Abstract
Uranium is so intimately associated with carbonaceous matter in marine black shales and some sands tone-type uranium deposits that it is said to be “fixed” by organic matter. But different kinds of organic matter are not of 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 certain types of organic matter (for example, humus or bitumen) is described in this paper from geochemical viewpoint.Many uranium deposits and uranium occurrences have been found both at home and abroad. The distribution and existing forms of uranium in these deposits, and the concentration of uranium and element association in the ore are directly or indirectly related to organic matter. This paper is intended to discuss the types of natural organic matter and the mechanism of uranium transport and enrichment by organic matter, on the basis of author’s research work in conjunction with previous data.
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