Zhang and three co-authors reported in 2020 that the Qianjiadian uranium deposit is located in the southwest margin of Songliao basin. Electron probe, energy spectrum, back scattering analysis, scanning electron microscopy and other experimental methods are used to study uranium occurrence form and uranium mineral type in Qiandaidian uranium deposit.
The results are shown as follows:
(1) The occurrence forms of uranium in Qiandaidian uranium mining area include uranium minerals, adsorption uranium. The uranium in low-grade ore is mainly in the form of dispersive adsorption, which is clay mineral and organic matter adsorption. The high-grade ore mainly exists in the form of uranium mineral, the type of uranium mineral is mainly pitchblende, followed by coffinite, a small amount of uranium mineral containing titanium.
(2) Uranium minerals are often closely symbiotic with pyrite, carbonate and so on, most of them develop in the pyrite,
carbonate margin and fractures in the form of colloidal, there are also granular, pellet independent distribution.
(3) Uranium minerals are rich in Phosphorus, and there is an obvious positive correlation between Phosphorus and Silicon. It has been found that some samples contain phosphorus-rich uranium aggregates in microspheres, which is considered as a strong evidence that microorganisms are involved in uranium mineralization at low temperature.
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