Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)

Autores
Iannelli, Sofía; Litvak, Vanesa Dafne; Medina Gallo, Nicolás; Traun, Marie; Søager, Nina; Lucassen, Friedrich; Kasemann, Simone; Folguera Telichevsky, Andres
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Plio-Pleistocene magmatism in the Southern Central Andes (34–38 °S) developed contemporaneously with inferred steepening and destabilization of the subducted Nazca plate associated with a slab tearing at 38°S. Within this setting, arc-related magmatic activity developed in N-S striking belts. Particularly, the studied Varvarco Volcanic Field (VVF) formed in an unusual western retroarc position (70 °W), between the eastern retroarc (69°30’ W) and the present-day arc (68°30’ W). Here we present new field data along with major, minor, and trace elements analyses, Sr-Nd-Pb isotope systematics, and a zircon U/Pb age of ~2.36 Ma to better constrain the linkage between emplacement of the VVF during the Nazca plate steepening and the westward migration of the asthenospheric wedge. The VVF is characterized by basic to intermediate lavas interbedded with pyroclastic deposits, and rhyolitic intrusives. The Basal Lava Flows are calc-alkaline basaltic andesites to andesites, whereas the Upper Lava Flows are less evolved tholeiitic basalts to basaltic andesites. Steepening of the Nazca plate and the onset of the upper plate extension during the VVF emplacement favored the rapid ascent of the latest VVF magma pulses, which underwent low degrees of fractional crystallization. A regional comparison is made to evaluate the impact of the variable tectonic setting on Plio-Pleistocene Andean magmatism. The VVF magmatism shows an arc-like signature, although less pronounced than the present-day volcanic arc. This behavior is also seen when considering all Plio-Pleistocene western retroarc volcanism, whose moderate slab fluids input is associated with their higher distance to the trench relative to the main volcanic arc. Meanwhile, the upwelling of a plume-like structure associated with the Nazca plate tearing has only affected the southern Payenia eastern retroarc volcanoes and the southeastern magmatic units of the western retroarc located just above the tearing.
Fil: Iannelli, Sofía. 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
Fil: Litvak, Vanesa Dafne. 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
Fil: Medina Gallo, Nicolás. Universidad de Buenos Aires; Argentina
Fil: Traun, Marie. Universidad de Copenhagen; Dinamarca
Fil: Søager, Nina. Universidad de Copenhagen; Dinamarca
Fil: Lucassen, Friedrich. Universitat Bremen; Alemania
Fil: Kasemann, Simone. Universitat Bremen; Alemania
Fil: Folguera Telichevsky, Andres. 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
GEOCHEMISTRY
ANDEAN
MAGMATISM
GEODYNAMICS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/268353
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)Iannelli, SofíaLitvak, Vanesa DafneMedina Gallo, NicolásTraun, MarieSøager, NinaLucassen, FriedrichKasemann, SimoneFolguera Telichevsky, AndresGEOCHEMISTRYANDEANMAGMATISMGEODYNAMICShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Plio-Pleistocene magmatism in the Southern Central Andes (34–38 °S) developed contemporaneously with inferred steepening and destabilization of the subducted Nazca plate associated with a slab tearing at 38°S. Within this setting, arc-related magmatic activity developed in N-S striking belts. Particularly, the studied Varvarco Volcanic Field (VVF) formed in an unusual western retroarc position (70 °W), between the eastern retroarc (69°30’ W) and the present-day arc (68°30’ W). Here we present new field data along with major, minor, and trace elements analyses, Sr-Nd-Pb isotope systematics, and a zircon U/Pb age of ~2.36 Ma to better constrain the linkage between emplacement of the VVF during the Nazca plate steepening and the westward migration of the asthenospheric wedge. The VVF is characterized by basic to intermediate lavas interbedded with pyroclastic deposits, and rhyolitic intrusives. The Basal Lava Flows are calc-alkaline basaltic andesites to andesites, whereas the Upper Lava Flows are less evolved tholeiitic basalts to basaltic andesites. Steepening of the Nazca plate and the onset of the upper plate extension during the VVF emplacement favored the rapid ascent of the latest VVF magma pulses, which underwent low degrees of fractional crystallization. A regional comparison is made to evaluate the impact of the variable tectonic setting on Plio-Pleistocene Andean magmatism. The VVF magmatism shows an arc-like signature, although less pronounced than the present-day volcanic arc. This behavior is also seen when considering all Plio-Pleistocene western retroarc volcanism, whose moderate slab fluids input is associated with their higher distance to the trench relative to the main volcanic arc. Meanwhile, the upwelling of a plume-like structure associated with the Nazca plate tearing has only affected the southern Payenia eastern retroarc volcanoes and the southeastern magmatic units of the western retroarc located just above the tearing.Fil: Iannelli, Sofía. 