Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera

Several recent tectonic models have portrayed the Argentine Precordillera has been recently portrayed as an Early Paleozoic Laurentian derived exotic terrane now found in southwestern South America. These models have primarily been based on strong biogeographic and stratigraphic evidence, however, n...

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Detalles Bibliográficos
Autores principales:	Rapalini, A.E., Astini, R.A.
Formato:	JOUR
Materias:	Argentina Gondwana Laurentia Paleomagnetism Paleozoic Precordillera palaeomagnetism Palaeozoic
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0012821X_v155_n1-2_p1_Rapalini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_0012821X_v155_n1-2_p1_Rapalini2023-10-03T14:10:26Z Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera Rapalini, A.E. Astini, R.A. Argentina Gondwana Laurentia Paleomagnetism Paleozoic Precordillera Gondwana Laurentia palaeomagnetism Palaeozoic Argentina Several recent tectonic models have portrayed the Argentine Precordillera has been recently portrayed as an Early Paleozoic Laurentian derived exotic terrane now found in southwestern South America. These models have primarily been based on strong biogeographic and stratigraphic evidence, however, no paleomagnetic data have previously been available to independently test them. A paleomagnetic study was, therefore, carried out on the Early Cambrian Cerro Totora Formation, exposed in the northern reaches of the Argentine Precordillera. After stepwise thermal demagnetization a pre-folding remanence was identified in ten sites of this formation, yielding a paleomagnetic pole (CT) at 37.0°N, 314.1°E, A95 = 5.8°. This pole is not consistent with the latest Proterozoic-Early Paleozoic apparent polar wander path for Gondwana, but it agrees with the Early Cambrian Section of the Laurentian path if the Argentine Precordillera is positioned as the conjugate margin of the Ouachita embayment in southeast Laurentia. This result confirms that the Precordillera is an allochthonous terrane derived from Laurentia in Cambrian times, that was later accreted to Gondwana, probably in Middle Ordovician times. © 1998 Elsevier Science B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0012821X_v155_n1-2_p1_Rapalini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Gondwana Laurentia Paleomagnetism Paleozoic Precordillera Gondwana Laurentia palaeomagnetism Palaeozoic Argentina
spellingShingle	Argentina Gondwana Laurentia Paleomagnetism Paleozoic Precordillera Gondwana Laurentia palaeomagnetism Palaeozoic Argentina Rapalini, A.E. Astini, R.A. Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
topic_facet	Argentina Gondwana Laurentia Paleomagnetism Paleozoic Precordillera Gondwana Laurentia palaeomagnetism Palaeozoic Argentina
description	Several recent tectonic models have portrayed the Argentine Precordillera has been recently portrayed as an Early Paleozoic Laurentian derived exotic terrane now found in southwestern South America. These models have primarily been based on strong biogeographic and stratigraphic evidence, however, no paleomagnetic data have previously been available to independently test them. A paleomagnetic study was, therefore, carried out on the Early Cambrian Cerro Totora Formation, exposed in the northern reaches of the Argentine Precordillera. After stepwise thermal demagnetization a pre-folding remanence was identified in ten sites of this formation, yielding a paleomagnetic pole (CT) at 37.0°N, 314.1°E, A95 = 5.8°. This pole is not consistent with the latest Proterozoic-Early Paleozoic apparent polar wander path for Gondwana, but it agrees with the Early Cambrian Section of the Laurentian path if the Argentine Precordillera is positioned as the conjugate margin of the Ouachita embayment in southeast Laurentia. This result confirms that the Precordillera is an allochthonous terrane derived from Laurentia in Cambrian times, that was later accreted to Gondwana, probably in Middle Ordovician times. © 1998 Elsevier Science B.V.
format	JOUR
author	Rapalini, A.E. Astini, R.A.
author_facet	Rapalini, A.E. Astini, R.A.
author_sort	Rapalini, A.E.
title	Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
title_short	Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
title_full	Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
title_fullStr	Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
title_full_unstemmed	Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera
title_sort	paleomagnetic confirmation of the laurentian origin of the argentine precordillera
url	http://hdl.handle.net/20.500.12110/paper_0012821X_v155_n1-2_p1_Rapalini
work_keys_str_mv	AT rapaliniae paleomagneticconfirmationofthelaurentianoriginoftheargentineprecordillera AT astinira paleomagneticconfirmationofthelaurentianoriginoftheargentineprecordillera
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Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera

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