Results of integrated dating of eclogites of the belomorian mobile belt

Abstract

Generalized overview of all points of view on the timing of eclogite metamorphism of Belomorian Mobile Belt (BMB) with critical analysis of underlying arguments was made. The author’s interpretation of the age of eclogite metamorphism within the BMB is based on a combination of independent isotope-geochemical dating methods: local U-Pb dating of heterogeneous zircons with magmatic cores and eclogite rims, Lu-Hf and Sm-Nd dating of rock-forming minerals of eclogite paragenesis (garnet and omphacite). All three methods independently determine the age of eclogitic metamorphism as Svecofennian, with the same value of about 1900 Ma.