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"; ArgentinaFil: Litvak, Vanesa Dafne. 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"; ArgentinaFil: Medina Gallo, Nicolás. Universidad de Buenos Aires; ArgentinaFil: Traun, Marie. Universidad de Copenhagen; DinamarcaFil: Søager, Nina. Universidad de Copenhagen; DinamarcaFil: Lucassen, Friedrich. Universitat Bremen; AlemaniaFil: Kasemann, Simone. Universitat Bremen; AlemaniaFil: Folguera Telichevsky, Andres. 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"; ArgentinaAmer Journal Science2025-04info: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/11336/268353Iannelli, Sofía; Litvak, Vanesa Dafne; Medina Gallo, Nicolás; Traun, Marie; Søager, Nina; et al.; Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S); Amer Journal Science; American Journal of Science; 325; 4-2025; 1-290002-9599CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://ajsonline.org/article/130876-plio-pleistocene-western-retroarc-magmatic-evolution-and-its-relation-with-variable-subduction-settings-in-the-southern-central-andes-34-38-sinfo:eu-repo/semantics/altIdentifier/doi/10.2475/001c.130876info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:56:08Zoai:ri.conicet.gov.ar:11336/268353instacron: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 09:56:09.227CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
title Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
spellingShingle Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
Iannelli, Sofía
GEOCHEMISTRY
ANDEAN
MAGMATISM
GEODYNAMICS
title_short Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
title_full Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
title_fullStr Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
title_full_unstemmed Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
title_sort Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S)
dc.creator.none.fl_str_mv Iannelli, Sofía
Litvak, Vanesa Dafne
Medina Gallo, Nicolás
Traun, Marie
Søager, Nina
Lucassen, Friedrich
Kasemann, Simone
Folguera Telichevsky, Andres
author Iannelli, Sofía
author_facet Iannelli, Sofía
Litvak, Vanesa Dafne
Medina Gallo, Nicolás
Traun, Marie
Søager, Nina
Lucassen, Friedrich
Kasemann, Simone
Folguera Telichevsky, Andres
author_role author
author2 Litvak, Vanesa Dafne
Medina Gallo, Nicolás
Traun, Marie
Søager, Nina
Lucassen, Friedrich
Kasemann, Simone
Folguera Telichevsky, Andres
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv GEOCHEMISTRY
ANDEAN
MAGMATISM
GEODYNAMICS
topic GEOCHEMISTRY
ANDEAN
MAGMATISM
GEODYNAMICS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Plio-Pleistocene magmatism in the Southern Central Andes (34–38 °S) developed contemporaneously with inferred steepening and destabilization of the subducted Nazca plate associated with a slab tearing at 38°S. Within this setting, arc-related magmatic activity developed in N-S striking belts. Particularly, the studied Varvarco Volcanic Field (VVF) formed in an unusual western retroarc position (70 °W), between the eastern retroarc (69°30’ W) and the present-day arc (68°30’ W). Here we present new field data along with major, minor, and trace elements analyses, Sr-Nd-Pb isotope systematics, and a zircon U/Pb age of ~2.36 Ma to better constrain the linkage between emplacement of the VVF during the Nazca plate steepening and the westward migration of the asthenospheric wedge. The VVF is characterized by basic to intermediate lavas interbedded with pyroclastic deposits, and rhyolitic intrusives. The Basal Lava Flows are calc-alkaline basaltic andesites to andesites, whereas the Upper Lava Flows are less evolved tholeiitic basalts to basaltic andesites. Steepening of the Nazca plate and the onset of the upper plate extension during the VVF emplacement favored the rapid ascent of the latest VVF magma pulses, which underwent low degrees of fractional crystallization. A regional comparison is made to evaluate the impact of the variable tectonic setting on Plio-Pleistocene Andean magmatism. The VVF magmatism shows an arc-like signature, although less pronounced than the present-day volcanic arc. This behavior is also seen when considering all Plio-Pleistocene western retroarc volcanism, whose moderate slab fluids input is associated with their higher distance to the trench relative to the main volcanic arc. Meanwhile, the upwelling of a plume-like structure associated with the Nazca plate tearing has only affected the southern Payenia eastern retroarc volcanoes and the southeastern magmatic units of the western retroarc located just above the tearing.
