Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)

Autores
Iannelli, Sofía; Litvak, Vanesa Dafne; Fennell, Lucas Martín; Fernández Paz, Lucía; Encinas, Alfonso; Folguera, Andrés
Año de publicación
2018
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
By Late Cretaceous times (80Ma) the Farallon-Aluk spreading ridge started to subduct beneath theSouth American plate. The southward migration of this ridge would have influenced magmatism asseen by the contrasting signature of the magmatic units along the Southern Central Andes (32-40°S).To the north (32°S) magmatism is represented by the Juncal Formation (~69Ma), which is described astypical arc-like rocks with medium to high-K andesitic to dacitic composition. In contrast, southerncoeval magmatism (~35º30?S), Los Ángeles Unit (~67Ma), presents a basaltic to andesitic compositionwith a tholeiitic signature that enriched towards the younger magmatic pulses. Moreover, the LosÁngeles Unit presents lower arc-like signature and partial melting degrees than the Juncal Formation,as stated by their contrasting La/Ta, Nb/Y and Nb/Zr ratios. Late Cretaceous-early Paleocenemagmatism continues southward (~37-38ºS) represented by the stronger arc-like signature ofNaunauco Group magmatism, which shows an increase in slab fluids contributions and partial meltingdegrees.The variable geochemical signature seen in these magmatic units could be linked to the passage of thesegmented Farallon-Aluk spreading ridge. The southward movement of Farallon-Aluk ridge and itscontinuous subduction beneath the Andean margin involved periods of highly dry ocean crustsubduction associated with spreading centers. Thus, these spreading centers can be linked to thedevelopment of slab-windows and the input of a more enriched source as seen in the Los Ángeles Unitmagmatism. At the same time, hydrated ocean crust subducting at other latitudes can provoke thedevelopment of typical arc-like magmatism represented by the Juncal Formation and the NaunaucoGroup.The collision of Farallon-Aluk ridge could be also reflected in the contrasting geochemical features ofEocene arc-derived rocks outcropping further south, when Farallon-Aluk ridge reached Patagonianlatitudes (~42°S). By this time, a calc-alkaline typical arc-like magmatism developed at 37°-38°Slatitudes (~45-39Ma). In contrast, Pilcaniyeu Belt magmatism at 40°S (~44Ma) showed a moreenriched and alkaline source with minor slab-fluid input.In conclusion the subduction and southward migration of Farallon-Aluk spreading ridge, together withits typical segmented geometry could explain the contrasting geochemical signatures of coetaneousmagmatic units along the Andean margin since Latest Cretaceous to Eocene times.
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: Fennell, Lucas Martín. 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: Fernández Paz, Lucía. 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: Encinas, Alfonso. Universidad de Concepción; Chile
Fil: Folguera, Andrés. 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
XV Congreso Geológico Chileno
Concepción
Chile
Universidad de Concepción
Colegio de Geólogos de Chile
Sociedad Geológica de Chile
Materia
Cretaceous
Volcanism
Isotopic signature
Arc-like
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:11336/228868
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)Iannelli, SofíaLitvak, Vanesa DafneFennell, Lucas MartínFernández Paz, LucíaEncinas, AlfonsoFolguera, AndrésCretaceousVolcanismIsotopic signatureArc-likehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1By Late Cretaceous times (80Ma) the Farallon-Aluk spreading ridge started to subduct beneath theSouth American plate. The southward migration of this ridge would have influenced magmatism asseen by the contrasting signature of the magmatic units along the Southern Central Andes (32-40°S).To the north (32°S) magmatism is represented by the Juncal Formation (~69Ma), which is described astypical arc-like rocks with medium to high-K andesitic to dacitic composition. In contrast, southerncoeval magmatism (~35º30?S), Los Ángeles Unit (~67Ma), presents a basaltic to andesitic compositionwith a tholeiitic signature that enriched towards the younger magmatic pulses. Moreover, the LosÁngeles Unit presents lower arc-like signature and partial melting degrees than the Juncal Formation,as stated by their contrasting La/Ta, Nb/Y and Nb/Zr ratios. Late Cretaceous-early Paleocenemagmatism continues southward (~37-38ºS) represented by the stronger arc-like signature ofNaunauco Group magmatism, which shows an increase in slab fluids contributions and partial meltingdegrees.The variable geochemical signature seen in these magmatic units could be linked to the passage of thesegmented Farallon-Aluk spreading ridge. The southward movement of Farallon-Aluk ridge and itscontinuous subduction beneath the Andean margin involved periods of highly dry ocean crustsubduction associated with spreading centers. Thus, these spreading centers can be linked to thedevelopment of slab-windows and the input of a more enriched source as seen in the Los Ángeles Unitmagmatism. At the same time, hydrated ocean crust subducting at other latitudes can provoke thedevelopment of typical arc-like magmatism represented by the Juncal Formation and the NaunaucoGroup.The collision of Farallon-Aluk ridge could be also reflected in the contrasting geochemical features ofEocene arc-derived rocks outcropping further south, when Farallon-Aluk ridge reached Patagonianlatitudes (~42°S). By this time, a calc-alkaline typical arc-like magmatism developed at 37°-38°Slatitudes (~45-39Ma). In contrast, Pilcaniyeu Belt magmatism at 40°S (~44Ma) showed a moreenriched and alkaline source with minor slab-fluid input.In conclusion the subduction and southward migration of Farallon-Aluk spreading ridge, together withits typical segmented geometry could explain the contrasting geochemical signatures of coetaneousmagmatic units along the Andean margin since Latest Cretaceous to Eocene times.