Effects of change in slab geometry on the mantle flow and slab fabric in Southern Peru

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dc.contributor.authorAntonijevic, Sanja Knezevic
dc.contributor.authorWagner, Lara S.
dc.contributor.authorBeck, Susan L.
dc.contributor.authorLong, Maureen D.
dc.contributor.authorZandt, George
dc.contributor.authorTavera, Hernando
dc.date.accessioned2018-08-09T17:16:14Z
dc.date.available2018-08-09T17:16:14Z
dc.date.issued2016-10
dc.description.abstractThe effects of complex slab geometries on the surrounding mantle flow field are still poorly understood. Here we combine shear wave velocity structure with Rayleigh wave phase anisotropy to examine these effects in southern Peru, where the slab changes its geometry from steep to flat. To the south, where the slab subducts steeply, we find trench‐parallel anisotropy beneath the active volcanic arc that we attribute to the mantle wedge and/or upper portions of the subducting plate. Farther north, beneath the easternmost corner of the flat slab, we observe a pronounced low‐velocity anomaly. This anomaly is caused either by the presence of volatiles and/or flux melting that could result from southward directed, volatile‐rich subslab mantle flow or by increased temperature and/or decompression melting due to small‐scale vertical flow. We also find evidence for mantle flow through the tear north of the subducting Nazca Ridge. Finally, we observe anisotropy patterns associated with the fast velocity anomalies that reveal along strike variations in the slab's internal deformation. The change in slab geometry from steep to flat contorts the subducting plate south of the Nazca Ridge causing an alteration of the slab petrofabric. In contrast, the torn slab to the north still preserves the primary (fossilized) petrofabric first established shortly after plate formation.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationAntonijevic, S. K., Wagner, L. S., Beck, S. L., Long, M. D., Zandt, G., & Tavera, H. (2016). Effects of change in slab geometry on the mantle flow and slab fabric in Southern Peru.==$Journal of Geophysical Research: Solid Earth, 121$==(10), 7252-7270. https://doi.org/10.1002/2016JB013064es_ES
dc.identifier.doihttps://doi.org/10.1002/2016JB013064es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Solid Earthes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2354
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9313
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectStructural geologyes_ES
dc.subjectSubductiones_ES
dc.subjectMantlees_ES
dc.subjectTectonicses_ES
dc.subjectAnisotropyes_ES
dc.subjectElastic waveses_ES
dc.subjectEarth scienceses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.04es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.06es_ES
dc.titleEffects of change in slab geometry on the mantle flow and slab fabric in Southern Perues_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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