The role of ridges in the formation and longevity of flat slabs

Simple item page
dc.contributor.authorAntonijevic, Sanja Knezevic
dc.contributor.authorWagner, Lara S.
dc.contributor.authorKumar, Abhash
dc.contributor.authorBeck, Susan L.
dc.contributor.authorLong, Maureen D.
dc.contributor.authorZandt, George
dc.contributor.authorTavera, Hernando
dc.contributor.authorCondori Quispe, Cristobal
dc.date.accessioned2018-09-10T20:12:15Z
dc.date.available2018-09-10T20:12:15Z
dc.date.issued2015-08
dc.description.abstractFlat-slab subduction occurs when the descending plate becomes horizontal at some depth before resuming its descent into the mantle. It is often proposed as a mechanism for the uplifting of deep crustal rocks (‘thick-skinned’ deformation) far from plate boundaries, and for causing unusual patterns of volcanism, as far back as the Proterozoic eon1. For example, the formation of the expansive Rocky Mountains and the subsequent voluminous volcanism across much of the western USA has been attributed to a broad region of flat-slab subduction beneath North America that occurred during the Laramide orogeny (80–55 million years ago)2. Here we study the largest modern flat slab, located in Peru, to better understand the processes controlling the formation and extent of flat slabs. We present new data that indicate that the subducting Nazca Ridge is necessary for the development and continued support of the horizontal plate at a depth of about 90 kilometres. By combining constraints from Rayleigh wave phase velocities with improved earthquake locations, we find that the flat slab is shallowest along the ridge, while to the northwest of the ridge, the slab is sagging, tearing, and re-initiating normal subduction. On the basis of our observations, we propose a conceptual model for the temporal evolution of the Peruvian flat slab in which the flat slab forms because of the combined effects of trench retreat along the Peruvian plate boundary, suction, and ridge subduction. We find that while the ridge is necessary but not sufficient for the formation of the flat slab, its removal is sufficient for the flat slab to fail. This provides new constraints on our understanding of the processes controlling the beginning and end of the Laramide orogeny and other putative episodes of flat-slab subduction.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationAntonijevic, S., Wagner, L., Kumar, A., Beck, S., Long, M., Zandt, G., ... Condori, C. (2015). The role of ridges in the formation and longevity of flat slabs.==$Nature, 524,$==212-215. https://doi.org/10.1038/nature14648es_ES
dc.identifier.doihttps://doi.org/10.1038/nature14648es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalNaturees_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2902
dc.language.isoenges_ES
dc.publisherNature Researches_ES
dc.relation.ispartofurn:issn:0028-0836
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectGeodynamicses_ES
dc.subjectGeophysicses_ES
dc.subjectSeismologyes_ES
dc.subjectTectonicses_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.titleThe role of ridges in the formation and longevity of flat slabses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
antonijevic2015.pdf
Size:
15.39 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Artículos Científicos