ARCHEAN CHARNOCKITE−ENDERBITE COMPLEX IN BELOMORIE: ORIGIN AND MELT GENERATION PARAMETERS

Abstract

The protolith is reproduced and the parameters of enderbite melt generation are calculated for of the Pon'goma Navolok charnockite−enderbite massif (the best preserved massif of the type in Belomorie). The enderbite melt was derived at P = 12.8−15.8 kbar and T = 1030−1080 o C from an amphibolite protolith under the effect of saline H 2 O−CO 2 mantle fluid. The Archean granulite-facies metamorphism of the rocks of the Belomorian Mobile Belt was controlled by heat flux from the charnockite massifs and was thus of contact nature.