Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography

Autores
Rodríguez, Emily E.; Portner, Daniel Evan; Beck, Susan L.; Rocha, Marcelo P.; Bianchi, Marcelo B.; Assumpção, Marcelo; Ruiz, Mario; Alvarado, Patricia Monica; Condori, Cristobal; Lynner, Colton
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Andean Subduction Zone is one of the longest continuous subduction zones on Earth. The relative simplicity of the two-plate system has makes it an ideal natural laboratory to study the dynamics in subduction zones. We measure teleseismic S and SKS traveltime residuals at >1000 seismic stations that have been deployed across South America over the last 30 yr to produce a finite-frequency teleseismic S-wave tomography model of the mantle beneath the Andean Subduction Zone related to the Nazca Plate, spanning from ~5°N to 45°S and from depths of ~130 to 1200 km. Within our model, the subducted Nazca slab is imaged as a fast velocity seismic anomaly. The geometry and amplitude of the Nazca slab anomaly varies along the margin while the slab anomaly continues into the lower mantle along the entirety of the subduction margin. Beneath northern Brazil, the Nazca slab appears to stagnate at ~1000 km depth and extend eastward subhorizontally for >2000 km. South of 25°S the slab anomaly in the lower mantle extends offshore of eastern Argentina, hence we do not image if a similar stagnation occurs. We image several distinct features surrounding the slab including two vertically oriented slow seismic velocity anomalies: one beneath the Peruvian flat slab and the other beneath the Paraná Basin of Brazil. The presence of the latter anomaly directly adjacent to the stagnant Nazca slab suggests that the plume, known as the Paraná Plume, may be a focused upwelling formed in response to slab stagnation in the lower mantle. Additionally, we image a high amplitude fast seismic velocity anomaly beneath the Chile trench at the latitude of the Sierras Pampeanas which extends from ~400 to ~1000 km depth. This anomaly may be the remnants of an older, detached slab, however its relationship with the Nazca-South America subduction zone remains enigmatic.
Fil: Rodríguez, Emily E.. University of Arizona; Estados Unidos
Fil: Portner, Daniel Evan. No especifíca;
Fil: Beck, Susan L.. University of Arizona; Estados Unidos
Fil: Rocha, Marcelo P.. Universidade do Brasília; Brasil
Fil: Bianchi, Marcelo B.. Universidade de Sao Paulo; Brasil
Fil: Assumpção, Marcelo. Universidade de Sao Paulo; Brasil
Fil: Ruiz, Mario. Escuela Politécnica Nacional; Ecuador
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 Conicet - San Juan. Centro de Investigaciones de la Geosfera y Biosfera. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
Fil: Condori, Cristobal. Universidade do Brasília; Brasil
Fil: Lynner, Colton. University Of Delaware; Estados Unidos
Materia
DYNAMICS OF LITHOSPHERE AND MANTLE
SEISMIC TOMOGRAPHY
SOUTH AMERICA
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:11336/183354
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/183354
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomographyRodríguez, Emily E.Portner, Daniel EvanBeck, Susan L.Rocha, Marcelo P.Bianchi, Marcelo B.Assumpção, MarceloRuiz, MarioAlvarado, Patricia MonicaCondori, CristobalLynner, ColtonDYNAMICS OF LITHOSPHERE AND MANTLESEISMIC TOMOGRAPHYSOUTH AMERICAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Andean Subduction Zone is one of the longest continuous subduction zones on Earth. The relative simplicity of the two-plate system has makes it an ideal natural laboratory to study the dynamics in subduction zones. We measure teleseismic S and SKS traveltime residuals at >1000 seismic stations that have been deployed across South America over the last 30 yr to produce a finite-frequency teleseismic S-wave