Foreland uplift during flat subduction: insights from the Peruvian Andes and Fitzcarrald Arch

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dc.contributor.authorBishop, Brandon T.
dc.contributor.authorBeck, Susan L.
dc.contributor.authorZandt, George
dc.contributor.authorWagner, Lara S.
dc.contributor.authorLong, Maureen D.
dc.contributor.authorTavera, Hernando
dc.coverage.spatialAndes
dc.date.accessioned2018-08-07T14:10:04Z
dc.date.available2018-08-07T14:10:04Z
dc.date.issued2018-04-22
dc.description.abstractForeland deformation has long been associated with flat-slab subduction, but the precise mechanism linking these two processes remains unclear. One example of foreland deformation corresponding in space and time to flat subduction is the Fitzcarrald Arch, a broad NE-SW trending topographically high feature covering an area of >4 × 10⁵ km² in the Peruvian Andean foreland. Recent imaging of the southern segment of Peruvian flat slab shows that the shallowest part of the slab, which corresponds to the subducted Nazca Ridge northeast of the present intersection of the ridge and the Peruvian trench, extends up to and partly under the southwestern edge of the arch. Here, we evaluate models for the formation of this foreland arch and find that a basal-shear model is most consistent with observations. We calculate that ~5 km of lower crustal thickening would be sufficient to generate the arch's uplift since the late Miocene. This magnitude is consistent with prior observations of unusually thickened crust in the Andes immediately south of the subducted ridge that may also have been induced by flat subduction. This suggests that the Fitzcarrald Arch's formation by the Nazca Ridge may be one of the clearest examples of upper plate deformation induced through basal shear observed in a flat-slab subduction setting. We then explore the more general implications of our results for understanding deformation above flat slabs in the geologic past.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationBishop, B., Beck, S., Zandt, G., Wagner, L., Long, M., & Tavera, H. (2018). Foreland uplift during flat subduction: insights from the Peruvian Andes and Fitzcarrald Arch.==$Tectonophysics, 731–732,$==73-84. https://doi.org/10.1016/j.tecto.2018.03.005es_ES
dc.identifier.doihttps://doi.org/10.1016/j.tecto.2018.03.005es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalTectonophysicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2291
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0040-1951
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectStructural geologyes_ES
dc.subjectDeformationes_ES
dc.subjectMantlees_ES
dc.subjectLithospherees_ES
dc.subjectSubductiones_ES
dc.subjectTectonicses_ES
dc.subjectTectonic platees_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.titleForeland uplift during flat subduction: insights from the Peruvian Andes and Fitzcarrald Arches_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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