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, C.M., Rapalini, A.E., Astini, R.A.
Formato: JOUR
Materias:
Gondwana
Northwestern Argentina
Paleomagnetism
Paleozoic
Pampia
Acceso en línea: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 todo:paper_1342937X_v21_n2-3_p406_Spagnuolo
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spelling todo:paper_1342937X_v21_n2-3_p406_Spagnuolo2023-10-03T16:09:34Z Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking? Spagnuolo, C.M. Rapalini, A.E. Astini, R.A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, C.M.
Rapalini, A.E.
Astini, R.A.
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.
format JOUR
author Spagnuolo, C.M.
Rapalini, A.E.
Astini, R.A.
author_facet Spagnuolo, C.M.
Rapalini, A.E.
Astini, R.A.
author_sort Spagnuolo, C.M.
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?
url http://hdl.handle.net/20.500.12110/paper_1342937X_v21_n2-3_p406_Spagnuolo
work_keys_str_mv AT spagnuolocm assemblyofpampiatotheswgondwanamarginacaseofstrikeslipdocking
AT rapaliniae assemblyofpampiatotheswgondwanamarginacaseofstrikeslipdocking
AT astinira assemblyofpampiatotheswgondwanamarginacaseofstrikeslipdocking
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