Partial Melting Features in Mantle Xenoliths of Spinel Lherzolites of Zhokhov Island, De-Long Archipelago, Eastern Arctic

Zhokhov Island beongs to the De-Long Archipelago located in the Eastern sector of the Russian continental shelf within the Arctic Basin. The Island is a young volcanic center and is composed of lava flowsalkaline olivine-porphyry basalts and subordanate limburgites. The study was aimed at identifying possible regional and geodynamic factors influencing the specifics of the partial melting process and mineral transformations in mantle xenoliths of Zhokhov Island. Five xenoliths selected from samples of alkali basalts on Zhokhov Island were studied using a scanning electron microscope. The data obtained allowed us to conclude that the formation of high-sodium glasses in the mantle xenoliths of Zhokhov Island is associated with the interaction between Spinel Lherzolites and parental for host Olivine Basalts magmatic melt. At the same time, high-potassium glasses inside mantle xenoliths were formed in situ during the melting of a primary potassium-containing pgase which may have been Phlogopite. The formation of two distinct contrasting in composition zones of recrystallization in contact between mantle xenoliths and host basalt is due to the evolution of composition of the alkaline silicate melt carried xenoliths. Signs of activation of young intraplate magmatism facilitating the transport of fragments of metasomatized shallow mantle are established in a large area of the Arctic Basin.