Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane

A magnetofabric and paleomagnetic study was carried out in the Late Ediacaran - Early Cambrian Puncoviscana and the early Late Cambrian Campanario formations, exposed in Santa Victoria Oeste, in northwestern Argentina. Ten sites (93 samples) were located in tuffs and volcanic sills interbedded in th...

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Autores principales: Franceschinis, P.R., Rapalini, A.E., Escayola, M.P., Luppo, T.
Formato: JOUR
Materias:
Campanario formation
Gondwana
Paleomagnetism
Pampia
Puncoviscana formation
Cambrian
continental margin
displacement
Ediacaran
geological record
magnetic fabric
Ordovician
paleogeography
paleomagnetism
polar wandering
tectonic rotation
Argentina
Rio de la Plata
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v70_n_p145_Franceschinis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v70_n_p145_Franceschinis2023-10-03T15:43:22Z Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane Franceschinis, P.R. Rapalini, A.E. Escayola, M.P. Luppo, T. Campanario formation Gondwana Paleomagnetism Pampia Puncoviscana formation Cambrian continental margin displacement Ediacaran geological record Gondwana magnetic fabric Ordovician paleogeography paleomagnetism polar wandering tectonic rotation Argentina Rio de la Plata A magnetofabric and paleomagnetic study was carried out in the Late Ediacaran - Early Cambrian Puncoviscana and the early Late Cambrian Campanario formations, exposed in Santa Victoria Oeste, in northwestern Argentina. Ten sites (93 samples) were located in tuffs and volcanic sills interbedded in the Puncoviscana Formation, one of which had been dated at 537 ± 0.9 Ma. On the other hand, 42 samples were collected at three sites from red to purple sandstones of the Campanario Formation. The analysis of anisotropy of magnetic susceptibility (AMS) allowed to recognize a pre-Andean fabric in both formations indicating that it is previous to the Andean cycle. In the paleomagnetic study reliable magnetic components were isolated in only two sites of the Puncoviscana formation whose virtual geomagnetic poles (VGPs) are close to but do not coincide with the apparent polar wander path of Río de la Plata craton - Gondwana for the late Neoproterozoic - Cambrian. A new paleomagnetic pole (18.2°S, 358.8°W, K: 27.9; A95: 3.9) was computed for the Campanario formation which is close to but does not coincide with those obtained in other locations for this unit and were considered anomalous respect to the expected position in the Gondwana path. The pole presented here is closer to the apparent polar wander path of Gondwana for the Late Cambrian-Early Ordovician suggesting two possible interpretations; the presence of different amounts of Andean tectonic rotations between different sampling locations of the Campanario Formation or the recording of a rapid Pampia dextral displacement along the Rio de la Plata craton margin in Cambrian times. © 2016 Elsevier Ltd. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Escayola, M.P. 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_08959811_v70_n_p145_Franceschinis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Campanario formation
Gondwana
Paleomagnetism
Pampia
Puncoviscana formation
Cambrian
continental margin
displacement
Ediacaran
geological record
Gondwana
magnetic fabric
Ordovician
paleogeography
paleomagnetism
polar wandering
tectonic rotation
Argentina
Rio de la Plata
spellingShingle Campanario formation
Gondwana
Paleomagnetism
Pampia
Puncoviscana formation
Cambrian
continental margin
displacement
Ediacaran
geological record
Gondwana
magnetic fabric
Ordovician
paleogeography
paleomagnetism
polar wandering
tectonic rotation
Argentina
Rio de la Plata
Franceschinis, P.R.
Rapalini, A.E.
Escayola, M.P.
Luppo, T.
Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
topic_facet Campanario formation
Gondwana
Paleomagnetism
Pampia
Puncoviscana formation
Cambrian
continental margin
displacement
Ediacaran
geological record
Gondwana
magnetic fabric
Ordovician
paleogeography
paleomagnetism
polar wandering
tectonic rotation
Argentina
Rio de la Plata
description A magnetofabric and paleomagnetic study was carried out in the Late Ediacaran - Early Cambrian Puncoviscana and the early Late Cambrian Campanario formations, exposed in Santa Victoria Oeste, in northwestern Argentina. Ten sites (93 samples) were located in tuffs and volcanic sills interbedded in the Puncoviscana Formation, one of which had been dated at 537 ± 0.9 Ma. On the other hand, 42 samples were collected at three sites from red to purple sandstones of the Campanario Formation. The analysis of anisotropy of magnetic susceptibility (AMS) allowed to recognize a pre-Andean fabric in both formations indicating that it is previous to the Andean cycle. In the paleomagnetic study reliable magnetic components were isolated in only two sites of the Puncoviscana formation whose virtual geomagnetic poles (VGPs) are close to but do not coincide with the apparent polar wander path of Río de la Plata craton - Gondwana for the late Neoproterozoic - Cambrian. A new paleomagnetic pole (18.2°S, 358.8°W, K: 27.9; A95: 3.9) was computed for the Campanario formation which is close to but does not coincide with those obtained in other locations for this unit and were considered anomalous respect to the expected position in the Gondwana path. The pole presented here is closer to the apparent polar wander path of Gondwana for the Late Cambrian-Early Ordovician suggesting two possible interpretations; the presence of different amounts of Andean tectonic rotations between different sampling locations of the Campanario Formation or the recording of a rapid Pampia dextral displacement along the Rio de la Plata craton margin in Cambrian times. © 2016 Elsevier Ltd.
format JOUR
author Franceschinis, P.R.
Rapalini, A.E.
Escayola, M.P.
Luppo, T.
author_facet Franceschinis, P.R.
Rapalini, A.E.
Escayola, M.P.
Luppo, T.
author_sort Franceschinis, P.R.
title Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
title_short Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
title_full Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
title_fullStr Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
title_full_unstemmed Paleomagnetic studies on the late Ediacaran - Early Cambrian Puncoviscana and the late Cambrian Campanario formations, NW Argentina: New paleogeographic constraints for the Pampia terrane
title_sort paleomagnetic studies on the late ediacaran - early cambrian puncoviscana and the late cambrian campanario formations, nw argentina: new paleogeographic constraints for the pampia terrane
url http://hdl.handle.net/20.500.12110/paper_08959811_v70_n_p145_Franceschinis
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AT rapaliniae paleomagneticstudiesonthelateediacaranearlycambrianpuncoviscanaandthelatecambriancampanarioformationsnwargentinanewpaleogeographicconstraintsforthepampiaterrane
AT escayolamp paleomagneticstudiesonthelateediacaranearlycambrianpuncoviscanaandthelatecambriancampanarioformationsnwargentinanewpaleogeographicconstraintsforthepampiaterrane
AT luppot paleomagneticstudiesonthelateediacaranearlycambrianpuncoviscanaandthelatecambriancampanarioformationsnwargentinanewpaleogeographicconstraintsforthepampiaterrane
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