A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision

Autores
Lobo, Constanza; Gonzalez Guillot, Mauricio Alberto; Ghiglione, Matias
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Between Viedma and San Martín lakes, in an area of 1200 km2 that partly covers the Southern Patagonian cordillera and the Miocene-Pliocene extra-Andean basaltic plateaus, mafic dike swarms crop out which have not been studied previously. As a result of mapping on satellite images and in the field more than 1500 dikes were identified. The dikes crop out in a zone between rear-arc calc-alkaline intrusions to the west and tholeiitic-alkaline plateau basalts to the east, within the internal and external fold-thrust belt. In order to understand the genetic relationship between the dikes, other igneous units in the region and the structures of the Andean orogeny, a petrological study (including petrography and geochemistry) and a structural analysis of the dike orientations were carried out. The dikes were emplaced close to the surface (<1 km). Three predominant compositions were recognized: basalts, which predominate, followed by tephrites and andesites, the latter restricted to a single sector. We propose preliminarily the following correlations: (i) the dikes of tephritic composition with the Río Carbón Essexite (Eocene), (ii) the andesites with the Chaltén Adakite (Miocene) and (iii) the basaltic dikes with the Pliocene basaltic plateaus. All these units are related in the literature to different stages of ridge subduction and slab window development. The dikes present variable, but not random, preferential orientations, with no relation with composition. Our analysis suggests that dike emplacement was controlled by previous anisotropies in a heterogeneous and very shallow crust. The anisotropy in the internal fold-thrust belt was achieved mainly during Eocene and/or Late Cretaceous contraction, whereas that in the external fold-thrust belt was developed during a less significant Miocene compressive event, thus resulting in a more homogeneous dike orientation. The vertical disposition of the dikes indicates horizontal stretching, as previously proposed for the last stages of Andean growth.
Fil: Lobo, Constanza. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Gonzalez Guillot, Mauricio Alberto. Universidad Nacional de Tierra del Fuego. Instituto de Ciencias Polares, Recursos Naturales y Ambiente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Ghiglione, Matias. 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
FOLD-THRUST BELT
MAFIC DIKES
SLAB WINDOW
SOUTHERN PATAGONIA
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:11336/210308
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/210308
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collisionLobo, ConstanzaGonzalez Guillot, Mauricio AlbertoGhiglione, MatiasFOLD-THRUST BELTMAFIC DIKESSLAB WINDOWSOUTHERN PATAGONIAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Between Viedma and San Martín lakes, in an area of 1200 km2 that partly covers the Southern Patagonian cordillera and the Miocene-Pliocene extra-Andean basaltic plateaus, mafic dike swarms crop out which have not been studied previously. As a result of mapping on satellite images and in the field more than 1500 dikes were identified. The dikes crop out in a zone between rear-arc calc-alkaline intrusions to the west and tholeiitic-alkaline plateau basalts to the east, within the internal and external fold-thrust belt. In order to understand the genetic relationship between the dikes, other igneous units in the region and the structures of the Andean orogeny, a petrological study (including petrography and geochemistry) and a structural analysis of the dike orientations were carried out. The dikes were emplaced close to the surface (<1 km). Three predominant compositions were recognized: basalts, which predominate, followed by tephrites and andesites, the latter restricted to a single sector. We propose preliminarily the following correlations: (i) the dikes of tephritic composition with the Río Carbón Essexite (Eocene), (ii) the andesites with the Chaltén Adakite (Miocene) and (iii) the basaltic dikes with the Pliocene basaltic plateaus. All these units are related in the literature to different stages of ridge subduction and slab window development. The dikes present variable, but not random, preferential orientations, with no relation with composition. Our analysis suggests that dike emplacement was controlled by previous anisotropies in a heterogeneous and very shallow crust. The anisotropy in the internal fold-thrust belt was achieved mainly during Eocene and/or Late Cretaceous contraction, whereas that in the external fold-thrust belt was developed during a less significant Miocene compressive event, thus resulting in a more homogeneous dike orientation. The vertical disposition of the dikes indicates horizontal stretching, as previously proposed for the last stages of Andean growth.Fil: Lobo, Constanza. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Gonzalez Guillot, Mauricio Alberto. Universidad Nacional de Tierra del Fuego. Instituto de Ciencias Polares, Recursos Naturales y Ambiente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Ghiglione, Matias. 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"; ArgentinaPergamon-Elsevier Science Ltd2022-11info: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/11336/210308Lobo, Constanza; Gonzalez Guillot, Mauricio Alberto; Ghiglione, Matias; A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 119; 103955; 11-2022; 1-460895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981122002449info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2022.103955info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:41:32Zoai:ri.conicet.gov.ar:11336/210308instacron: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 09:41:33.197CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
title A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
spellingShingle A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
Lobo, Constanza
FOLD-THRUST BELT
MAFIC DIKES
SLAB WINDOW
SOUTHERN PATAGONIA
title_short A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
