Evidence for slab material under Greenland and links to Cretaceous High Arctic magmatism

摘要: Understanding the evolution of extinct ocean basins through time and space demands integration surface kinematics mantle dynamics. We explore existence, origin, implications a proposed oceanic slab burial ground under Greenland comparison seismic tomography, sinking rates, regional plate reconstructions, satellite-derived gravity gradients. Our preferred interpretation stipulates that anomalous, fast velocities at 1000-1600 km depth imaged in independent global tomographic models, coupled with gradient perturbations, represent paleo-Arctic slabs subducted Mesozoic. suggest novel connection between slab-related arc geochemical signatures some tholeiitic mildly alkaline magmas Cretaceous High Arctic Large Igneous Province Sverdrup Basin. However, continental crustal contributions are noted these evolved basaltic rocks. The independent, yet complementary, data sets provides insight into present-day structure, magmatic events, relict oceans.