Geophysical-petrological modelling of the East Greenland Caledonides - Isostatic support from crust and upper mantle

摘要

Teleseismic receiver function analysis imaged a complex upper mantle structure in.the Central Fjord Region of East Greenland, including an east-dipping high velocity layer and a mantle wedge of high crustal or low mantle velocities. This was interpreted as a fossil Caledonian subduction complex, including a slab of eclogitised mafic ' crust and an overlying wedge of serpentinised mantle. In this paper, we use a multi-disciplinary geophysical and petrological modelling approach to test this proposed fossil subduction model.