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dc.contributor.authorLynner, Colton
dc.contributor.authorAnderson, Megan L.
dc.contributor.authorPortner, Daniel Evan
dc.contributor.authorBeck, Susan
dc.contributor.authorGilbert, Hersh
dc.date.accessioned2017-08-24T22:34:56Z
dc.date.available2017-08-24T22:34:56Z
dc.date.issued2017-07-16
dc.identifier.citationMantle flow through a tear in the Nazca slab inferred from shear wave splitting 2017, 44 (13):6735 Geophysical Research Lettersen
dc.identifier.issn00948276
dc.identifier.doi10.1002/2017GL074312
dc.identifier.urihttp://hdl.handle.net/10150/625357
dc.description.abstractA tear in the subducting Nazca slab is located between the end of the Pampean flat slab and normally subducting oceanic lithosphere. Tomographic studies suggest mantle material flows through this opening. The best way to probe this hypothesis is through observations of seismic anisotropy, such as shear wave splitting. We examine patterns of shear wave splitting using data from two seismic deployments in Argentina that lay updip of the slab tear. We observe a simple pattern of plate-motion-parallel fast splitting directions, indicative of plate-motion-parallel mantle flow, beneath the majority of the stations. Our observed splitting contrasts previous observations to the north and south of the flat slab region. Since plate-motion-parallel splitting occurs only coincidentally with the slab tear, we propose mantle material flows through the opening resulting in Nazca plate-motion-parallel flow in both the subslab mantle and mantle wedge.
dc.description.sponsorshipNSF [EAR-0738935, EAR-0739001, EAR-1565475]; Colorado College Patricia Buster Scholarship Fund; National Science Foundation through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation [EAR-1261681]en
dc.language.isoenen
dc.publisherAMER GEOPHYSICAL UNIONen
dc.relation.urlhttp://doi.wiley.com/10.1002/2017GL074312en
dc.rights© 2017. American Geophysical Union. All Rights Reserved.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectshear wave splittingen
dc.subjectflat slaben
dc.subjectslab tearen
dc.subjectmantle dynamicsen
dc.titleMantle flow through a tear in the Nazca slab inferred from shear wave splittingen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Geoscien
dc.identifier.journalGeophysical Research Lettersen
dc.description.note6 month embargo; published online: 13 July 2017en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
dc.contributor.institutionDepartment of Geosciences; University of Arizona; Tucson Arizona USA
dc.contributor.institutionDepartment of Geology; Colorado College; Colorado Springs Colorado USA
dc.contributor.institutionDepartment of Geosciences; University of Arizona; Tucson Arizona USA
dc.contributor.institutionDepartment of Geosciences; University of Arizona; Tucson Arizona USA
dc.contributor.institutionDepartment of Geoscience; University of Calgary; Calgary Alberta Canada
refterms.dateFOA2018-01-14T00:00:00Z
html.description.abstractA tear in the subducting Nazca slab is located between the end of the Pampean flat slab and normally subducting oceanic lithosphere. Tomographic studies suggest mantle material flows through this opening. The best way to probe this hypothesis is through observations of seismic anisotropy, such as shear wave splitting. We examine patterns of shear wave splitting using data from two seismic deployments in Argentina that lay updip of the slab tear. We observe a simple pattern of plate-motion-parallel fast splitting directions, indicative of plate-motion-parallel mantle flow, beneath the majority of the stations. Our observed splitting contrasts previous observations to the north and south of the flat slab region. Since plate-motion-parallel splitting occurs only coincidentally with the slab tear, we propose mantle material flows through the opening resulting in Nazca plate-motion-parallel flow in both the subslab mantle and mantle wedge.


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