Abstract
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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
