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dc.contributor.author
Calixto, Frank J.
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Sandvol, Eric
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Kay, Suzanne
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Mulcahy, Patrick
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Heit, Benjamin
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Yuan, Xiaohui
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Coira, Beatriz Lidia Luisa
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Comte, Diana
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Alvarado, Patricia Monica
dc.date.available
2017-09-29T14:45:04Z
dc.date.issued
2013-10
dc.identifier.citation
Calixto, Frank J.; Sandvol, Eric; Kay, Suzanne; Mulcahy, Patrick; Heit, Benjamin; et al.; Velocity structure beneath the southern Puna plateau: evidence for delamination; American Geophysical Union; Geochemistry Geophysics Geosystems; 14; 10; 10-2013; 4292-4305
dc.identifier.issn
1525-2027
dc.identifier.uri
http://hdl.handle.net/11336/25419
dc.description.abstract
The high elevation of the southern Puna plateau, the widespread melting of its crust, the gap in intermediate depth seismicity and the recent eruptions of ignimbrite complexes can be explained by delamination of the lithospheric mantle beneath it. To test this hypothesis, an array consisting of 73 broad band and short period seismic stations was deployed in the region for a period of 2 years starting in 2007. We inverted the data using the two plane wave approach and obtained 1-D and 3-D Rayleigh wave phase velocities. Our dispersion curve shows that at short periods (<70 s) the phase velocities are slightly higher than those of the Tibetan plateau and lower than those of the Anatolian plateau. At periods of 100–140 s we observe a low velocity zone that might be remnant hot asthenosphere below a flat slab (7–10 Ma). We estimate the average continental lithosphere thickness for the region to be between 100 and 130 km. Our three-dimensional Rayleigh wave phase velocities show a high velocity anomaly at low frequencies (0.007, 0.008, and 0.009 Hz) slightly to the north of Cerro Galan. This would be consistent with the hypothesis of delamination in which a piece of lithosphere has detached and caused upwelling of hot asthenosphere, which in turn caused widespread alkaline-collision related volcanism. This interpretation is also corroborated by our shear wave velocity model, where a high velocity anomaly beneath the northern edge of Cerro Galan at 130 km depth is interpreted as the delaminated block on top of the subducting Nazca slab.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Geophysical Union
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Velocity Structure Beneath
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Southern Puna Plateau
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Evidence for Delamination
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Oceanografía, Hidrología, Recursos Hídricos
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Velocity structure beneath the southern Puna plateau: evidence for delamination
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-28T18:12:56Z
dc.journal.volume
14
dc.journal.number
10
dc.journal.pagination
4292-4305
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington D. C.
dc.description.fil
Fil: Calixto, Frank J.. University of Missouri; Estados Unidos
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Fil: Sandvol, Eric. University of Missouri; Estados Unidos
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Fil: Kay, Suzanne. Cornell University; Estados Unidos
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Fil: Mulcahy, Patrick. Cornell University; Estados Unidos
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Fil: Heit, Benjamin. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
dc.description.fil
Fil: Yuan, Xiaohui. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
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Fil: Coira, Beatriz Lidia Luisa. Universidad Nacional de Jujuy. Instituto de Geología Minera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
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Fil: Comte, Diana. Universidad de Chile; Chile
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Fil: Alvarado, Patricia Monica. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Geofísica y Astronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Geochemistry Geophysics Geosystems
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20266/abstract
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/ggge.20266
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