Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina

This paper is included in the Special Publication entitled 'The proto- Andean margin of Gondwana', edited by R.J. Pankhurst and C.W. Rapela. 40Ar/ 39Ar incremental-release ages have been determined for muscovite and hornblende concentrates prepared from basement rocks of the Sierra de Pie...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Ramos, V.A., Dallmeyer, R.D., Vujovich, G.
Formato: SER
Materias:
age determination
Gondwana
Paleozoic
tectonic evolution
tectonic reconstruction
Argentina
Entovalva
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03058719_v142_n_p143_Ramos
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03058719_v142_n_p143_Ramos
record_format dspace
spelling todo:paper_03058719_v142_n_p143_Ramos2023-10-03T15:21:59Z Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina Ramos, V.A. Dallmeyer, R.D. Vujovich, G. age determination Gondwana Paleozoic tectonic evolution tectonic reconstruction Argentina Entovalva This paper is included in the Special Publication entitled 'The proto- Andean margin of Gondwana', edited by R.J. Pankhurst and C.W. Rapela. 40Ar/ 39Ar incremental-release ages have been determined for muscovite and hornblende concentrates prepared from basement rocks of the Sierra de Pie de Palo, in the western Sierras Pampeanas, east of the Early Palaeozoic Precordillera. The basement is mainly represented by variably metamorphosed units, including ophiolites, orthogneisses and schists. Previous U-Pb, Rb-Sr, K-Ar, and 40Ar/ 39Ar dating of magmatic and metamorphic zircons from the basement has indicated a Middle Proterozoic age. The 40Ar/ 39Ar plateau ages constrain a series of ductile deformational events that are correlated with development of structural discontinuities in adjacent foreland basins. The following deformational events are postulated: (1) initiation of collision and drowning of the Precordillera platform against Gondwana (470-460 Ma); (2) flexural extension associated with normal faulting due to tectonic loading of the Gondwana margin; and (3) development of a foreland basin (450-430 Ma). These Mid-Ordovician-Silurian events were related to collision of several exotic Early Palaeozoic terranes along the Gondwana margin. The Punta Negra foreland basin developed further west during Early to Mid-Devonian (410-380 Ma) times, and was linked to the beginning of the docking of the Chilenia terrane along the western margin of the Precordillera. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03058719_v142_n_p143_Ramos
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic age determination
Gondwana
Paleozoic
tectonic evolution
tectonic reconstruction
Argentina
Entovalva
spellingShingle age determination
Gondwana
Paleozoic
tectonic evolution
tectonic reconstruction
Argentina
Entovalva
Ramos, V.A.
Dallmeyer, R.D.
Vujovich, G.
Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
topic_facet age determination
Gondwana
Paleozoic
tectonic evolution
tectonic reconstruction
Argentina
Entovalva
description This paper is included in the Special Publication entitled 'The proto- Andean margin of Gondwana', edited by R.J. Pankhurst and C.W. Rapela. 40Ar/ 39Ar incremental-release ages have been determined for muscovite and hornblende concentrates prepared from basement rocks of the Sierra de Pie de Palo, in the western Sierras Pampeanas, east of the Early Palaeozoic Precordillera. The basement is mainly represented by variably metamorphosed units, including ophiolites, orthogneisses and schists. Previous U-Pb, Rb-Sr, K-Ar, and 40Ar/ 39Ar dating of magmatic and metamorphic zircons from the basement has indicated a Middle Proterozoic age. The 40Ar/ 39Ar plateau ages constrain a series of ductile deformational events that are correlated with development of structural discontinuities in adjacent foreland basins. The following deformational events are postulated: (1) initiation of collision and drowning of the Precordillera platform against Gondwana (470-460 Ma); (2) flexural extension associated with normal faulting due to tectonic loading of the Gondwana margin; and (3) development of a foreland basin (450-430 Ma). These Mid-Ordovician-Silurian events were related to collision of several exotic Early Palaeozoic terranes along the Gondwana margin. The Punta Negra foreland basin developed further west during Early to Mid-Devonian (410-380 Ma) times, and was linked to the beginning of the docking of the Chilenia terrane along the western margin of the Precordillera.
format SER
author Ramos, V.A.
Dallmeyer, R.D.
Vujovich, G.
author_facet Ramos, V.A.
Dallmeyer, R.D.
Vujovich, G.
author_sort Ramos, V.A.
title Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
title_short Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
title_full Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
title_fullStr Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
title_full_unstemmed Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina
title_sort time constraints on the early palaeozoic docking of the precordillera, central argentina
url http://hdl.handle.net/20.500.12110/paper_03058719_v142_n_p143_Ramos
work_keys_str_mv AT ramosva timeconstraintsontheearlypalaeozoicdockingoftheprecordilleracentralargentina
AT dallmeyerrd timeconstraintsontheearlypalaeozoicdockingoftheprecordilleracentralargentina
AT vujovichg timeconstraintsontheearlypalaeozoicdockingoftheprecordilleracentralargentina
_version_ 1782030934565978112

Ejemplares similares