Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina

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Palaeomagnetic data from samples collected in a rock sequence of tuffs and shales (Suri Formation), exposed in northwestern Argentina, indicate that the geomagnetic field had reversed polarity in Llanvirnian time. The samples from the top of the sequence also record, at least, an excursion of the ge...

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Autor principal: Valencio, D.A.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00221392_v32_n_pSIII71_Valencio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00221392_v32_n_pSIII71_Valencio
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spelling todo:paper_00221392_v32_n_pSIII71_Valencio2023-10-03T14:27:31Z Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina Valencio, D.A. Palaeomagnetic data from samples collected in a rock sequence of tuffs and shales (Suri Formation), exposed in northwestern Argentina, indicate that the geomagnetic field had reversed polarity in Llanvirnian time. The samples from the top of the sequence also record, at least, an excursion of the geomagnetic field. The palaeomagnetic study carried out on samples collected in a rock sequence of shallow marine sediments of Late Precambrian age (La Tinta Formation), exposed in central-eastern Argentina, indicates that the geomagnetic field had alternating periods of normal and reversed polarity in that geological time. The positions of the palaeomagnetic poles for the Suri and La Tinta Formations are consistent with the interpretation that Gondwana was a unit as far back as Late Precambrian and with the occurrences of Upper Ordovician and Upper Precambrian glacial deposits across Africa and Australia, respectively. They do not, however, exclude models involving the opening and closing of minor seas. Particularly, the position of La Tinta pole is consistent with the interpretation which suggests that the sediments of this formation and those of the Nama Group (Africa) were deposited in a common shallow marine basin. © 1980, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00221392_v32_n_pSIII71_Valencio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Palaeomagnetic data from samples collected in a rock sequence of tuffs and shales (Suri Formation), exposed in northwestern Argentina, indicate that the geomagnetic field had reversed polarity in Llanvirnian time. The samples from the top of the sequence also record, at least, an excursion of the geomagnetic field. The palaeomagnetic study carried out on samples collected in a rock sequence of shallow marine sediments of Late Precambrian age (La Tinta Formation), exposed in central-eastern Argentina, indicates that the geomagnetic field had alternating periods of normal and reversed polarity in that geological time. The positions of the palaeomagnetic poles for the Suri and La Tinta Formations are consistent with the interpretation that Gondwana was a unit as far back as Late Precambrian and with the occurrences of Upper Ordovician and Upper Precambrian glacial deposits across Africa and Australia, respectively. They do not, however, exclude models involving the opening and closing of minor seas. Particularly, the position of La Tinta pole is consistent with the interpretation which suggests that the sediments of this formation and those of the Nama Group (Africa) were deposited in a common shallow marine basin. © 1980, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
format JOUR
author Valencio, D.A.
spellingShingle Valencio, D.A.
Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
author_facet Valencio, D.A.
author_sort Valencio, D.A.
title Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
title_short Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
title_full Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
title_fullStr Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
title_full_unstemmed Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
title_sort palaeomagnetism of lower ordovician and upper precambrian rocks from argentina
url http://hdl.handle.net/20.500.12110/paper_00221392_v32_n_pSIII71_Valencio
work_keys_str_mv AT valencioda palaeomagnetismoflowerordovicianandupperprecambrianrocksfromargentina
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