AGE AND εND CONSTRAINTS ON THE PALAEOPROTEROZOIC TECTONIC EVOLUTION IN THE BALTIC-SEA REGION

Abstract

The metamorphic Precambrian basement in the western part of the East European Craton (EEC) has previously been considered to be Archaean in age. Recent U–Pb and Sm–Nd studies in Estonia, Poland and Belarus have, however, revealed a vast area of Palaeoproterozoic crust. In order to survey the crustal ages in Latvia and Lithuania, and to establish the relationships of these territories with adjacent regions of the EEC, particularly those exposed in the Baltic and Ukrainian Shields, three new U–Pb zircon age determinations and 21 ϵNd whole-rock analyses were performed.