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Subduction system and flat slab beneath the Eastern Cordillera of Colombia

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dc.creatorChiarabba, Claudiospa
dc.creatorDe Gori, Pasqualespa
dc.creatorFaccenna, Claudiospa
dc.creatorSperanza, Fabiospa
dc.creatorSeccia ,Danilospa
dc.creatorDionicio,Vivianaspa
dc.creatorPrieto, Germán A.spa
dc.date.accessioned2020-08-06T16:20:27Z
dc.date.available2020-08-06T16:20:27Z
dc.date.created2015-11-26spa
dc.description.abstractSeismicity at the northern terminus of the Nazca subduction is diffused over a wide area containing the puzzling seismic feature known as the Bucaramanga nest. We relocate about 5000 earthquakes recorded by the Colombian national seismic network and produce the first 3?D velocity model of the area to define the geometry of the lithosphere subducting below the Colombian Andes. We found lateral velocity heterogeneities and an abrupt offset of the Wadati?Benioff zone at 5°N indicating that the Nazca plate is segmented by an E?W slab tear, that separates a steeper Nazca segment to the south from a flat subduction to the north. The flat Nazca slab extends eastward for about 400 km, before dip increases to ?50° beneath the Eastern Cordillera, where it yields the Bucaramanga nest. We explain this puzzling locus of intermediate?depth seismicity located beneath the Eastern Cordillera of Colombia as due to a massive dehydration and eclogitization of a thickened oceanic crust. We relate the flat subducting geometry to the entrance at the trench at ca. 10 Ma of a thick ? buoyant oceanic crust, likely a volcanic ridge, producing a high coupling with the overriding plate. Sub?horizontal plate subduction is consistent with the abrupt disappearance of volcanism in the Andes of South America at latitudes?>?5°N.eng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1002/2015GC006048
dc.identifier.issnISSN: 1525-2027
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/26015
dc.language.isoengspa
dc.publisherJohn Wiley and Sonsspa
dc.relation.citationEndPage27
dc.relation.citationIssueNo. 1
dc.relation.citationStartPage16
dc.relation.citationTitleGeochemistry Geophysics Geosystems
dc.relation.citationVolumeVol. 17
dc.relation.ispartofGeochemistry Geophysics Geosystems, ISSN: 1525-2027, Vol.17, No.1 (January, 2016); pp.16-27spa
dc.relation.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015GC006048spa
dc.rights.accesRightsinfo:eu-repo/semantics/openAccess
dc.rights.accesoAbierto (Texto Completo)spa
dc.sourceGeochemistry Geophysics Geosystemsspa
dc.source.instnameinstname:Universidad del Rosario
dc.source.reponamereponame:Repositorio Institucional EdocUR
dc.subject.keywordSeismic tomographyspa
dc.subject.keywordColombian Andesspa
dc.subject.keywordSubductionspa
dc.titleSubduction system and flat slab beneath the Eastern Cordillera of Colombiaspa
dc.title.TranslatedTitleSistema de subducción y losa plana debajo de la Cordillera Oriental de Colombiaspa
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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