Nam Giai granite formative thermody - namics and biomass based on Biotite

Abstract

The biotite found in the Nam Giai massif of Que Phong District, Nghe An Province, belongs to the an[1]nite-siderophyllite series and exhibits high iron (Fe) and magnesium (Mg) content. Based on the biotite composition, it can be inferred that the massif was formed at temperatures ranging from 667 to 724°C and an average pressure of 1.58 ± 0.68 kbar, corresponding to a depth of approximately 5 km, within the mesoabys[1]sal facies. The volatile substance parameters indicate that the massif was formed in a reducing environment, aligning with the granitoid I-SCR and belonging to the S-granite type. The biotite in the massif is chlorine-rich and fluorine-poor, indicating a metallogenic specializa[1]tion corresponding to Cl-granite. This suggests that the formation of the massif involved magma heavily con[1]taminated with crustal components. Based on these pa[1]rameters, the granitoid of the massif exhibits potential mineralization of molybdenum (Mo) and copper-mo[1]lybdenum (Cu-Mo).