Tectono-magmatic evolution of the Greenland−Iceland−Norway ridge complex and the Jan Mayen hotspot in the Arctic Atlantic Ocean: Constraints from in situ trace elements and Sr isotopes of minerals

The subarctic North Atlantic Ocean has experienced a complex and gradual magmatic evolution, including continental breakup, mature seafloor spreading, episodic ridge jumps. Here, we present new in situ major-element, trace-element, Sr isotopic compositions for minerals (olivine, clinopyroxene, plagioclase) from the Jan Mayen microcontinent (Integrated Drilling Program [IODP] Sites 907 985), Reykjanes Ridge (Site 983), Greenland Basin 913), Knipovich 911) volcanic samples Arctic Ocean. hotspot−type Iceland plume−type rocks have common magma source. former were likely derived latter by further fractional crystallization, resulting their distinct geochemical features. incompatible element show that normal mid-ocean-ridge basalt spreading feature older (>14 Ma) system enriched plume younger (1.521 Ma 1.049 indicate plume-ridge interaction evolution mid-ocean-ridge−type to plume-type magmatism beneath Norwegian−Greenland Sea. disequilibrium of isotopes plagioclase among groundmass, phenocryst cores, rims is due heterogeneous basin, with contamination thick crust influence H2O-enriched melts originating deep plume.