PUBLICATIONS Geophysical Research Letters RESEARCH LETTER Evidence for slab material under Greenland 10.1002/2016GL068424 and links to Cretaceous High Key Points: Arctic magmatism • Mid-mantle seismic and gravity anomaly under Greenland identified G. E. Shephard1, R. G. Trønnes1,2, W. Spakman1,3, I. Panet4, and C. Gaina1 • Jurassic-Cretaceous slab linked to paleo-Arctic ocean closure, prior to 1Centre for Earth Evolution and Dynamics (CEED), Department of Geosciences, University of Oslo, Oslo, Norway, 2Natural Amerasia Basin opening 3 • Possible arc-mantle signature in History Museum, University of Oslo, Oslo, Norway, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands, 4 Cretaceous High Arctic LIP volcanism Institut National de l’Information Géographique et Forestière, Laboratoire LAREG, Université Paris Diderot, Paris, France Supporting Information: Abstract Understanding the evolution of extinct ocean basins through time and space demands the • Supporting Information S1 integration of surface kinematics and mantle dynamics. We explore the existence, origin, and implications Correspondence to: of a proposed oceanic slab burial ground under Greenland through a comparison of seismic tomography, G. E. Shephard, slab sinking rates, regional plate reconstructions, and satellite-derived gravity gradients. Our preferred
[email protected] interpretation stipulates that anomalous, fast seismic velocities at 1000–1600 km depth imaged in independent global tomographic models, coupled with gravity gradient perturbations, represent paleo-Arctic oceanic slabs Citation: that subducted in the Mesozoic. We suggest a novel connection between slab-related arc mantle and Shephard, G. E., R. G. Trønnes, geochemical signatures in some of the tholeiitic and mildly alkaline magmas of the Cretaceous High Arctic W.