Multistage magmatic and metamorphic evolution in the Southern Siberian Craton: Archean and Palaeoproterozoic zircon ages revealed by SHRIMP and TIMS

Abstract

This U–Pb zircon geochronological study using TIMS and SHRIMP dating reveals new insights into the magmatic and metamorphic evolution of the Siberian Craton. Granulites, granites and one migmatite substantiate a multistage history. For the granulites an Archean protolith (3.4Ga) is documented, followed by a first granulite formation at 2.6Ga. In the Palaeoproterozoic a migmatisation event at 2.0Ga and two stages of granulitisation and granite emplacement at 1.88Ga and 1.85Ga are detected. The latter event (1.85Ga) is interpreted to mark the final consolidation of the Siberian Craton. Therefore this part of the craton was protected from younger overprints during the assembly of Rodinia in the Mesoproterozoic.