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Geologic Characteristics and Metallogenic Model of Nalinggou Uranium Deposit in Northeastern Ordos Basin
Pages: 283-292
Year: Issue:  z1
Journal: Uranium Geology

Keyword:  Ordos basinNalinggou uranium depositgeologic characteristicsmetallogenetic model;
Abstract: According to the research of geology features and mineralization geochemistry in Nalinggou uranium deposit,it was indicated that the deposit is typical sandstone with paleo interlayer oxidization zones.The deposit was directly controlled by Bojianghaizi fault and the derived fractures which are affect-ed by the new tectonic movement.Mineralization related alteration mainly represented by the paleo in-terlayer oxidization zones which range from acid related alteration of early paleo oxidation,slightly al-kaline alteration of later paleo oxidation to reduction of slightly alkaline alteration in the late stage.The evolution of alteration directly controls the epigenetic alteration mineralization of Nalinggou uranium de-posits.The features of reducing component in rich ore are the same as other sandstone uranium deposits, which mainly includes organic carbon, pyrite, sulfur and is closely related with uranium enrich-ment.Mineralization experienced four stages:pre enrichment deposition,mineralization with paleo in-terlayer oxidization,mineralization of interlayer oxidation transformation in late stage,and slightly al-kaline and reduction for ore bearing in later period.The metallogenic age of deposits were 84 ± 1 Ma, 61.7±1.8 Ma and 38.1 ±3.9 Ma.Based on the summary of metallogenic features for geological and geo-chemical mineralization,this paper established the metallogenic model of Nalinggou uranium deposit, and systematically divided the mineralization stages for location of different uranium deposits in Dongsh-eng region.
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