The Relations Of Uranium Mineralization And Organic Matter In Uranium Deposit373

The373uranium deposit,as a typical carbonanceous-siliceous-pelitic rock typeuranium deposits in South of China which has developed in a sequence including theweakly silicified black mudstone, silicified bioclastic limestone and the gradationa lrocks between them. The373uranium deposit is rich in organic matter andpyrite.There are close relationships between organic matter and uraniummineralization in a lot of uranium deposits. But few people have done the relationshipbetween uranium mineralization and organic matter of carbonanceous-siliceous-peliticrock type uranium deposit. In this paper, the author makes researches by support ofthe project of National Natural Science Fund （project number:41173059) ongeological and sampling analysis to study the sedimentary facies of373uraniumdeposit, the type of organic matter, the maturity of organic matter and the role oforganic matter in uranium mineralization process. we can get the following mainconclusions:（1）I mainly studied the sedimentary environment in the373uranium deposit.Sedimentary environment is the decisive factor for the formation of sedimentary rocksand the characteristics of sedimentary organic matter. According to the ancientgeographical environment figures from all periods in guangxi province, the area fromthe Cambrian to the neogene has experienced the deep sea facies belt, uplift belt,foreshore facies belt, nearshore facies, basin facies, isolation platform facies, basinfacies, restricted platform facies, open platform facies belt, uplift belt, basin facies,open platform facies belt, uplift belt, isolation platform facies zone, continental shelffacies, uplift belt, then the uplift belt is continued to the neogene.(2) I also studied the type and maturity of organic matter. This article is mainlyon the basis of chloroform bitumen "A" components to differentiate types of organicmatter. The chloroform bitumen "A" components all fall ⅡBarea,so the type of organic matter in the study area is mixed type bias to the humic type. The maturity oforganic matter is relatively low on the basis of Tmax,at the immature-low maturestage.Compared with the surrounding rock,the ore has gone through higherpaletemperature on account of the effect of hydrothermal and fault. The type and thematurity of organic matter result in the generation of large amount of humic acidduring thermal evolution that could be preserved in strata.(3) The role of organic matter in uranium mineralization process was studied Wecan get S0,S1,S2through rock pyrolysis analysis.These samples from different placehave a similar growth on basis of the line chart of S0,S1,S2. That is to say, thesesamples have the same nature.In normal conditions the samples from different stratashave different properties.This is because the different stratas have been eroded by alarge-scale hydrothermal.The active thermal fluid between different stratas is resultedin the similar properties of the samples. It has a very positive meaning for the uraniummineralization. The contents of chloroform bitumen A of organic matter in themineralized layer are0.4710.42ug/g,Asphaltene is the main component ofchloroform bitumen A. The correlation between chloroform bitumen A anduranium content is high，as well as the correlation between the content of asphalteneand uranium content.Comprehensive study shows that the functions of organic matterin373uranium deposit are mainly adsorption,complexation and reduction.