Mineralogical study of Sibolga granite as an uranium source

Mineralogical study of Sibolga granite as an uranium source. Exploration for uranium mineralization associated with granite is frequently based on the concept of genetic models of granite. S type granite commonly are uranium carrier, it is genetically ascribed to crustal anatexis of sediment because of compression in the geosyncline or in the continental arc. The granite is characterized by relatively low Na2O, with high of Al23, SiO2 and K2O. The accessory minerals are biotite, garnet, muskovite, and ilmenite. Sibolga granite partially is an alkaline granite relatively high in SiO2, Al2O3 and it contains biotite, monazite, zircon, fluorite, apatite, ilmenite, magnetite, pyrite, and small amounts of muscovite. Uranium content in the granite is relatively high, it is found in uraninite, pyrochlore, and other accessory minerals. Uranium in the granite is recognized partially as leachable uranium, which is distinctive for uranium source granite. (author). 8 figs.; 9 refs