Palaeomagnetism of Lower Ordovician and Upper Precambrian rocks from Argentina.

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, Daniel Alberto
Publicado: 1981
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS01299_v_n_p71_Valencio
http://hdl.handle.net/20.500.12110/paper_NIS01299_v_n_p71_Valencio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_NIS01299_v_n_p71_Valencio2023-06-08T16:39:27Z Palaeomagnetism of Lower Ordovician and Upper Precambrian rocks from Argentina. Valencio, Daniel Alberto 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 depths 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. -Author Fil:Valencio, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1981 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS01299_v_n_p71_Valencio http://hdl.handle.net/20.500.12110/paper_NIS01299_v_n_p71_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 depths 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. -Author
author Valencio, Daniel Alberto
spellingShingle Valencio, Daniel Alberto
Palaeomagnetism of Lower Ordovician and Upper Precambrian rocks from Argentina.
author_facet Valencio, Daniel Alberto
author_sort Valencio, Daniel Alberto
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.
publishDate 1981
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS01299_v_n_p71_Valencio
http://hdl.handle.net/20.500.12110/paper_NIS01299_v_n_p71_Valencio
work_keys_str_mv AT valenciodanielalberto palaeomagnetismoflowerordovicianandupperprecambrianrocksfromargentina
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