The Jamon granite is representative of the Lower Proterozoic (1.88 Ga) oxidized A-type granites of the eastern part of the Amazonian craton. The dominant facies is a metaluminous to slightly peraluminous hornblende biotite monzogranite with K2O/Na2O between 0.8 and 1.5 and FeOt/(FeOt + MgO) between ...
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