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: Fennell, Lucas Martín. 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: Fernández Paz, Lucía. 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: Encinas, Alfonso. Universidad de Concepción; ChileFil: Folguera, Andrés. 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"; ArgentinaXV Congreso Geológico ChilenoConcepciónChileUniversidad de ConcepciónColegio de Geólogos de ChileSociedad Geológica de ChileUniversidad de Concepción2018info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/228868Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS); XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1125-1125CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://congresogeologicochileno.cl/wp-content/uploads/2018/12/Libro-de-Actas-XVCongresoGeologicoChileno2018-2.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:06:01Zoai:ri.conicet.gov.ar:11336/228868instacron: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:34982025-10-22 11:06:01.845CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
title Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
spellingShingle Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
Iannelli, Sofía
Cretaceous
Volcanism
Isotopic signature
Arc-like
title_short Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
title_full Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
title_fullStr Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
title_full_unstemmed Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
title_sort Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS)
dc.creator.none.fl_str_mv Iannelli, Sofía
Litvak, Vanesa Dafne
Fennell, Lucas Martín
Fernández Paz, Lucía
Encinas, Alfonso
Folguera, Andrés
author Iannelli, Sofía
author_facet Iannelli, Sofía
Litvak, Vanesa Dafne
Fennell, Lucas Martín
Fernández Paz, Lucía
Encinas, Alfonso
Folguera, Andrés
author_role author
author2 Litvak, Vanesa Dafne
Fennell, Lucas Martín
Fernández Paz, Lucía
Encinas, Alfonso
Folguera, Andrés
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Cretaceous
Volcanism
Isotopic signature
Arc-like
topic Cretaceous
Volcanism
Isotopic signature
Arc-like
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv By Late Cretaceous times (80Ma) the Farallon-Aluk spreading ridge started to subduct beneath theSouth American plate. The southward migration of this ridge would have influenced magmatism asseen by the contrasting signature of the magmatic units along the Southern Central Andes (32-40°S).To the north (32°S) magmatism is represented by the Juncal Formation (~69Ma), which is described astypical arc-like rocks with medium to high-K andesitic to dacitic composition. In contrast, southerncoeval magmatism (~35º30?S), Los Ángeles Unit (~67Ma), presents a basaltic to andesitic compositionwith a tholeiitic signature that enriched towards the younger magmatic pulses. Moreover, the LosÁngeles Unit presents lower arc-like signature and partial melting degrees than the Juncal Formation,as stated by their contrasting La/Ta, Nb/Y and Nb/Zr ratios. Late Cretaceous-early Paleocenemagmatism continues southward (~37-38ºS) represented by the stronger arc-like signature ofNaunauco Group magmatism, which shows an increase in slab fluids contributions and partial meltingdegrees.The variable geochemical signature seen in these magmatic units could be linked to the passage of thesegmented Farallon-Aluk spreading ridge. The southward movement of Farallon-Aluk ridge and itscontinuous subduction beneath the Andean margin involved periods of highly dry ocean crustsubduction associated with spreading centers. Thus, these spreading centers can be linked to thedevelopment of slab-windows and the input of a more enriched source as seen in the Los Ángeles Unitmagmatism. At the same time, hydrated ocean crust subducting at other latitudes can provoke thedevelopment of typical arc-like magmatism represented by the Juncal Formation and the NaunaucoGroup.The collision of Farallon-Aluk ridge could be also reflected in the contrasting geochemical features ofEocene arc-derived rocks outcropping further south, when Farallon-Aluk ridge reached Patagonianlatitudes (~42°S). By this time, a calc-alkaline typical arc-like magmatism developed at 37°-38°Slatitudes (~45-39Ma). In contrast, Pilcaniyeu Belt magmatism at 40°S (~44Ma) showed a moreenriched and alkaline source with minor slab-fluid input.In conclusion the subduction and southward migration of Farallon-Aluk spreading ridge, together withits typical segmented geometry could explain the contrasting geochemical signatures of coetaneousmagmatic units along the Andean margin since Latest Cretaceous to Eocene times.
