Uranium Deposits of Erlian Basin (China): Role of Carbonaceous Debris Organic Matter and Hydrocarbon Fluids on Uranium Mineralization

The relationship of sedimentary organic matter, oil-gas and sandstone-type uranium (U) deposits is the key problem U-mineralization. Whether migrate hydrocarbons participate in U-mineralization still a controversy. Typical U Erlian Basin northeast China have been investigated through detailed petrography, mineralogical, micro spectroscopic, geochemical C-isotope studies. Petrographic observations, Microscopic Laser Raman Spectroscopic, Infrared Spectroscopic Scanning Electron Microscope analyses indicated there are three types matter (including carbonaceous debris migrated hydrocarbons). A significant amount was associated with pyrites, clay minerals either coexisted hydrocarbon fluids. There at least two stages mineralization events, stage I related to (syngenetic pre-enrichment stage), II mobile fluids (main stage). Therefore, our results support that were involved as reducing agent for main after synsedimentary mineralization.