Upper mantle seismic structure beneath central East Antarctica from body wave tomography: Implications for the origin of the Gamburtsev Subglacial Mountains

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dc.contributor.authorLloyd, Andrew J.
dc.contributor.authorNyblade, Andrew A.
dc.contributor.authorWiens, Douglas A.
dc.contributor.authorShore, Patrick J.
dc.contributor.authorHansen, Samantha E.
dc.contributor.authorKanao, Masaki
dc.contributor.authorZhao, Dapeng
dc.contributor.otherPennsylvania Commonwealth System of Higher Education (PCSHE)
dc.contributor.otherPennsylvania State University
dc.contributor.otherPennsylvania State University - University Park
dc.contributor.otherWashington University (WUSTL)
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherResearch Organization of Information & Systems (ROIS)
dc.contributor.otherNational Institute of Polar Research (NIPR) - Japan
dc.contributor.otherTohoku University
dc.coverage.spatialAntarctica
dc.date.accessioned2018-10-19T18:56:59Z
dc.date.available2018-10-19T18:56:59Z
dc.date.issued2013-04-17
dc.description.abstractThe Gamburtsev Subglacial Mountains (GSM), located near the center of East Antarctica, are the highest feature within the East Antarctic highlands and have been investigated seismically for the first time during the 2007/2008 International Polar Year by the Gamburtsev Mountains Seismic Experiment. Using data from a network of 26 broadband seismic stations and body wave tomography, the P and S wave velocity structure of the upper mantle beneath the GSM and adjacent regions has been examined. Tomographic images produced from teleseismic P and S phases reveal several large-scale, small amplitude anomalies (Vp=1.0%, Vs=2.0%) in the upper 250 km of the mantle. The lateral distributions of these large-scale anomalies are similar in both the P and S wave velocity models and resolution tests show that they are well resolved. Velocity anomalies indicate slower, thinner lithosphere beneath the likely Meso- or Neoproterozoic Polar Subglacial Basin and faster, thicker lithosphere beneath the likely Archean/Paleoproterozoic East Antarctic highlands. Within the region of faster, thicker lithosphere, a lower amplitude (Vp=0.5%, Vs=1.0%) slow to fast velocity pattern is observed beneath the western flank of the GSM, suggesting a suture between two lithospheric blocks possibly of similar age. These findings point to a Precambrian origin for the high topography of the GSM, corroborating other studies invoking a long-lived highland landscape in central East Antarctica, as opposed to uplift caused by Permian/Cretaceous rifting or Cenozoic magmatism. The longevity of the GSM makes them geologically unusual; however, plausible analogs exist, such as the 550 Ma Petermann Ranges in central Australia. Additional uplift may have occurred by the reactivation of pre-existing faults, for example, during the Carboniferous-Permian collision of Gondwana and Laurussia.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationLloyd, A., et al. (2013): Upper Mantle Seismic Structure beneath Central East Antarctica from Body Wave Tomography: Implications for the Origin of the Gamburtsev Subglacial Mountains. Geochemistry, Geophysics, Geosystems, 14(4). DOI: https://doi.org/10.1002/ggge.20098
dc.identifier.doi10.1002/ggge.20098
dc.identifier.orcidhttps://orcid.org/0000-0002-5169-4386
dc.identifier.orcidhttps://orcid.org/0000-0001-7608-5715
dc.identifier.orcidhttps://orcid.org/0000-0002-2253-1342
dc.identifier.orcidhttps://orcid.org/0000-0003-2096-5195
dc.identifier.urihttp://ir.ua.edu/handle/123456789/4063
dc.languageEnglish
dc.language.isoen_US
dc.publisherAmerican Geophysical Union
dc.subjectEast Antarctica
dc.subjectGamburtsev Subglacial Mountains
dc.subjectupper mantle
dc.subjectVELOCITY STRUCTURE BENEATH
dc.subjectPRINCE-CHARLES MOUNTAINS
dc.subjectTRANSANTARCTIC MOUNTAINS
dc.subjectPRYDZ BAY
dc.subjectROSS SEA
dc.subjectLANDSCAPE EVOLUTION
dc.subjectBASEMENT PROVINCES
dc.subjectLARSEMANN-HILLS
dc.subjectLAMBERT GRABEN
dc.subjectARRIVAL TIMES
dc.subjectGeochemistry & Geophysics
dc.titleUpper mantle seismic structure beneath central East Antarctica from body wave tomography: Implications for the origin of the Gamburtsev Subglacial Mountainsen_US
dc.typetext
dc.typeArticle

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