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Uranium is so intimately associated with carbonaceous matter in marine black shales and somesandstone-type uranium deposits that it is said to be “fixed” by organic matter. But differentkinds of organic matter are not of equal importance in the geochemistry of uranium. The natureand origin of organic matter in uranium deposits and its role in the transport and concentrationof uranium are different from place to place. The reason why uranium is closely associated withcertain types of organic matter (for example, humus or bitumen) is described in this paper fromgeochemical viewpoint. Many uranium deposits and utanium occurrences have been found both at home and abroad.The distribution and existing forms of uraniumin these deposits, and the concentration of urani-um and element association in the ore are directly or indirectly related to organic matter. Thispaper is intended to discuss the types of natural organic matter and the mechanism of uraniumtransport and enrichment by organic matter, on the basis of author’s research work in conjunctionwith previous data.
Uranium is so intimately associated with carbonaceous matter in marine black shales and somesandstone-type uranium deposits that it is said to be “fixed” by organic matter. But differentkinds of organic matter are not not equal importance in the geochemistry of uranium. The nature and origin of organic matter in uranium deposits and its role in the transport and concentration of uranium are different from place to place. The reason why uranium is closely associated with types of organic matter (for example, humus or bitumen) is described in this paper from geochemical viewpoint. Many uranium deposits and utanium occurrences have been found both at home and abroad. The distribution and existing forms of uraniumin these deposits, and the concentration of urani-um and element association in the ore are directly or indirectly related to organic matter. is intended to discuss the types of natural organic matter and the mechanism of uranium transport and enrichment by organic ma tter, on the basis of author’s research work in conjunction with previous data.