Delamination of southern Puna lithosphere revealed by body wave attenuation tomography

Autores
Liang, Xiaofeng; Sandvol, Eric; Kay, Suzanne; Heit, Benjamin; Yuan, Xiaohui; Mulcahy, Patrick; Chen, Chen; Brown, Larry; Comte, Diana; Alvarado, Patricia Monica
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007?2009 by scientists fromthe U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment,we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northernmargin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches ~100 km depth beneath the northern part of the array but only ~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistentwith the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.
Fil: Liang, Xiaofeng. Chinese Academy of Sciences. Institute of Geology and Geophysics; China. University of Missouri. Department of Geological Sciences; Estados Unidos
Fil: Sandvol, Eric. University of Missouri. Department of Geological Sciences; Estados Unidos
Fil: Kay, Suzanne. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Heit, Benjamin. Deutsches GeoForschungsZentrum; Alemania
Fil: Yuan, Xiaohui. Deutsches GeoForschungsZentrum; Alemania
Fil: Mulcahy, Patrick. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Chen, Chen. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Brown, Larry. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Comte, Diana. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geofísica; Chile
Fil: Alvarado, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
Materia
TOMOGRAPHY
CRUSTAL
BROADBAND
PUNA
EARTHQUAKES
SEISMICITY
SEISMOLOGY
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:11336/5005
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/5005
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Delamination of southern Puna lithosphere revealed by body wave attenuation tomographyLiang, XiaofengSandvol, EricKay, SuzanneHeit, BenjaminYuan, XiaohuiMulcahy, PatrickChen, ChenBrown, LarryComte, DianaAlvarado, Patricia MonicaTOMOGRAPHYCRUSTALBROADBANDPUNAEARTHQUAKESSEISMICITYSEISMOLOGYhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007?2009 by scientists fromthe U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment,we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northernmargin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches ~100 km depth beneath the northern part of the array but only ~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistentwith the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.Fil: Liang, Xiaofeng. Chinese Academy of Sciences. Institute of Geology and Geophysics; China. University of Missouri. Department of Geological Sciences; Estados UnidosFil: Sandvol, Eric. University of Missouri. Department of Geological Sciences; Estados UnidosFil: Kay, Suzanne. Cornell University. Department of Earth and Atmospheric Science; Estados UnidosFil: Heit, Benjamin. Deutsches GeoForschungsZentrum; AlemaniaFil: Yuan, Xiaohui. Deutsches GeoForschungsZentrum; AlemaniaFil: Mulcahy, Patrick. Cornell University. Department of Earth and Atmospheric Science; Estados UnidosFil: Chen, Chen. Cornell University. Department of Earth and Atmospheric Science; Estados UnidosFil: Brown, Larry. Cornell University. Department of Earth and Atmospheric Science; Estados UnidosFil: Comte, Diana. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geofísica; ChileFil: Alvarado, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; ArgentinaAmerican Geophysical Union2014-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5005Liang, Xiaofeng; Sandvol, Eric; Kay, Suzanne; Heit, Benjamin; Yuan, Xiaohui; et al.; Delamination of southern Puna lithosphere revealed by body wave attenuation tomography; American Geophysical Union; Journal Of Geophysical Research; 119; 1; 1-2014; 549-5660148-0227enginfo:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/wol1/doi/10.1002/2013JB010309/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1002/ 2013JB010309info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:12:06Zoai:ri.conicet.gov.ar:11336/5005instacron: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 10:12:06.727CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
title Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
spellingShingle Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
Liang, Xiaofeng
TOMOGRAPHY
CRUSTAL
BROADBAND
PUNA
EARTHQUAKES
SEISMICITY
SEISMOLOGY
title_short Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
title_full Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
title_fullStr Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
title_full_unstemmed Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
title_sort Delamination of southern Puna lithosphere revealed by body wave attenuation tomography
dc.creator.none.fl_str_mv Liang, Xiaofeng
Sandvol, Eric
Kay, Suzanne
Heit, Benjamin
Yuan, Xiaohui
Mulcahy, Patrick
Chen, Chen
Brown, Larry
Comte, Diana
Alvarado, Patricia Monica
author Liang, Xiaofeng
author_facet Liang, Xiaofeng
Sandvol, Eric
Kay, Suzanne
Heit, Benjamin
Yuan, Xiaohui
Mulcahy, Patrick
Chen, Chen
Brown, Larry
Comte, Diana
Alvarado, Patricia Monica
author_role author
author2 Sandvol, Eric
Kay, Suzanne
Heit, Benjamin
Yuan, Xiaohui
Mulcahy, Patrick
Chen, Chen
Brown, Larry
Comte, Diana
Alvarado, Patricia Monica
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv TOMOGRAPHY
CRUSTAL
BROADBAND
PUNA
EARTHQUAKES
SEISMICITY
SEISMOLOGY
topic TOMOGRAPHY
CRUSTAL
BROADBAND
PUNA
EARTHQUAKES
SEISMICITY
SEISMOLOGY
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 southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007?2009 by scientists fromthe U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment,we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northernmargin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches ~100 km depth beneath the northern part of the array but only ~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistentwith the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.
Fil: Liang, Xiaofeng. Chinese Academy of Sciences. Institute of Geology and Geophysics; China. University of Missouri. Department of Geological Sciences; Estados Unidos
Fil: Sandvol, Eric. University of Missouri. Department of Geological Sciences; Estados Unidos
Fil: Kay, Suzanne. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Heit, Benjamin. Deutsches GeoForschungsZentrum; Alemania
Fil: Yuan, Xiaohui. Deutsches GeoForschungsZentrum; Alemania
Fil: Mulcahy, Patrick. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Chen, Chen. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Brown, Larry. Cornell University. Department of Earth and Atmospheric Science; Estados Unidos
Fil: Comte, Diana. Universidad de Chile. Facultad de Ciencias Físicas y Matemáticas. Departamento de Geofísica; Chile
Fil: Alvarado, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina
description The southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007?2009 by scientists fromthe U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment,we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northernmargin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches ~100 km depth beneath the northern part of the array but only ~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistentwith the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.
publishDate 2014
dc.date.none.fl_str_mv 2014-01
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/11336/5005
Liang, Xiaofeng; Sandvol, Eric; Kay, Suzanne; Heit, Benjamin; Yuan, Xiaohui; et al.; Delamination of southern Puna lithosphere revealed by body wave attenuation tomography; American Geophysical Union; Journal Of Geophysical Research; 119; 1; 1-2014; 549-566
0148-0227
url http://hdl.handle.net/11336/5005
identifier_str_mv Liang, Xiaofeng; Sandvol, Eric; Kay, Suzanne; Heit, Benjamin; Yuan, Xiaohui; et al.; Delamination of southern Puna lithosphere revealed by body wave attenuation tomography; American Geophysical Union; Journal Of Geophysical Research; 119; 1; 1-2014; 549-566
0148-0227
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/wol1/doi/10.1002/2013JB010309/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1002/ 2013JB010309
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 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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