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...
Guardado en:
Publicado: |
1998
|
---|---|
Materias: | |
Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v142_n_p143_Ramos http://hdl.handle.net/20.500.12110/paper_03058719_v142_n_p143_Ramos |
Aporte de: |
id |
paper:paper_03058719_v142_n_p143_Ramos |
---|---|
record_format |
dspace |
spelling |
paper:paper_03058719_v142_n_p143_Ramos2023-06-08T15:30:53Z Time constraints on the Early Palaeozoic docking of the Precordillera, central Argentina 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. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v142_n_p143_Ramos 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 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. |
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 |
publishDate |
1998 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v142_n_p143_Ramos http://hdl.handle.net/20.500.12110/paper_03058719_v142_n_p143_Ramos |
_version_ |
1768543658695458816 |