Shear wave splitting and shear wave splitting tomography of the southern Puna plateau

Autores
Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; Fischer, Karen; Heit, Ben; Yuan, Xiaohui; Comte, Diana; Alvarado, Patricia Monica
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.
Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados Unidos
Fil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados Unidos
Fil: Abt, David. ExxonMobil Exploration Company; Estados Unidos
Fil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados Unidos
Fil: Heit, Ben. GeoForschungsZentrum Potsdam; Alemania
Fil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; Chile
Fil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; 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. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
Materia
Seismic Anisotropy
Seismic Tomography
Continental Margins
Subduction Zone
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/5004

id CONICETDig_0d19c5133665eca77dc2a4569bee7a76
oai_identifier_str oai:ri.conicet.gov.ar:11336/5004
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Shear wave splitting and shear wave splitting tomography of the southern Puna plateauCalixto, Frank J.Robinson, DanielleSandvol, EricKay, SuzanneAbt, DavidFischer, KarenHeit, BenYuan, XiaohuiComte, DianaAlvarado, Patricia MonicaSeismic AnisotropySeismic TomographyContinental MarginsSubduction Zonehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados UnidosFil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados UnidosFil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados UnidosFil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados UnidosFil: Abt, David. ExxonMobil Exploration Company; Estados UnidosFil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados UnidosFil: Heit, Ben. GeoForschungsZentrum Potsdam; AlemaniaFil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; ChileFil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; 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. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; ArgentinaWiley2014-11info: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/11336/5004Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-6990956-540Xenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu296info:eu-repo/semantics/altIdentifier/url/http://gji.oxfordjournals.org/content/199/2/688.full?keytype=ref&ijkey=C143wck5jj1Ds8uinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:09:11Zoai:ri.conicet.gov.ar:11336/5004instacron: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 10:09:11.323CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
title Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
spellingShingle Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
Calixto, Frank J.
Seismic Anisotropy
Seismic Tomography
Continental Margins
Subduction Zone
title_short Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
title_full Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
title_fullStr Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
title_full_unstemmed Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
title_sort Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
dc.creator.none.fl_str_mv Calixto, Frank J.
Robinson, Danielle
Sandvol, Eric
Kay, Suzanne
Abt, David
Fischer, Karen
Heit, Ben
Yuan, Xiaohui
Comte, Diana
Alvarado, Patricia Monica
author Calixto, Frank J.
author_facet Calixto, Frank J.
Robinson, Danielle
Sandvol, Eric
Kay, Suzanne
Abt, David
Fischer, Karen
Heit, Ben
Yuan, Xiaohui
Comte, Diana
Alvarado, Patricia Monica
author_role author
author2 Robinson, Danielle
Sandvol, Eric
Kay, Suzanne
Abt, David
Fischer, Karen
Heit, Ben
Yuan, Xiaohui
Comte, Diana
Alvarado, Patricia Monica
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Seismic Anisotropy
Seismic Tomography
Continental Margins
Subduction Zone
topic Seismic Anisotropy
Seismic Tomography
Continental Margins
Subduction Zone
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.
Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados Unidos
Fil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados Unidos
Fil: Abt, David. ExxonMobil Exploration Company; Estados Unidos
Fil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados Unidos
Fil: Heit, Ben. GeoForschungsZentrum Potsdam; Alemania
Fil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; Chile
Fil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; 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. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
description We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.
publishDate 2014
dc.date.none.fl_str_mv 2014-11
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/11336/5004
Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-699
0956-540X
url http://hdl.handle.net/11336/5004
identifier_str_mv Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-699
0956-540X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu296
info:eu-repo/semantics/altIdentifier/url/http://gji.oxfordjournals.org/content/199/2/688.full?keytype=ref&ijkey=C143wck5jj1Ds8u
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
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
_version_ 1844613967472754688
score 13.070432