Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window

Autores
Burd, Aurora I.; Booker, John R.; Mackie, Randall; Pomposiello, Maria Cristina; Favetto, Alicia Beatriz
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.
Fil: Burd, Aurora I.. University of Washington; Estados Unidos
Fil: Booker, John R.. University of Washington; Estados Unidos
Fil: Mackie, Randall. Land General Geophysics; Italia
Fil: Pomposiello, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentina
Fil: Favetto, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentina
Materia
THREE-DIMENSIONAL MAGNETOTELLURIC INVERSION
SLAB WINDOW
NAZCA FLAT SLAB SUBDUCTION
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:11336/18376
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab windowBurd, Aurora I.Booker, John R.Mackie, RandallPomposiello, Maria CristinaFavetto, Alicia BeatrizTHREE-DIMENSIONAL MAGNETOTELLURIC INVERSIONSLAB WINDOWNAZCA FLAT SLAB SUBDUCTIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.Fil: Burd, Aurora I.. University of Washington; Estados UnidosFil: Booker, John R.. University of Washington; Estados UnidosFil: Mackie, Randall. Land General Geophysics; ItaliaFil: Pomposiello, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; ArgentinaFil: Favetto, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; ArgentinaAmerican Geophysical Union2013-08info: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/11336/18376Burd, Aurora I.; Booker, John R.; Mackie, Randall; Pomposiello, Maria Cristina; Favetto, Alicia Beatriz; Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window; American Geophysical Union; Geochemistry Geophysics Geosystems; 14; 8; 8-2013; 3192-32091525-2027CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/ggge.20213info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20213/abstractinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:53:02Zoai:ri.conicet.gov.ar:11336/18376instacron: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:34982025-09-03 09:53:02.977CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
title Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
spellingShingle Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
Burd, Aurora I.
THREE-DIMENSIONAL MAGNETOTELLURIC INVERSION
SLAB WINDOW
NAZCA FLAT SLAB SUBDUCTION
title_short Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
title_full Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
title_fullStr Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
title_full_unstemmed Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
title_sort Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
dc.creator.none.fl_str_mv Burd, Aurora I.
Booker, John R.
Mackie, Randall
Pomposiello, Maria Cristina
Favetto, Alicia Beatriz
author Burd, Aurora I.
author_facet Burd, Aurora I.
Booker, John R.
Mackie, Randall
Pomposiello, Maria Cristina
Favetto, Alicia Beatriz
author_role author
author2 Booker, John R.
Mackie, Randall
Pomposiello, Maria Cristina
Favetto, Alicia Beatriz
author2_role author
author
author
author
dc.subject.none.fl_str_mv THREE-DIMENSIONAL MAGNETOTELLURIC INVERSION
SLAB WINDOW
NAZCA FLAT SLAB SUBDUCTION
topic THREE-DIMENSIONAL MAGNETOTELLURIC INVERSION
SLAB WINDOW
NAZCA FLAT SLAB SUBDUCTION
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 present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.
Fil: Burd, Aurora I.. University of Washington; Estados Unidos
Fil: Booker, John R.. University of Washington; Estados Unidos
Fil: Mackie, Randall. Land General Geophysics; Italia
Fil: Pomposiello, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentina
Fil: Favetto, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentina
description We present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.
publishDate 2013
dc.date.none.fl_str_mv 2013-08
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/11336/18376
Burd, Aurora I.; Booker, John R.; Mackie, Randall; Pomposiello, Maria Cristina; Favetto, Alicia Beatriz; Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window; American Geophysical Union; Geochemistry Geophysics Geosystems; 14; 8; 8-2013; 3192-3209
1525-2027
CONICET Digital
CONICET
url http://hdl.handle.net/11336/18376
identifier_str_mv Burd, Aurora I.; Booker, John R.; Mackie, Randall; Pomposiello, Maria Cristina; Favetto, Alicia Beatriz; Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window; American Geophysical Union; Geochemistry Geophysics Geosystems; 14; 8; 8-2013; 3192-3209
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/doi/10.1002/ggge.20213
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20213/abstract
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 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 13.13397

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