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: Fennell, Lucas Martín. 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: Fernández Paz, Lucía. 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: Encinas, Alfonso. Universidad de Concepción; Chile
Fil: Folguera, Andrés. 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
XV Congreso Geológico Chileno
Concepción
Chile
Universidad de Concepción
Colegio de Geólogos de Chile
Sociedad Geológica de Chile
description By Late Cretaceous times (80Ma) the Farallon-Aluk spreading ridge started to subduct beneath theSouth American plate. The southward migration of this ridge would have influenced magmatism asseen by the contrasting signature of the magmatic units along the Southern Central Andes (32-40°S).To the north (32°S) magmatism is represented by the Juncal Formation (~69Ma), which is described astypical arc-like rocks with medium to high-K andesitic to dacitic composition. In contrast, southerncoeval magmatism (~35º30?S), Los Ángeles Unit (~67Ma), presents a basaltic to andesitic compositionwith a tholeiitic signature that enriched towards the younger magmatic pulses. Moreover, the LosÁngeles Unit presents lower arc-like signature and partial melting degrees than the Juncal Formation,as stated by their contrasting La/Ta, Nb/Y and Nb/Zr ratios. Late Cretaceous-early Paleocenemagmatism continues southward (~37-38ºS) represented by the stronger arc-like signature ofNaunauco Group magmatism, which shows an increase in slab fluids contributions and partial meltingdegrees.The variable geochemical signature seen in these magmatic units could be linked to the passage of thesegmented Farallon-Aluk spreading ridge. The southward movement of Farallon-Aluk ridge and itscontinuous subduction beneath the Andean margin involved periods of highly dry ocean crustsubduction associated with spreading centers. Thus, these spreading centers can be linked to thedevelopment of slab-windows and the input of a more enriched source as seen in the Los Ángeles Unitmagmatism. At the same time, hydrated ocean crust subducting at other latitudes can provoke thedevelopment of typical arc-like magmatism represented by the Juncal Formation and the NaunaucoGroup.The collision of Farallon-Aluk ridge could be also reflected in the contrasting geochemical features ofEocene arc-derived rocks outcropping further south, when Farallon-Aluk ridge reached Patagonianlatitudes (~42°S). By this time, a calc-alkaline typical arc-like magmatism developed at 37°-38°Slatitudes (~45-39Ma). In contrast, Pilcaniyeu Belt magmatism at 40°S (~44Ma) showed a moreenriched and alkaline source with minor slab-fluid input.In conclusion the subduction and southward migration of Farallon-Aluk spreading ridge, together withits typical segmented geometry could explain the contrasting geochemical signatures of coetaneousmagmatic units along the Andean margin since Latest Cretaceous to Eocene times.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Book
http://purl.org/coar/resource_type/c_5794
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status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/228868
Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS); XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1125-1125
CONICET Digital
CONICET
url http://hdl.handle.net/11336/228868
identifier_str_mv Late Cretaceous to Paleogene magmatic evolution and its relation with the Farallon-Aluk spreading ridge along the Southern Central to North Patagonian Andes (32-42ºS); XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1125-1125
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://congresogeologicochileno.cl/wp-content/uploads/2018/12/Libro-de-Actas-XVCongresoGeologicoChileno2018-2.pdf
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Universidad de Concepción
publisher.none.fl_str_mv Universidad de Concepción
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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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