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Cook & Vasudevan 2003
Cook, F.A. and Vasudevan, K. (2003). Are there relict crustal fragments beneath the Moho?. Tectonics 22: doi: 10.1029/2001TC001341. issn: 0278-7407.

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

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Abstract

Keywords
Seismology, Lithosphere and upper mantle, Exploration Geophysics, Seismic methods, Seismology, Continental crust
Journal
Tectonics
Publisher
American Geophysical Union
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