Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system

Autores
Zaffarana, Claudia Beatriz; Somoza, Rubén; Orts, Darío Leandro; Mercader, Roberto; Boltshauser, Bárbara; Ruiz González, Víctor; Puigdomenech, Carla
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Zaffarana, Claudia Beatriz. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
Fil: Somoza, Rubén. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Orts, Darío Leandro. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
Fil: Mercader, Roberto. Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata. Argentina.
Fil: Boltshauser, Bárbara. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Ruiz González, Víctor. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Puigdomenech, Carla. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.
The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.
Materia
Ciencias Exactas y Naturales
internal structure
pluton emplacement
gastre fault system
Ciencias Exactas y Naturales
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/13366

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network_acronym_str RIDUNRN
repository_id_str 4369
network_name_str RID-UNRN (UNRN)
spelling Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault systemZaffarana, Claudia BeatrizSomoza, RubénOrts, Darío LeandroMercader, RobertoBoltshauser, BárbaraRuiz González, VíctorPuigdomenech, CarlaCiencias Exactas y Naturalesinternal structurepluton emplacementgastre fault systemCiencias Exactas y NaturalesFil: Zaffarana, Claudia Beatriz. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.Fil: Somoza, Rubén. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.Fil: Orts, Darío Leandro. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.Fil: Mercader, Roberto. Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata. Argentina.Fil: Boltshauser, Bárbara. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.Fil: Ruiz González, Víctor. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.Fil: Puigdomenech, Carla. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.Geological Society of America2017-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfZaffarana, C.B., Somoza, R., Orts, D.L., Mercader, R., Boltshauser, B., González, V.R., and Puigdomenech, C., 2017, Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system: Geosphere, v. 13, no. 61553-040Xhttp://rid.unrn.edu.ar/handle/20.500.12049/13366https://doi.org/10.1130/GES01493.1enghttps://pubs.geoscienceworld.org/geosphere13 (6)Geosphereinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-10-16T10:06:14Zoai:rid.unrn.edu.ar:20.500.12049/13366instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-10-16 10:06:14.522RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
dc.title.none.fl_str_mv Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
title Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
spellingShingle Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
Zaffarana, Claudia Beatriz
Ciencias Exactas y Naturales
internal structure
pluton emplacement
gastre fault system
Ciencias Exactas y Naturales
title_short Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
title_full Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
title_fullStr Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
title_full_unstemmed Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
title_sort Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system
dc.creator.none.fl_str_mv Zaffarana, Claudia Beatriz
Somoza, Rubén
Orts, Darío Leandro
Mercader, Roberto
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author Zaffarana, Claudia Beatriz
author_facet Zaffarana, Claudia Beatriz
Somoza, Rubén
Orts, Darío Leandro
Mercader, Roberto
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author_role author
author2 Somoza, Rubén
Orts, Darío Leandro
Mercader, Roberto
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas y Naturales
internal structure
pluton emplacement
gastre fault system
Ciencias Exactas y Naturales
topic Ciencias Exactas y Naturales
internal structure
pluton emplacement
gastre fault system
Ciencias Exactas y Naturales
dc.description.none.fl_txt_mv Fil: Zaffarana, Claudia Beatriz. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
Fil: Somoza, Rubén. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Orts, Darío Leandro. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
Fil: Mercader, Roberto. Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata. Argentina.
Fil: Boltshauser, Bárbara. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Ruiz González, Víctor. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
Fil: Puigdomenech, Carla. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.
The Central Patagonian batholith (CPB) comprises two Late Triassic calcalkaline plutonic suites (the Gastre superunit of 221 ± 2 Ma and the Lipetrén superunit of 215 ± 1 Ma) which have been interpreted as a record of major dextral motion along the transcontinental NW-SE–striking subvertical Gastre fault system in Jurassic times. We performed a detailed study of the internal structure of the CPB through structural and anisotropy of magnetic susceptibility (AMS) techniques. The Gastre superunit reveals a very consistent pattern of NW-SE–striking steeply dipping magmatic foliations. Tectonic fabrics within the CPB are scarce and generally parallel to the magmatic fabrics. The magmatic and solid-state lineations within the CPB are steeply, intermediately, or shallowly plunging. The combination of flattened magmatic and solid-state fabrics with subvertical orientations and with steep to shallow lineations, together with the kinematic indicators in two mylonite belts with suspected CPB protoliths, suggests that the Gastre superunit was emplaced within a sinistral transpressive regime. The shallower stocks of the Lipetrén superunit are more isotropic and have magmatic fabrics associated with magma chamber dynamics. The deformation of the CPB is coaxial with the late Paleozoic deformation in the hosting Calcatapul Formation. The late Paleozoic deformation in the North Patagonian Massif generated widespread NW-SE subvertical fractures which could have aided the emplacement of the CPB. The internal structure of the CPB does not support a model of dextral strike-slip movements on major Jurassic faults.
description Fil: Zaffarana, Claudia Beatriz. Instituto de Investigación en Paleobiología y Geología, Consejo Nacional de Investigaciones Científicas y Técnicas. Argentina.
publishDate 2017
dc.date.none.fl_str_mv 2017-09
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 Zaffarana, C.B., Somoza, R., Orts, D.L., Mercader, R., Boltshauser, B., González, V.R., and Puigdomenech, C., 2017, Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system: Geosphere, v. 13, no. 6
1553-040X
http://rid.unrn.edu.ar/handle/20.500.12049/13366
https://doi.org/10.1130/GES01493.1
identifier_str_mv Zaffarana, C.B., Somoza, R., Orts, D.L., Mercader, R., Boltshauser, B., González, V.R., and Puigdomenech, C., 2017, Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: Implications for pluton emplacement and the Gastre fault system: Geosphere, v. 13, no. 6
1553-040X
url http://rid.unrn.edu.ar/handle/20.500.12049/13366
https://doi.org/10.1130/GES01493.1
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://pubs.geoscienceworld.org/geosphere
13 (6)
Geosphere
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
repository.mail.fl_str_mv rid@unrn.edu.ar
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