The lacustrine-humate model is derived from the observed occurrence of tabular uranium ore deposits in sandstone beds that consistently lie close to a distinct type of offshore-lacustrine gray mudstone. This report attempts to synthesize field observations, literature data, and preliminary laboratory work into an hypothesis or model of formation of this type of tabular uranium ore deposit* The basic premise of the model is that humic and fulvic acids generated in the offshore muddy sediments of humus-bearing lakes were expelled by compaction or seepage into nearby sandstone beds where the organic acids were fixed as tabular humate deposits. Subsequently, uranium-bearing ground water passed through the sandstone where the humate fixed and concentrated the uranium, forming tabular sandstone uranium deposits.
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