tomography model of the mantle beneath the Andean Subduction Zone related to the Nazca Plate, spanning from ~5°N to 45°S and from depths of ~130 to 1200 km. Within our model, the subducted Nazca slab is imaged as a fast velocity seismic anomaly. The geometry and amplitude of the Nazca slab anomaly varies along the margin while the slab anomaly continues into the lower mantle along the entirety of the subduction margin. Beneath northern Brazil, the Nazca slab appears to stagnate at ~1000 km depth and extend eastward subhorizontally for >2000 km. South of 25°S the slab anomaly in the lower mantle extends offshore of eastern Argentina, hence we do not image if a similar stagnation occurs. We image several distinct features surrounding the slab including two vertically oriented slow seismic velocity anomalies: one beneath the Peruvian flat slab and the other beneath the Paraná Basin of Brazil. The presence of the latter anomaly directly adjacent to the stagnant Nazca slab suggests that the plume, known as the Paraná Plume, may be a focused upwelling formed in response to slab stagnation in the lower mantle. Additionally, we image a high amplitude fast seismic velocity anomaly beneath the Chile trench at the latitude of the Sierras Pampeanas which extends from ~400 to ~1000 km depth. This anomaly may be the remnants of an older, detached slab, however its relationship with the Nazca-South America subduction zone remains enigmatic.Fil: Rodríguez, Emily E.. University of Arizona; Estados UnidosFil: Portner, Daniel Evan. No especifíca;Fil: Beck, Susan L.. University of Arizona; Estados UnidosFil: Rocha, Marcelo P.. Universidade do Brasília; BrasilFil: Bianchi, Marcelo B.. Universidade de Sao Paulo; BrasilFil: Assumpção, Marcelo. Universidade de Sao Paulo; BrasilFil: Ruiz, Mario. Escuela Politécnica Nacional; EcuadorFil: 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 Conicet - San Juan. Centro de Investigaciones de la Geosfera y Biosfera. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones de la Geosfera y Biosfera; ArgentinaFil: Condori, Cristobal. Universidade do Brasília; BrasilFil: Lynner, Colton. University Of Delaware; Estados UnidosWiley Blackwell Publishing, Inc2021-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/183354Rodríguez, Emily E.; Portner, Daniel Evan; Beck, Susan L.; Rocha, Marcelo P.; Bianchi, Marcelo B.; et al.; Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 3; 3-2021; 1553-15710956-540XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa536info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:40:31Zoai:ri.conicet.gov.ar:11336/183354instacron: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 10:40:31.98CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
title Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
spellingShingle Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
Rodríguez, Emily E.
DYNAMICS OF LITHOSPHERE AND MANTLE
SEISMIC TOMOGRAPHY
SOUTH AMERICA
title_short Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
title_full Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
title_fullStr Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
title_full_unstemmed Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
title_sort Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography
dc.creator.none.fl_str_mv Rodríguez, Emily E.
Portner, Daniel Evan
Beck, Susan L.
Rocha, Marcelo P.
Bianchi, Marcelo B.
Assumpção, Marcelo
Ruiz, Mario
Alvarado, Patricia Monica
Condori, Cristobal
Lynner, Colton
author Rodríguez, Emily E.
author_facet Rodríguez, Emily E.
Portner, Daniel Evan
Beck, Susan L.
Rocha, Marcelo P.
Bianchi, Marcelo B.
Assumpção, Marcelo
Ruiz, Mario
Alvarado, Patricia Monica
Condori, Cristobal
Lynner, Colton
author_role author
author2 Portner, Daniel Evan
Beck, Susan L.
Rocha, Marcelo P.
Bianchi, Marcelo B.
