Causes and consequences of flat-slab subduction in southern Peru

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dc.contributor.authorBishop, Brandon T.
dc.contributor.authorBeck, Susan L.
dc.contributor.authorZandt, George
dc.contributor.authorWagner, Lara
dc.contributor.authorLong, Maureen
dc.contributor.authorKnezevic Antonijevic, Sanja
dc.contributor.authorKumar, Abhash
dc.contributor.authorTavera, Hernando
dc.coverage.spatialPerú
dc.date.accessioned2018-08-06T14:35:39Z
dc.date.available2018-08-06T14:35:39Z
dc.date.issued2017-07-27
dc.description.abstractFlat or near-horizontal subduction of oceanic lithosphere has been an important tectonic process both currently and in the geologic past. Subduction of the aseismic Nazca Ridge beneath South America has been associated with the onset of flat subduction and the termination of arc volcanism in Peru, making it an ideal place to study flat-slab subduction. Recently acquired seismic recordings for 144 broadband seismic stations in Peru permit us to image the Mohorovicic discontinuity (Moho) of the subducted oceanic Nazca plate, Nazca Ridge, and the overlying continental Moho of the South American crust in detail through the calculation of receiver functions. We find that the subducted over-thickened ridge crust is likely significantly eclogitized ~350 km from the trench, requiring that the inboard continuation of the flat slab be supported by mechanisms other than low-density crustal material. This continuation coincides with a low-velocity anomaly identified in prior tomography studies of the region immediately below the flat slab, and this anomaly may provide some support for the flat slab. The subduction of the Nazca Ridge has displaced most, if not the entire South American lithospheric mantle beneath the high Andes as well as up to 10 km of the lowermost continental crust. The lack of deep upper-plate seismicity suggests that the Andean crust has remained warm during flat subduction and is deforming ductilely around the subducted ridge. This deformation shows significant coupling between the subducting Nazca oceanic plate and overriding South American continental plate up to ~500 km from the trench. These results provide important modern constraints for interpreting the geological consequences of past and present flat-slab subduction locations globally.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationBishop, B. T., Beck, S. L., Zandt, G., Wagner, L., Long, M., Knezevic, S., ... Tavera, H. (2017). Causes and consequences of flat-slab subduction in southern Peru.==$Geosphere, 13$==(5), 1392-1407. https://doi.org/10.1130/GES01440.1es_ES
dc.identifier.doihttps://doi.org/10.1130/GES01440.1es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalGeospherees_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2257
dc.language.isoenges_ES
dc.publisherGeological Society of Americaes_ES
dc.relation.ispartofurn:issn:1553-040X
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectSubductiones_ES
dc.subjectLithospherees_ES
dc.subjectSeismic stationes_ES
dc.subjectOceanic crustes_ES
dc.subjectSeismicityes_ES
dc.subjectGeological faultses_ES
dc.subjectSeismologyes_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.titleCauses and consequences of flat-slab subduction in southern Perues_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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