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

Autores
Mercader, Roberto C.; Zaffarana, Claudia B.; Somoza, Rubén; Orts, Darío L.; Boltshauser, Bárbara; Ruiz González, Víctor; Puigdomenech, Carla
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Contiene material suplementario.
Facultad de Ciencias Exactas
Materia
Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/87288

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network_name_str SEDICI (UNLP)
spelling Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: implications for pluton emplacement and the Gastre fault systemMercader, Roberto C.Zaffarana, Claudia B.Somoza, RubénOrts, Darío L.Boltshauser, BárbaraRuiz González, VíctorPuigdomenech, CarlaGeologíaCiencias NaturalesCentral patagonian batholithLate TriassicArgentinaThe 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.Contiene material suplementario.Facultad de Ciencias Exactas2017-10-27info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1973-1992http://sedici.unlp.edu.ar/handle/10915/87288enginfo:eu-repo/semantics/altIdentifier/issn/1553-040Xinfo:eu-repo/semantics/altIdentifier/doi/10.1130/GES01493.1info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:09:02Zoai:sedici.unlp.edu.ar:10915/87288Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:09:03.164SEDICI (UNLP) - Universidad Nacional de La Platafalse
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
Mercader, Roberto C.
Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
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 Mercader, Roberto C.
Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author Mercader, Roberto C.
author_facet Mercader, Roberto C.
Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author_role author
author2 Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
topic Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
dc.description.none.fl_txt_mv 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.
Contiene material suplementario.
Facultad de Ciencias Exactas
description 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.
publishDate 2017
dc.date.none.fl_str_mv 2017-10-27
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/87288
url http://sedici.unlp.edu.ar/handle/10915/87288
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1553-040X
info:eu-repo/semantics/altIdentifier/doi/10.1130/GES01493.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
1973-1992
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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