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associated with the Martin Lake successor Basin in the Beaverlodge area and El Sherana
Basin in South Alligator River area. U mineralization at the basal Jatulian unconformity
may have formed from fluid originating from diagenetic processes in the overlying basal
quartzite and conglomerates of the lower Jatulian sequence similar to deposits in the South
Alligator River area. U mineralization in close association with the mafic dikes are similar
to those of volcanic-type associated with the Martin Lake mafic dikes in the Beaverlodge
area. Uranium mineralization disseminated in the metamorphosed conglomerate of the
quartzite and arkosite members could have originated from remobilization of pre-existing
uranium enrichments from the Sariolian rocks along fault zones (K. Kyser, pers. Comm.
2012).
The occurrence of early U mineralization associated with the Jatulian successor basin
could be a favorable indication for the presence of unconformity-related U mineralization
in the younger overlying late Mesoproterozoic basins in the Karelia region of Finland, as
the early U mineralization in the successor basin could be a potential source for detrital
uraninite in younger Mesoproterozoic basins, such as the Satakunta Basin (Fig. 5.4).
5.3.2. Uranium metallogeny in Paleoproterozoic basins in Guyana
The Roraima Basin was deposited in a large Paleoproterozoic foreland basin in
northern South America. The basin covers a large area in Brazil, Venezuela, Guyana,
Suriname, and Colombia (Fig. 5.6) and consists mostly of horizontal and gently dipping
fluvial sandstones (Santos al., 2003).
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