Velocity structure beneath the southern Puna plateau: evidence for delamination

Autores
Calixto, Frank J.; Sandvol, Eric; Kay, Suzanne; Mulcahy, Patrick; Heit, Benjamin; Yuan, Xiaohui; Coira, Beatriz Lidia Luisa; Comte, Diana; Alvarado, Patricia Monica
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Calixto, Frank J.. University of Missouri; Estados Unidos
Fil: Sandvol, Eric. University of Missouri; Estados Unidos
Fil: Kay, Suzanne. Cornell University; Estados Unidos
Fil: Mulcahy, Patrick. Cornell University; Estados Unidos
Fil: Heit, Benjamin. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
Fil: Yuan, Xiaohui. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
Fil: Coira, Beatriz Lidia Luisa. Universidad Nacional de Jujuy. Instituto de Geología Minera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Comte, Diana. Universidad de Chile; Chile
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
Materia
Velocity Structure beneath
Southern Puna Plateau
Evidence for Delamination
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/25419
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/25419
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Velocity structure beneath the southern Puna plateau: evidence for delaminationCalixto, Frank J.Sandvol, EricKay, SuzanneMulcahy, PatrickHeit, BenjaminYuan, XiaohuiCoira, Beatriz Lidia LuisaComte, DianaAlvarado, Patricia MonicaVelocity Structure beneathSouthern Puna PlateauEvidence for Delaminationhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The 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.Fil: Calixto, Frank J.. University of Missouri; Estados UnidosFil: Sandvol, Eric. University of Missouri; Estados UnidosFil: Kay, Suzanne. Cornell University; Estados UnidosFil: Mulcahy, Patrick. Cornell University; Estados UnidosFil: Heit, Benjamin. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; AlemaniaFil: Yuan, Xiaohui. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; AlemaniaFil: Coira, Beatriz Lidia Luisa. Universidad Nacional de Jujuy. Instituto de Geología Minera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Comte, Diana. Universidad de Chile; ChileFil: 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; ArgentinaAmerican Geophysical Union2013-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/25419Calixto, 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; 4292-43051525-2027CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20266/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1002/ggge.20266info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:39:05Zoai:ri.conicet.gov.ar:11336/25419instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:39:05.949CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Velocity structure beneath the southern Puna plateau: evidence for delamination
title Velocity structure beneath the southern Puna plateau: evidence for delamination
spellingShingle Velocity structure beneath the southern Puna plateau: evidence for delamination
Calixto, Frank J.
Velocity Structure beneath
Southern Puna Plateau
Evidence for Delamination
title_short Velocity structure beneath the southern Puna plateau: evidence for delamination
title_full Velocity structure beneath the southern Puna plateau: evidence for delamination
title_fullStr Velocity structure beneath the southern Puna plateau: evidence for delamination
title_full_unstemmed Velocity structure beneath the southern Puna plateau: evidence for delamination
title_sort Velocity structure beneath the southern Puna plateau: evidence for delamination
dc.creator.none.fl_str_mv Calixto, Frank J.
Sandvol, Eric
Kay, Suzanne
Mulcahy, Patrick
Heit, Benjamin
Yuan, Xiaohui
Coira, Beatriz Lidia Luisa
Comte, Diana
Alvarado, Patricia Monica
author Calixto, Frank J.
author_facet Calixto, Frank J.
Sandvol, Eric
Kay, Suzanne
Mulcahy, Patrick
Heit, Benjamin
Yuan, Xiaohui
Coira, Beatriz Lidia Luisa
Comte, Diana
Alvarado, Patricia Monica
author_role author
author2 Sandvol, Eric
Kay, Suzanne
Mulcahy, Patrick
Heit, Benjamin
Yuan, Xiaohui
Coira, Beatriz Lidia Luisa
Comte, Diana
Alvarado, Patricia Monica
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Velocity Structure beneath
Southern Puna Plateau
Evidence for Delamination
topic Velocity Structure beneath
Southern Puna Plateau
Evidence for Delamination
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Calixto, Frank J.. University of Missouri; Estados Unidos
Fil: Sandvol, Eric. University of Missouri; Estados Unidos
Fil: Kay, Suzanne. Cornell University; Estados Unidos
Fil: Mulcahy, Patrick. Cornell University; Estados Unidos
Fil: Heit, Benjamin. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
Fil: Yuan, Xiaohui. Helmholtz-Centre Potsdam. Deutsches GeoForschungsZentrum; Alemania
Fil: Coira, Beatriz Lidia Luisa. Universidad Nacional de Jujuy. Instituto de Geología Minera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Comte, Diana. Universidad de Chile; Chile
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
description 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.
publishDate 2013
dc.date.none.fl_str_mv 2013-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/25419
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
1525-2027
CONICET Digital
CONICET
url http://hdl.handle.net/11336/25419
identifier_str_mv 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
1525-2027
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20266/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1002/ggge.20266
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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