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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/87288
Ver los metadatos del registro completo
id |
SEDICI_6345f4723cdcd9509251f4dd7b795c17 |
---|---|
oai_identifier_str |
oai:sedici.unlp.edu.ar:10915/87288 |
network_acronym_str |
SEDICI |
repository_id_str |
1329 |
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 |
repository.mail.fl_str_mv |
alira@sedici.unlp.edu.ar |
_version_ |
1846064147484114944 |
score |
13.22299 |