Are there relict crustal fragments beneath the Moho

摘要: [1] The application of new data enhancement techniques on a Lithoprobe seismic reflection profile in northwest Canada has produced images upper mantle structures that are overlain with angular discordance by the Moho and underlain relict Mesoproterozoic subduction zone. The is interpreted to postdate underlying fabric may thus have been superimposed it thermal and/or structural processes. Reflections within subparallel east dipping zone as formed during, perhaps consequence of, subduction. Interpretation lithology layering uncertain, peridotites, eclogites, mafic granulites, pelitic restites can velocities densities appropriate for (or portion it). Nevertheless, if some layers beneath were originally crust, they retain memory.