The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview

The southernmost outcrops of the Río de la Plata cratonic region are exposed in the Tandilia System in eastern Argentina. The geological evolution comprises mainly an igneous-metamorphic Paleoproterozoic basement named Buenos Aires Complex, which is covered by Neoproterozoic to Early Paleozoic sedim...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autor principal: Cingolani, Carlos Alberto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Geología
Río de la Plata craton
Argentina
Igneousmetamorphic complex
Paleoproterozoic
Neoproterozoic-Early Paleozoic cover
Tectonic model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/166606
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-166606
record_format dspace
spelling I19-R120-10915-1666062024-05-31T20:09:13Z http://sedici.unlp.edu.ar/handle/10915/166606 The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview Cingolani, Carlos Alberto 2010-11-03 2024-05-31T14:19:58Z en Geología Río de la Plata craton Argentina Igneousmetamorphic complex Paleoproterozoic Neoproterozoic-Early Paleozoic cover Tectonic model The southernmost outcrops of the Río de la Plata cratonic region are exposed in the Tandilia System in eastern Argentina. The geological evolution comprises mainly an igneous-metamorphic Paleoproterozoic basement named Buenos Aires Complex, which is covered by Neoproterozoic to Early Paleozoic sedimentary units which display subhorizontal bedding. The basement of calc-alkaline signature consists mainly of granitic-tonalitic gneisses, migmatites, amphibolites, some ultramafic rocks, and granitoid plutons. Subordinate rock-types include schists, marbles, and dykes of acid and mafic composition. Tandilia was recognized as an important shear belt district with mylonite rocks derived mainly from granitoids. The tectonic scenario seems related to juvenile accretion event (2.25–2.12 Ga) along an active continental margin, followed by continental collision (2.1–2.08 Ga) after U–Pb zircon data. The collisional tectonic setting caused thrusting and transcurrent faulting favouring the anatexis of the crustal rocks. The tholeiitic dykes constrain the time of crustal extension associated with the last stages of the belt evolution. The basement was preserved from younger orogenies such as those of the Brasiliano cycle. After a long paleoweathering process, the Sierras Bayas Group (c. 185 m thick) represents a record of the first Neoproterozoic sedimentary unit (siliciclastic, dolostones, shales, limestones), superposed by Cerro Negro Formation (c. 150–400 m thick, siliciclastics) assigned to Upper Neoproterozoic age. The final sedimentary transgression during Early Paleozoic was the Balcarce Formation (c. 90–450 m thick) deposited over all the mentioned Precambrian units. Based on all the geological background, a tectonic evolution is offered. Centro de Investigaciones Geológicas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 221-242
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Río de la Plata craton
Argentina
Igneousmetamorphic complex
Paleoproterozoic
Neoproterozoic-Early Paleozoic cover
Tectonic model
spellingShingle Geología
Río de la Plata craton
Argentina
Igneousmetamorphic complex
Paleoproterozoic
Neoproterozoic-Early Paleozoic cover
Tectonic model
Cingolani, Carlos Alberto
The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
topic_facet Geología
Río de la Plata craton
Argentina
Igneousmetamorphic complex
Paleoproterozoic
Neoproterozoic-Early Paleozoic cover
Tectonic model
description The southernmost outcrops of the Río de la Plata cratonic region are exposed in the Tandilia System in eastern Argentina. The geological evolution comprises mainly an igneous-metamorphic Paleoproterozoic basement named Buenos Aires Complex, which is covered by Neoproterozoic to Early Paleozoic sedimentary units which display subhorizontal bedding. The basement of calc-alkaline signature consists mainly of granitic-tonalitic gneisses, migmatites, amphibolites, some ultramafic rocks, and granitoid plutons. Subordinate rock-types include schists, marbles, and dykes of acid and mafic composition. Tandilia was recognized as an important shear belt district with mylonite rocks derived mainly from granitoids. The tectonic scenario seems related to juvenile accretion event (2.25–2.12 Ga) along an active continental margin, followed by continental collision (2.1–2.08 Ga) after U–Pb zircon data. The collisional tectonic setting caused thrusting and transcurrent faulting favouring the anatexis of the crustal rocks. The tholeiitic dykes constrain the time of crustal extension associated with the last stages of the belt evolution. The basement was preserved from younger orogenies such as those of the Brasiliano cycle. After a long paleoweathering process, the Sierras Bayas Group (c. 185 m thick) represents a record of the first Neoproterozoic sedimentary unit (siliciclastic, dolostones, shales, limestones), superposed by Cerro Negro Formation (c. 150–400 m thick, siliciclastics) assigned to Upper Neoproterozoic age. The final sedimentary transgression during Early Paleozoic was the Balcarce Formation (c. 90–450 m thick) deposited over all the mentioned Precambrian units. Based on all the geological background, a tectonic evolution is offered.
format Articulo
Articulo
author Cingolani, Carlos Alberto
author_facet Cingolani, Carlos Alberto
author_sort Cingolani, Carlos Alberto
title The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
title_short The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
title_full The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
title_fullStr The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
title_full_unstemmed The Tandilia System of Argentina as a southern extension of the Río de la Plata craton: an overview
title_sort tandilia system of argentina as a southern extension of the río de la plata craton: an overview
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/166606
work_keys_str_mv AT cingolanicarlosalberto thetandiliasystemofargentinaasasouthernextensionoftheriodelaplatacratonanoverview
AT cingolanicarlosalberto tandiliasystemofargentinaasasouthernextensionoftheriodelaplatacratonanoverview
_version_ 1807223332008886272

Ejemplares similares