Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?

Different hypotheses have been proposed to account for the geologic evolution of the southwestern margin of Gondwana in the Early Paleozoic, involving accretion and displacement of different terranes in a protracted convergent margin. In order to constrain and understand the kinematic and paleogeogr...

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Autores principales: Spagnuolo, Cecilia Mariel, Rapalini, Augusto Ernesto
Publicado: 2012
Materias:
Gondwana
Northwestern Argentina
Paleomagnetism
Paleozoic
Pampia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v21_n2-3_p406_Spagnuolo
http://hdl.handle.net/20.500.12110/paper_1342937X_v21_n2-3_p406_Spagnuolo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_1342937X_v21_n2-3_p406_Spagnuolo
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spelling paper:paper_1342937X_v21_n2-3_p406_Spagnuolo2025-07-30T18:46:19Z Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking? Spagnuolo, Cecilia Mariel Rapalini, Augusto Ernesto Gondwana Northwestern Argentina Paleomagnetism Paleozoic Pampia Different hypotheses have been proposed to account for the geologic evolution of the southwestern margin of Gondwana in the Early Paleozoic, involving accretion and displacement of different terranes in a protracted convergent margin. In order to constrain and understand the kinematic and paleogeographic evolution of the Pampia terrane a paleomagnetic study was carried out in different Cambrian to Devonian units of the Eastern Cordillera (Cordillera Oriental) and the Interandean Zone (Interandino) of NW Argentina. Paleomagnetic poles from the Campanario Formation (Middle to Upper Cambrian): 1.5°N 1.9°E A 95=9.2° K=37.46N=8; and Santa Rosita Formation (Lower Ordovician): 8.6°N 355.3°E A 95=10.1° K=26.78 n=9, representative of the Pampia terrane, are interpreted to indicate a Late Cambrian significant displacement with respect to the Río de la Plata and other Gondwana cratons. A model, compatible with several geological evidences that explains this displacement in the framework of the final stages of Gondwana assembly is presented. We propose a simple dextral strike-slip kinematic model in which Pampia and Antofalla (-Arequipa?) blocks moved during Late Cambrian times from a position at the present southern border of the Kalahari craton into its final position next to the Rio de la Plata craton by the Early Ordovician. © 2011 International Association for Gondwana Research. Fil:Spagnuolo, C.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v21_n2-3_p406_Spagnuolo http://hdl.handle.net/20.500.12110/paper_1342937X_v21_n2-3_p406_Spagnuolo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Gondwana
Northwestern Argentina
Paleomagnetism
Paleozoic
Pampia
spellingShingle Gondwana
Northwestern Argentina
Paleomagnetism
Paleozoic
Pampia
Spagnuolo, Cecilia Mariel
Rapalini, Augusto Ernesto
Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
topic_facet Gondwana
Northwestern Argentina
Paleomagnetism
Paleozoic
Pampia
description Different hypotheses have been proposed to account for the geologic evolution of the southwestern margin of Gondwana in the Early Paleozoic, involving accretion and displacement of different terranes in a protracted convergent margin. In order to constrain and understand the kinematic and paleogeographic evolution of the Pampia terrane a paleomagnetic study was carried out in different Cambrian to Devonian units of the Eastern Cordillera (Cordillera Oriental) and the Interandean Zone (Interandino) of NW Argentina. Paleomagnetic poles from the Campanario Formation (Middle to Upper Cambrian): 1.5°N 1.9°E A 95=9.2° K=37.46N=8; and Santa Rosita Formation (Lower Ordovician): 8.6°N 355.3°E A 95=10.1° K=26.78 n=9, representative of the Pampia terrane, are interpreted to indicate a Late Cambrian significant displacement with respect to the Río de la Plata and other Gondwana cratons. A model, compatible with several geological evidences that explains this displacement in the framework of the final stages of Gondwana assembly is presented. We propose a simple dextral strike-slip kinematic model in which Pampia and Antofalla (-Arequipa?) blocks moved during Late Cambrian times from a position at the present southern border of the Kalahari craton into its final position next to the Rio de la Plata craton by the Early Ordovician. © 2011 International Association for Gondwana Research.
author Spagnuolo, Cecilia Mariel
Rapalini, Augusto Ernesto
author_facet Spagnuolo, Cecilia Mariel
Rapalini, Augusto Ernesto
author_sort Spagnuolo, Cecilia Mariel
title Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
title_short Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
title_full Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
title_fullStr Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
title_full_unstemmed Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking?
title_sort assembly of pampia to the sw gondwana margin: a case of strike-slip docking?
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v21_n2-3_p406_Spagnuolo
http://hdl.handle.net/20.500.12110/paper_1342937X_v21_n2-3_p406_Spagnuolo
work_keys_str_mv AT spagnuoloceciliamariel assemblyofpampiatotheswgondwanamarginacaseofstrikeslipdocking
AT rapaliniaugustoernesto assemblyofpampiatotheswgondwanamarginacaseofstrikeslipdocking
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