Basic plutonic rocks have the following U contents (gabbro 0.90 ppm U, diorite 2.00 ppm U, granodiorite 2.60 ppm U, granite 4.00 ppm U). This differentiation favors the accumulation of U in aplitic and pegmatitic rocks but it is not the ensialic but the ensimatic part which is most prospective for U deposits. Granites, leucogranites, aplites, pegmatites, alaskites (alkaline granites) shows which way the geological setting becomes more favorable. Alkaline rocks (K or Na >>>Ca), syenites mostly enriched in Th. U travels with e.g. F complexes. Uranium is associated with intrusive igneous rocks alaskite , granite ,monzonites, alkaline granite and syenites, pegmatite (Bancroft , Canada) with refractory U minerals such as with high Th contents (davidite, uraninite, thorite, bedafite, eudyalite, pyrochlore in low-grade-large-tonnage deposits (Roessing , Valencia (Namibia), Goanikontes, Trekkopje (Namibia), Illimaussaq (Greenland).
HGD
I investigated granite pegmatites in the Uranium City area (Saskatchewan, Canada) where there are many, but consistently low grade. They can be developed, but it would be very expensive as compared to other much higher grade U deposits of that area.
The age dates of these pegmatites were much older than the higher grade U deposits leading to the conclusion that the erosion of U from pegmatites produced soluble U which moved downhill and formed the higher grade deposits.
Dear Gholamreza Fotoohi Rad ,
Dear Gholamreza Fotoohi Rad ,
You have gotten excellent answers from the previous posters.
Comparing your territory (Iran) with Transilvanian theritory... It can be said that you have rich uranium ores... That is why I propose you study the existing Uranium ore frome Baita Bihor...You can come on a trip in the field, personally, I will be happy to guide you.
Regards,
Laszlo
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