium deposit are:①The existence of sufficient and sustainable uranium source.②High levels of adsorbents and reducing agents,with the adsorbents mainly including organic matter and phosphate,and the reducing agents mainly of organic matter and some sulfide represented by pyrite.③Low deposition rate and the longer anoxic sedimentary environment.④The mutation of the redox environment,the redox boundaries directly affecting the position of uranium mineralization.⑤Advantageous paleogeographic conditions,including relatively stable positive landform uplifting continuously and periodic alternating climate.