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Upper-mantle low-velocity zone structure beneath the Kaapvaal craton from S-wave receiver functions

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dc.contributor.authorHansen, Samantha E.
dc.contributor.authorNyblade, Andrew A.
dc.contributor.authorJulia, Jordi
dc.contributor.authorDirks, Paul H. G. M.
dc.contributor.authorDurrheim, Raymond J.
dc.contributor.otherPennsylvania Commonwealth System of Higher Education (PCSHE)
dc.contributor.otherPennsylvania State University
dc.contributor.otherPennsylvania State University - University Park
dc.contributor.otherUniversity of Witwatersrand
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.coverage.spatialAfrica, Southern
dc.date.accessioned2018-10-19T18:24:01Z
dc.date.available2018-10-19T18:24:01Z
dc.date.issued2009
dc.description.abstractP>The southern African Plateau is marked by anomalously high elevations, reaching 1-2 km above sea level, and there is much debate as to whether this topography is compensated by a lower mantle source or by elevated temperatures in the upper mantle. In this study, we use S-wave receiver functions (SRFs) to estimate the lithospheric thickness and sublithospheric mantle velocity structure beneath the Kaapvaal craton, which forms the core of the Plateau. To fit the SRF data, a low-velocity zone (LVZ) is required below a similar to 160-km-thick lithospheric lid, but the LVZ is no thicker than similar to 90 km. Although the lid thickness obtained is thinner than that reported in previous SRF studies, neither the lid thickness nor the shear velocity decrease (similar to 4.5%) associated with the LVZ is anomalous compared to other cratonic environments. Therefore, we conclude that elevated temperatures in the sublithospheric upper mantle contribute little support to the high elevations in this region of southern Africa.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationHansen, S., et al. (2009): Upper-Mantle Low-Velocity Zone Structure beneath the Kaapvaal Craton from S-Wave Receiver Functions. Geophysical Journal International, 178(2). DOI: https://doi.org/10.1111/j.1365-246X.2009.04178.x
dc.identifier.doi10.1111/j.1365-246X.2009.04178.x
dc.identifier.orcidhttps://orcid.org/0000-0002-9232-0938
dc.identifier.orcidhttps://orcid.org/0000-0001-7608-5715
dc.identifier.orcidhttps://orcid.org/0000-0003-3832-0600
dc.identifier.urihttp://ir.ua.edu/handle/123456789/4061
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.rights.licenseAttribution-NonCommercial 4.0 International (CC BY-NC 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.subjectSeismicity and tectonics
dc.subjectCratons
dc.subjectAfrica
dc.subjectCRUSTAL STRUCTURE
dc.subjectSOUTHERN AFRICA
dc.subjectDEEP-STRUCTURE
dc.subjectLITHOSPHERE
dc.subjectEARTH
dc.subjectCONSTRAINTS
dc.subjectEVOLUTION
dc.subjectFLOW
dc.subjectGeochemistry & Geophysics
dc.titleUpper-mantle low-velocity zone structure beneath the Kaapvaal craton from S-wave receiver functionsen_US
dc.typetext
dc.typeArticle

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