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

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 f...

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Detalles Bibliográficos
Autores principales: Mercader, Roberto C., Zaffarana, Claudia B., Somoza, Rubén, Orts, Darío L., Boltshauser, Bárbara, Ruiz González, Víctor, Puigdomenech, Carla
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87288
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87288
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
spellingShingle Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
Mercader, Roberto C.
Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: implications for pluton emplacement and the Gastre fault system
topic_facet Geología
Ciencias Naturales
Central patagonian batholith
Late Triassic
Argentina
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.
format Articulo
Articulo
author Mercader, Roberto C.
Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author_facet Mercader, Roberto C.
Zaffarana, Claudia B.
Somoza, Rubén
Orts, Darío L.
Boltshauser, Bárbara
Ruiz González, Víctor
Puigdomenech, Carla
author_sort Mercader, Roberto C.
title Internal structure of the Late Triassic Central Patagonian batholith at Gastre, southern Argentina: implications for pluton emplacement and the Gastre fault system
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
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87288
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