title_full A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
title_fullStr A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
title_full_unstemmed A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
title_sort A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision
dc.creator.none.fl_str_mv Lobo, Constanza
Gonzalez Guillot, Mauricio Alberto
Ghiglione, Matias
author Lobo, Constanza
author_facet Lobo, Constanza
Gonzalez Guillot, Mauricio Alberto
Ghiglione, Matias
author_role author
author2 Gonzalez Guillot, Mauricio Alberto
Ghiglione, Matias
author2_role author
author
dc.subject.none.fl_str_mv FOLD-THRUST BELT
MAFIC DIKES
SLAB WINDOW
SOUTHERN PATAGONIA
topic FOLD-THRUST BELT
MAFIC DIKES
SLAB WINDOW
SOUTHERN PATAGONIA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Between Viedma and San Martín lakes, in an area of 1200 km2 that partly covers the Southern Patagonian cordillera and the Miocene-Pliocene extra-Andean basaltic plateaus, mafic dike swarms crop out which have not been studied previously. As a result of mapping on satellite images and in the field more than 1500 dikes were identified. The dikes crop out in a zone between rear-arc calc-alkaline intrusions to the west and tholeiitic-alkaline plateau basalts to the east, within the internal and external fold-thrust belt. In order to understand the genetic relationship between the dikes, other igneous units in the region and the structures of the Andean orogeny, a petrological study (including petrography and geochemistry) and a structural analysis of the dike orientations were carried out. The dikes were emplaced close to the surface (<1 km). Three predominant compositions were recognized: basalts, which predominate, followed by tephrites and andesites, the latter restricted to a single sector. We propose preliminarily the following correlations: (i) the dikes of tephritic composition with the Río Carbón Essexite (Eocene), (ii) the andesites with the Chaltén Adakite (Miocene) and (iii) the basaltic dikes with the Pliocene basaltic plateaus. All these units are related in the literature to different stages of ridge subduction and slab window development. The dikes present variable, but not random, preferential orientations, with no relation with composition. Our analysis suggests that dike emplacement was controlled by previous anisotropies in a heterogeneous and very shallow crust. The anisotropy in the internal fold-thrust belt was achieved mainly during Eocene and/or Late Cretaceous contraction, whereas that in the external fold-thrust belt was developed during a less significant Miocene compressive event, thus resulting in a more homogeneous dike orientation. The vertical disposition of the dikes indicates horizontal stretching, as previously proposed for the last stages of Andean growth.
Fil: Lobo, Constanza. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Gonzalez Guillot, Mauricio Alberto. Universidad Nacional de Tierra del Fuego. Instituto de Ciencias Polares, Recursos Naturales y Ambiente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Ghiglione, Matias. 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 Between Viedma and San Martín lakes, in an area of 1200 km2 that partly covers the Southern Patagonian cordillera and the Miocene-Pliocene extra-Andean basaltic plateaus, mafic dike swarms crop out which have not been studied previously. As a result of mapping on satellite images and in the field more than 1500 dikes were identified. The dikes crop out in a zone between rear-arc calc-alkaline intrusions to the west and tholeiitic-alkaline plateau basalts to the east, within the internal and external fold-thrust belt. In order to understand the genetic relationship between the dikes, other igneous units in the region and the structures of the Andean orogeny, a petrological study (including petrography and geochemistry) and a structural analysis of the dike orientations were carried out. The dikes were emplaced close to the surface (<1 km). Three predominant compositions were recognized: basalts, which predominate, followed by tephrites and andesites, the latter restricted to a single sector. We propose preliminarily the following correlations: (i) the dikes of tephritic composition with the Río Carbón Essexite (Eocene), (ii) the andesites with the Chaltén Adakite (Miocene) and (iii) the basaltic dikes with the Pliocene basaltic plateaus. All these units are related in the literature to different stages of ridge subduction and slab window development. The dikes present variable, but not random, preferential orientations, with no relation with composition. Our analysis suggests that dike emplacement was controlled by previous anisotropies in a heterogeneous and very shallow crust. The anisotropy in the internal fold-thrust belt was achieved mainly during Eocene and/or Late Cretaceous contraction, whereas that in the external fold-thrust belt was developed during a less significant Miocene compressive event, thus resulting in a more homogeneous dike orientation. The vertical disposition of the dikes indicates horizontal stretching, as previously proposed for the last stages of Andean growth.
publishDate 2022
dc.date.none.fl_str_mv 2022-11
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/11336/210308
Lobo, Constanza; Gonzalez Guillot, Mauricio Alberto; Ghiglione, Matias; A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 119; 103955; 11-2022; 1-46
0895-9811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/210308
identifier_str_mv Lobo, Constanza; Gonzalez Guillot, Mauricio Alberto; Ghiglione, Matias; A petrological and structural assessment of mafic dike swarms in the Patagonian fold-thrust belt during seismic ridge collision; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 119; 103955; 11-2022; 1-46
0895-9811
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://www.sciencedirect.com/science/article/pii/S0895981122002449
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2022.103955
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 Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
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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