FLUOROPHLOGOPITE FROM ALBITIZED GRANITES OF PRIMORSKY COMPLEX (WEST BAIKAL REGION)
Fluorophlogopite (F = 5.52-8.98 wt %) was found in albitizated subalkaline biotitic granites of the final stage of Primorsky complex (Zapadnoye Pribaikalye). Phlogopite occurs in paragenesis with magnetute, hematite, rutile and calcite. It is characterized by low Al2O3 (6.51-9.78 wt %), FeOtot (3.62-5.11 wt %) and high SiO2 (43.47-50.54) contents. It is suggested that the fluorophlogopite formation took place due to the relatively low water content in initial melt, relatively high F and CO2 contents, and essentially to the carbon dioxide composition of fluid separating from melt at the early stages of its crystallization.