Chen, and 5 co-authors, reported in mid-2020 that the Qianjiadian uranium deposit is located in the Kailu Depression of Songliao Basin. It is a large-scale in situ leachable, roll-front uranium deposit in sandstone and they provided a typical case of the uranium deposits in the Songliao Basin. They evaluated the possible impact of oil and gas on reduction alteration, and other factors including low grade mineralization. The Qianjiadian uranium deposit is characterized as a typical roll-type deposit with interlayers in an oxidized zone. The occurrence of reductive low-permeability sandstone in uranium reservoirs controls the morphology of the uranium-rich orebody.
The authors proposed a metallogenic model involving multi-stage superposition characterized by “primary sediment enrichment - interlayer oxidation - superimposed transformation”. They claimed that their model would be helpful for formulating guidelines in the exploration for sandstone-type uranium deposits in the Songliao Basin, [although they ignored the work done on roll-front deposits in the U.S., e.g. Campbell (2020)].
The authors concluded that the salient characteristics of Qianjiadian uranium deposit have been completed and they proposed a metallogenic model. The main conclusions from their study are as follows.
1) Qianjiadian uranium deposit in the Songliao Basin is a product of typical interlayer oxidation mineralization of roll type.
2) The occurrence of reductive sand bodies of poor permeability in the Qianjiadian uranium reservoir determines the shape of uranium-rich orebodies at present.
3) The Qianjiadian uranium deposit is characterized by the multi-stage superposition metallogenic model of "sedimentary preconcentration - interlayer oxidation - groundwater, oil-gas and hydrothermal superimposition transformation".
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