Fil: Iannelli, Sofía. 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
Fil: Litvak, Vanesa Dafne. 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
Fil: Medina Gallo, Nicolás. Universidad de Buenos Aires; Argentina
Fil: Traun, Marie. Universidad de Copenhagen; Dinamarca
Fil: Søager, Nina. Universidad de Copenhagen; Dinamarca
Fil: Lucassen, Friedrich. Universitat Bremen; Alemania
Fil: Kasemann, Simone. Universitat Bremen; Alemania
Fil: Folguera Telichevsky, Andres. 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 Plio-Pleistocene magmatism in the Southern Central Andes (34–38 °S) developed contemporaneously with inferred steepening and destabilization of the subducted Nazca plate associated with a slab tearing at 38°S. Within this setting, arc-related magmatic activity developed in N-S striking belts. Particularly, the studied Varvarco Volcanic Field (VVF) formed in an unusual western retroarc position (70 °W), between the eastern retroarc (69°30’ W) and the present-day arc (68°30’ W). Here we present new field data along with major, minor, and trace elements analyses, Sr-Nd-Pb isotope systematics, and a zircon U/Pb age of ~2.36 Ma to better constrain the linkage between emplacement of the VVF during the Nazca plate steepening and the westward migration of the asthenospheric wedge. The VVF is characterized by basic to intermediate lavas interbedded with pyroclastic deposits, and rhyolitic intrusives. The Basal Lava Flows are calc-alkaline basaltic andesites to andesites, whereas the Upper Lava Flows are less evolved tholeiitic basalts to basaltic andesites. Steepening of the Nazca plate and the onset of the upper plate extension during the VVF emplacement favored the rapid ascent of the latest VVF magma pulses, which underwent low degrees of fractional crystallization. A regional comparison is made to evaluate the impact of the variable tectonic setting on Plio-Pleistocene Andean magmatism. The VVF magmatism shows an arc-like signature, although less pronounced than the present-day volcanic arc. This behavior is also seen when considering all Plio-Pleistocene western retroarc volcanism, whose moderate slab fluids input is associated with their higher distance to the trench relative to the main volcanic arc. Meanwhile, the upwelling of a plume-like structure associated with the Nazca plate tearing has only affected the southern Payenia eastern retroarc volcanoes and the southeastern magmatic units of the western retroarc located just above the tearing.
publishDate 2025
dc.date.none.fl_str_mv 2025-04
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/11336/268353
Iannelli, Sofía; Litvak, Vanesa Dafne; Medina Gallo, Nicolás; Traun, Marie; Søager, Nina; et al.; Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S); Amer Journal Science; American Journal of Science; 325; 4-2025; 1-29
0002-9599
CONICET Digital
CONICET
url http://hdl.handle.net/11336/268353
identifier_str_mv Iannelli, Sofía; Litvak, Vanesa Dafne; Medina Gallo, Nicolás; Traun, Marie; Søager, Nina; et al.; Plio-Pleistocene Western Retroarc Magmatic Evolution and Its Relation With Variable Subduction Settings in the Southern Central Andes (34-38 °S); Amer Journal Science; American Journal of Science; 325; 4-2025; 1-29
0002-9599
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ajsonline.org/article/130876-plio-pleistocene-western-retroarc-magmatic-evolution-and-its-relation-with-variable-subduction-settings-in-the-southern-central-andes-34-38-s
info:eu-repo/semantics/altIdentifier/doi/10.2475/001c.130876
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Amer Journal Science
publisher.none.fl_str_mv Amer Journal Science
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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