Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America

A thorough palaeomagnetic study in four marine sedimentary sections from the Neuquén Basin in west-central Argentina was carried out. Sections are several hundreds meters-thick and consist of ammonite-bearing beds with intercalated volcanics. Two magnetic components carried by titanomagnetites were...

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Autores principales: Iglesia Llanos, María Paula, Riccardi, Alberto Carlos, Singer, Silvia Elisabet
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Naturales
Jurassic
palaeomagnetism
Neuquén
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/153011
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-153011
record_format dspace
spelling I19-R120-10915-1530112023-05-16T04:08:01Z http://sedici.unlp.edu.ar/handle/10915/153011 issn:0012-821X Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America Iglesia Llanos, María Paula Riccardi, Alberto Carlos Singer, Silvia Elisabet 2006 2023-05-15T17:22:47Z en Ciencias Naturales Jurassic palaeomagnetism Neuquén Argentina A thorough palaeomagnetic study in four marine sedimentary sections from the Neuquén Basin in west-central Argentina was carried out. Sections are several hundreds meters-thick and consist of ammonite-bearing beds with intercalated volcanics. Two magnetic components carried by titanomagnetites were identified in the studied sections, one soft corresponding most likely to a present-day remagnetisation and a harder one which is interpreted as the primary magnetisation of the sections, based on optical studies and the results of field tests of palaeomagnetic stability, bearing an Early Jurassic age. As a result, two new palaeomagnetic poles for stable South America are presented: one for the Hettangian–Sinemurian located at 223° E, 51° S, A95=6°, N=25, and the other for the Pliensbachian–Toarcian located at 67° E, 74° S, A95=5°, N=52. These and other poles from the literature were used in this study to construct a refined Late Triassic to Jurassic APW path for stable South America, which differs significantly from previous models in showing a cusp between the Sinemurian and the Pliensbachian, indicative of large apparent polar wander. The same feature is observed in other continents of Pangea, like Eurasia. Palaeolatitudes of the Neuquén Basin indicate that South America was subject to considerable N–S movements during the Late Triassic and lowermost Early Jurassic. These latitudinal movements of Pangea are consistent with displacements recorded for marine faunas from South America and Eurasia. Facultad de Ciencias Naturales y Museo Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 379-397
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Jurassic
palaeomagnetism
Neuquén
Argentina
spellingShingle Ciencias Naturales
Jurassic
palaeomagnetism
Neuquén
Argentina
Iglesia Llanos, María Paula
Riccardi, Alberto Carlos
Singer, Silvia Elisabet
Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
topic_facet Ciencias Naturales
Jurassic
palaeomagnetism
Neuquén
Argentina
description A thorough palaeomagnetic study in four marine sedimentary sections from the Neuquén Basin in west-central Argentina was carried out. Sections are several hundreds meters-thick and consist of ammonite-bearing beds with intercalated volcanics. Two magnetic components carried by titanomagnetites were identified in the studied sections, one soft corresponding most likely to a present-day remagnetisation and a harder one which is interpreted as the primary magnetisation of the sections, based on optical studies and the results of field tests of palaeomagnetic stability, bearing an Early Jurassic age. As a result, two new palaeomagnetic poles for stable South America are presented: one for the Hettangian–Sinemurian located at 223° E, 51° S, A95=6°, N=25, and the other for the Pliensbachian–Toarcian located at 67° E, 74° S, A95=5°, N=52. These and other poles from the literature were used in this study to construct a refined Late Triassic to Jurassic APW path for stable South America, which differs significantly from previous models in showing a cusp between the Sinemurian and the Pliensbachian, indicative of large apparent polar wander. The same feature is observed in other continents of Pangea, like Eurasia. Palaeolatitudes of the Neuquén Basin indicate that South America was subject to considerable N–S movements during the Late Triassic and lowermost Early Jurassic. These latitudinal movements of Pangea are consistent with displacements recorded for marine faunas from South America and Eurasia.
format Articulo
Articulo
author Iglesia Llanos, María Paula
Riccardi, Alberto Carlos
Singer, Silvia Elisabet
author_facet Iglesia Llanos, María Paula
Riccardi, Alberto Carlos
Singer, Silvia Elisabet
author_sort Iglesia Llanos, María Paula
title Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
title_short Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
title_full Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
title_fullStr Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
title_full_unstemmed Palaeomagnetic study of Lower Jurassic marine strata from the Neuquén Basin, Argentina: A new Jurassic apparent polar wander path for South America
title_sort palaeomagnetic study of lower jurassic marine strata from the neuquén basin, argentina: a new jurassic apparent polar wander path for south america
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/153011
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