Коллектив авторов - Строение и история развития литосферы

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Abstract

The first data on the temporal evolution of mantle source composition of magmas from associated structures of Polar Ocean (Spitsbergen island and Knipovich ridge) were obtained for last 20 m.y. on the base of chemical composition and 87Sr/ 86Sr and 143Nd/ 144Nd isotope ratios of rocks and major and trace elements concentrations in olivine phenocrysts. It is shown that the major source of Spitsbergen Neogene lavas was olivine free pyroxenite with elevated 87Sr/ 86Sr and reduced 143Nd/ 144Nd ratios which has been likely produced by reaction of recycled oceanic and lower continental crust with peridotite. Due to its high melt productivity, such a pyroxenite may act as a source of substantial amount of magma under thick continental lithosphere thus triggering its breakup. With decreasing age (Neogene-modern) the proportion of pyroxenite component of magmas gradually falls down due to increasing proportion of peridotite component with subsequent progression of composition of Sr and Nd isotopes toward depleted end-member. We explain this evolution by delimitation of continental lithosphere and subsequent decompression melting of peridotitic component.