Mineralogical and geochemical characteristics of the Sedemte Prestola potassic alkaline pluton

The Sedemte Prestola pluton is an intermediate to acid plutonic body of Variscan age (308.7 ± 9.1 Ma). Despite its small size, several petrographic varieties are present: syenites, quartzsyentes and granites. It composed potassium feldspar, quartz, sodic-calcic amphibole; biotite, when present, often rimmed by amphibole or strongly altered; zircon, titanite, apatite ilmenite the accessory phases. rocks display pronounced potassic character with up 10.4 wt% K2O, peralkaline tendency, significant trace element enrichment for REE, Zr, Th, U, Ba. also show enriched isotopic characteristic 87/86Sri between 0.7107 0.7111, 143/144Ndi 0.51193 0.51182. geochemical features imply orogenic geodynamic setting formation as a product more primitive magma fractionation. Isotopic characteristics high LILE, Th U contents support derivation from mantle source – phlogopite-bearing peridotites in spinel stability field.