The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab

Autores
Kay, S. Mahlburg; Ardolino, A. A.; Gorring, M. L.; Ramos, Victor Alberto
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Oligo-Miocene Somuncura province is the largest (∼55 000 km2) back-arc mafic volcanic field in Patagonia, and one of Earth's largest with no clear link to a hotspot or major extension. Major and trace element and Sr-Nd-Pb isotopic data suggest involvement of a plume-like component in the mantle magma source mixed with hydrous, but not high field strength element (HFSE)-depleted components, from a disintegrating subducting plate. Magmatism is attributed to mantle upwelling related to disturbances during plate reorganization, possibly at a time when the South America plate was nearly stationary over the underlying mantle. Melting was enhanced by hydration of the mantle during Paleogene subduction. Crustal contamination was minimal in a refractory crust that had been extensively melted in the Jurassic. Eruption began with low-volume intraplate alkaline mafic flows with depleted Nd-Sr isotopic signatures. These were followed by voluminous ∼29-25 Ma tholeiitic mafic flows with flat light and steep heavy rare earth element (REE) patterns, intraplate-like La/Ta ratios, arc-like Ba/La ratios and enriched Sr-Nd isotopic signatures. Their source can be explained by mixing EM1-Tristan da Cunha-like and depleted mantle components with subduction-related components. Post-plateau ∼24-17 Ma alkaline flows with steep REE patterns, high incompatible element abundances, and depleted Sr-Nd isotopic signatures mark the ebbing of the mantle upwelling.
Fil: Kay, S. Mahlburg. Cornell University; Estados Unidos
Fil: Ardolino, A. A.. Dirección Nacional de Mineria y Geología; Argentina
Fil: Gorring, M. L.. Montclair State University; Estados Unidos
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Materia
LARGE IGNEOUS PROVINCE (LIP)
PATAGONIA
PLUME-LIKE UPWELLING
SLAB INTERACTION
SOMUNCURA PLATEAU
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:11336/92751
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/92751
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slabKay, S. MahlburgArdolino, A. A.Gorring, M. L.Ramos, Victor AlbertoLARGE IGNEOUS PROVINCE (LIP)PATAGONIAPLUME-LIKE UPWELLINGSLAB INTERACTIONSOMUNCURA PLATEAUhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Oligo-Miocene Somuncura province is the largest (∼55 000 km2) back-arc mafic volcanic field in Patagonia, and one of Earth's largest with no clear link to a hotspot or major extension. Major and trace element and Sr-Nd-Pb isotopic data suggest involvement of a plume-like component in the mantle magma source mixed with hydrous, but not high field strength element (HFSE)-depleted components, from a disintegrating subducting plate. Magmatism is attributed to mantle upwelling related to disturbances during plate reorganization, possibly at a time when the South America plate was nearly stationary over the underlying mantle. Melting was enhanced by hydration of the mantle during Paleogene subduction. Crustal contamination was minimal in a refractory crust that had been extensively melted in the Jurassic. Eruption began with low-volume intraplate alkaline mafic flows with depleted Nd-Sr isotopic signatures. These were followed by voluminous ∼29-25 Ma tholeiitic mafic flows with flat light and steep heavy rare earth element (REE) patterns, intraplate-like La/Ta ratios, arc-like Ba/La ratios and enriched Sr-Nd isotopic signatures. Their source can be explained by mixing EM1-Tristan da Cunha-like and depleted mantle components with subduction-related components. Post-plateau ∼24-17 Ma alkaline flows with steep REE patterns, high incompatible element abundances, and depleted Sr-Nd isotopic signatures mark the ebbing of the mantle upwelling.Fil: Kay, S. Mahlburg. Cornell University; Estados UnidosFil: Ardolino, A. A.. Dirección Nacional de Mineria y Geología; ArgentinaFil: Gorring, M. L.. Montclair State University; Estados UnidosFil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaOxford University Press2007-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/92751Kay, S. Mahlburg; Ardolino, A. A.; Gorring, M. L.; Ramos, Victor Alberto; The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab; Oxford University Press; Journal Of Petrology; 48; 1; 12-2007; 43-770022-3530CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egl053info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/48/1/43/1489017info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:13:42Zoai:ri.conicet.gov.ar:11336/92751instacron: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 10:13:42.361CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
title The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
spellingShingle The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
Kay, S. Mahlburg
LARGE IGNEOUS PROVINCE (LIP)
PATAGONIA
PLUME-LIKE UPWELLING
SLAB INTERACTION
SOMUNCURA PLATEAU
title_short The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
title_full The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
title_fullStr The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
title_full_unstemmed The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
title_sort The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab
dc.creator.none.fl_str_mv Kay, S. Mahlburg
Ardolino, A. A.