Assumpção, Marcelo
Ruiz, Mario
Alvarado, Patricia Monica
Condori, Cristobal
Lynner, Colton
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv DYNAMICS OF LITHOSPHERE AND MANTLE
SEISMIC TOMOGRAPHY
SOUTH AMERICA
topic DYNAMICS OF LITHOSPHERE AND MANTLE
SEISMIC TOMOGRAPHY
SOUTH AMERICA
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 Andean Subduction Zone is one of the longest continuous subduction zones on Earth. The relative simplicity of the two-plate system has makes it an ideal natural laboratory to study the dynamics in subduction zones. We measure teleseismic S and SKS traveltime residuals at >1000 seismic stations that have been deployed across South America over the last 30 yr to produce a finite-frequency teleseismic S-wave tomography model of the mantle beneath the Andean Subduction Zone related to the Nazca Plate, spanning from ~5°N to 45°S and from depths of ~130 to 1200 km. Within our model, the subducted Nazca slab is imaged as a fast velocity seismic anomaly. The geometry and amplitude of the Nazca slab anomaly varies along the margin while the slab anomaly continues into the lower mantle along the entirety of the subduction margin. Beneath northern Brazil, the Nazca slab appears to stagnate at ~1000 km depth and extend eastward subhorizontally for >2000 km. South of 25°S the slab anomaly in the lower mantle extends offshore of eastern Argentina, hence we do not image if a similar stagnation occurs. We image several distinct features surrounding the slab including two vertically oriented slow seismic velocity anomalies: one beneath the Peruvian flat slab and the other beneath the Paraná Basin of Brazil. The presence of the latter anomaly directly adjacent to the stagnant Nazca slab suggests that the plume, known as the Paraná Plume, may be a focused upwelling formed in response to slab stagnation in the lower mantle. Additionally, we image a high amplitude fast seismic velocity anomaly beneath the Chile trench at the latitude of the Sierras Pampeanas which extends from ~400 to ~1000 km depth. This anomaly may be the remnants of an older, detached slab, however its relationship with the Nazca-South America subduction zone remains enigmatic.
Fil: Rodríguez, Emily E.. University of Arizona; Estados Unidos
Fil: Portner, Daniel Evan. No especifíca;
Fil: Beck, Susan L.. University of Arizona; Estados Unidos
Fil: Rocha, Marcelo P.. Universidade do Brasília; Brasil
Fil: Bianchi, Marcelo B.. Universidade de Sao Paulo; Brasil
Fil: Assumpção, Marcelo. Universidade de Sao Paulo; Brasil
Fil: Ruiz, Mario. Escuela Politécnica Nacional; Ecuador
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 Conicet - San Juan. Centro de Investigaciones de la Geosfera y Biosfera. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
Fil: Condori, Cristobal. Universidade do Brasília; Brasil
Fil: Lynner, Colton. University Of Delaware; Estados Unidos
description The Andean Subduction Zone is one of the longest continuous subduction zones on Earth. The relative simplicity of the two-plate system has makes it an ideal natural laboratory to study the dynamics in subduction zones. We measure teleseismic S and SKS traveltime residuals at >1000 seismic stations that have been deployed across South America over the last 30 yr to produce a finite-frequency teleseismic S-wave tomography model of the mantle beneath the Andean Subduction Zone related to the Nazca Plate, spanning from ~5°N to 45°S and from depths of ~130 to 1200 km. Within our model, the subducted Nazca slab is imaged as a fast velocity seismic anomaly. The geometry and amplitude of the Nazca slab anomaly varies along the margin while the slab anomaly continues into the lower mantle along the entirety of the subduction margin. Beneath northern Brazil, the Nazca slab appears to stagnate at ~1000 km depth and extend eastward subhorizontally for >2000 km. South of 25°S the slab anomaly in the lower mantle extends offshore of eastern Argentina, hence we do not image if a similar stagnation occurs. We image several distinct features surrounding the slab including two vertically oriented slow seismic velocity anomalies: one beneath the Peruvian flat slab and the other beneath the Paraná Basin of Brazil. The presence of the latter anomaly directly adjacent to the stagnant Nazca slab suggests that the plume, known as the Paraná Plume, may be a focused upwelling formed in response to slab stagnation in the lower mantle. Additionally, we image a high amplitude fast seismic velocity anomaly beneath the Chile trench at the latitude of the Sierras Pampeanas which extends from ~400 to ~1000 km depth. This anomaly may be the remnants of an older, detached slab, however its relationship with the Nazca-South America subduction zone remains enigmatic.
publishDate 2021
dc.date.none.fl_str_mv 2021-03
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/11336/183354
Rodríguez, Emily E.; Portner, Daniel Evan; Beck, Susan L.; Rocha, Marcelo P.; Bianchi, Marcelo B.; et al.; Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 3; 3-2021; 1553-1571
0956-540X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/183354
identifier_str_mv Rodríguez, Emily E.; Portner, Daniel Evan; Beck, Susan L.; Rocha, Marcelo P.; Bianchi, Marcelo B.; et al.; Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 3; 3-2021; 1553-1571
0956-540X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa536
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
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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