Isotope Composition and Magma Sources of the Kresty Volcanopluton in Polar Siberia

摘要

The first data arc presented on the distribution of rare elements and isotope composition of neody-mium and strontium in the rocks of the alkaline-ultramafitie association of the Kresty volcanoplutonic structure (one of the probable satellites of the Gulinian massif being the largest in the Maimecha-Kotui alkaline province in Polar Siberia). On the basis of the results of geochemical studies performed and formerly obtained geophysical and isotope data, a new model is proposed for the plume nature of magmatism in the region, based on the action of a single mantle source of the PREMA type and its active interaction with the matter of the Earth's crust.