Sm-Nd- and Pb-Pb- isotope systems on the lower crust xenoliths in dykes and explosion piper on Southern Kola Peninsula

Consideration is given to results of studying Sm-Nd- and Pb-Pb-isotope systems in modules of ecologite-like rocks in explosion pipes and monchikite dykes on Southern Kola Perninsula. It is shown that basic granulites of late-Archean -early-Proterozoic age of crustal protolytes participate in formation of the lower crust of the Southern Kola Peninsula. Different age stages of formation of metamorphic paragenesis in the early Proterozoic are noted in xenoliths. Proterozoic process proceeded under conditions of open system with addition of substance of plunged old upper crust or enriched lithospherical manthle