Abstract:

This paper describes the progress of new research about sandstonetype uranium deposits from elemental geochemistry, isotopic geochemistry and organic geochemistry in the Northern Ordos Basin. Through elemental geochemistry, researchers understand the geochemical characteristics of ores and wall rocks, the geological environment of uranium mineralization and the relationship between ores and wallrock. The stage of uranium mineralization period was determined by isotopic geochronology. The researchers constructed the areas thermal history by fission tracks. Oreforming age similar to thermal history suggests the link between the oreforming and the tectonic evolution. The uranium source, the source of the oreforming fluids and the role played by organic matter in uranium have been discussed by the comprehensive consideration of the results of isotopic geochemistry, organic geochemistry and fission track studies.

Key words:  elemental geochemistry, isotopic geochemistry, organic geochemistry, fission track, uranium deposit, North Ordos basin