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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/228868
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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 Técnicas2025-09-29T09:37:50Zoai: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:34982025-09-29 09:37:50.565CONICET 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 info:ar-repo/semantics/documentoDeConferencia |
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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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/ |
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application/pdf application/pdf application/pdf application/pdf |
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Internacional |
dc.publisher.none.fl_str_mv |
Universidad de Concepción |
publisher.none.fl_str_mv |
Universidad de Concepción |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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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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