A Preliminary Analysis on Organic Geochemical Characteristics of the Shihongtan Sandstonetype Uranium Deposit in TurpanHami Basin

Key words: 
• organic carbon /
• soluble organics /
• acidolysis hydrocarbon /
• organic geochemistry /
• sandstone uranium deposit /
• interlayer oxidized zone /
• Shihongtan

Abstract: The Shihongtan uranium deposit in TurpanHami basin is an interlayer oxidized zone type sandstone uranium deposit, which occurs in the coalbearing detrital rocks of braided meandering stream facies in the Middle Jurassic Xishanyao Formation. There is a great deal of organic matter in the orehosting bed. There is distinct content of organic carbon, soluble organic matter, acidolysis hydrocarbon in various geochemistry belt rocks, and the maximum content in the ore belt. Organics carbon mothermaterial type is sapropelic humus, organic matter is under mature stage. Acidolysis hydrocarbon is coalgas type. Uranium content in rock is positively correlative to soluble organics and acidolysis hydrocarbon by statistical count. The paper analyzed the role of organic matter in sandstone type uranium metallogenetic process, and concluded that the material decomposed under oxygenic condition is advantageous to uranium dissolution and migration in groundwater, material decomposed and polymerized under oxygendeficient condition forms reducing and adsorption geochemistry barrier for uranium precipitation, play an important role in uranium metallogenetic process.