Gorring, M. L.
Ramos, Victor Alberto
author Kay, S. Mahlburg
author_facet Kay, S. Mahlburg
Ardolino, A. A.
Gorring, M. L.
Ramos, Victor Alberto
author_role author
author2 Ardolino, A. A.
Gorring, M. L.
Ramos, Victor Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv LARGE IGNEOUS PROVINCE (LIP)
PATAGONIA
PLUME-LIKE UPWELLING
SLAB INTERACTION
SOMUNCURA PLATEAU
topic LARGE IGNEOUS PROVINCE (LIP)
PATAGONIA
PLUME-LIKE UPWELLING
SLAB INTERACTION
SOMUNCURA PLATEAU
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 Oligo-Miocene Somuncura province is the largest (∼55 000 km2) back-arc mafic volcanic field in Patagonia, and one of Earth's largest with no clear link to a hotspot or major extension. Major and trace element and Sr-Nd-Pb isotopic data suggest involvement of a plume-like component in the mantle magma source mixed with hydrous, but not high field strength element (HFSE)-depleted components, from a disintegrating subducting plate. Magmatism is attributed to mantle upwelling related to disturbances during plate reorganization, possibly at a time when the South America plate was nearly stationary over the underlying mantle. Melting was enhanced by hydration of the mantle during Paleogene subduction. Crustal contamination was minimal in a refractory crust that had been extensively melted in the Jurassic. Eruption began with low-volume intraplate alkaline mafic flows with depleted Nd-Sr isotopic signatures. These were followed by voluminous ∼29-25 Ma tholeiitic mafic flows with flat light and steep heavy rare earth element (REE) patterns, intraplate-like La/Ta ratios, arc-like Ba/La ratios and enriched Sr-Nd isotopic signatures. Their source can be explained by mixing EM1-Tristan da Cunha-like and depleted mantle components with subduction-related components. Post-plateau ∼24-17 Ma alkaline flows with steep REE patterns, high incompatible element abundances, and depleted Sr-Nd isotopic signatures mark the ebbing of the mantle upwelling.
Fil: Kay, S. Mahlburg. Cornell University; Estados Unidos
Fil: Ardolino, A. A.. Dirección Nacional de Mineria y Geología; Argentina
Fil: Gorring, M. L.. Montclair State University; Estados Unidos
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
description The Oligo-Miocene Somuncura province is the largest (∼55 000 km2) back-arc mafic volcanic field in Patagonia, and one of Earth's largest with no clear link to a hotspot or major extension. Major and trace element and Sr-Nd-Pb isotopic data suggest involvement of a plume-like component in the mantle magma source mixed with hydrous, but not high field strength element (HFSE)-depleted components, from a disintegrating subducting plate. Magmatism is attributed to mantle upwelling related to disturbances during plate reorganization, possibly at a time when the South America plate was nearly stationary over the underlying mantle. Melting was enhanced by hydration of the mantle during Paleogene subduction. Crustal contamination was minimal in a refractory crust that had been extensively melted in the Jurassic. Eruption began with low-volume intraplate alkaline mafic flows with depleted Nd-Sr isotopic signatures. These were followed by voluminous ∼29-25 Ma tholeiitic mafic flows with flat light and steep heavy rare earth element (REE) patterns, intraplate-like La/Ta ratios, arc-like Ba/La ratios and enriched Sr-Nd isotopic signatures. Their source can be explained by mixing EM1-Tristan da Cunha-like and depleted mantle components with subduction-related components. Post-plateau ∼24-17 Ma alkaline flows with steep REE patterns, high incompatible element abundances, and depleted Sr-Nd isotopic signatures mark the ebbing of the mantle upwelling.
publishDate 2007
dc.date.none.fl_str_mv 2007-12
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/11336/92751
Kay, S. Mahlburg; Ardolino, A. A.; Gorring, M. L.; Ramos, Victor Alberto; The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab; Oxford University Press; Journal Of Petrology; 48; 1; 12-2007; 43-77
0022-3530
CONICET Digital
CONICET
url http://hdl.handle.net/11336/92751
identifier_str_mv Kay, S. Mahlburg; Ardolino, A. A.; Gorring, M. L.; Ramos, Victor Alberto; The somuncura large igneous province in Patagonia: Interaction of a transient mantle thermal anomaly with a subducting slab; Oxford University Press; Journal Of Petrology; 48; 1; 12-2007; 43-77
0022-3530
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/petrology/egl053
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/48/1/43/1489017
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 Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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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