Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina

Palaeomagnetic data from 101 hand samples collected in a rock sequence of about 300m of red beds and igneous rocks of the La Colina Formation (Late Palaeozoic) and Amaná‐Talampaya Formation (Early Triassic) exposed in north‐western Argentina (30° S 67° W) are given. Samples were submitted to thermal...

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Autores principales: Sinito, Ana María, Valencio, Daniel Alberto, Vilas, Juan Francisco A.
Publicado: 1979
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168009_v58_n2_p237_Sinito
http://hdl.handle.net/20.500.12110/paper_00168009_v58_n2_p237_Sinito
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00168009_v58_n2_p237_Sinito
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spelling paper:paper_00168009_v58_n2_p237_Sinito2023-06-08T14:38:56Z Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina Sinito, Ana María Valencio, Daniel Alberto Vilas, Juan Francisco A. Palaeomagnetic data from 101 hand samples collected in a rock sequence of about 300m of red beds and igneous rocks of the La Colina Formation (Late Palaeozoic) and Amaná‐Talampaya Formation (Early Triassic) exposed in north‐western Argentina (30° S 67° W) are given. Samples were submitted to thermal, chemical and AC cleaning. After cleaning, the majority of La Colina Formation samples showed reversed polarity and yielded a palaeomagnetic pole at 49° S 343° E (α95=5°), which is consistent with the K‐Ar age (295 ± 5 Myr, Late Carboniferous) of a basaltic lava flow situated in the middle of La Colina rock succession. These rocks also recorded a normal polarity event (which we have correlated with the latest normal polarity event of the Debal'tseva Zone at the base of the Kiaman Magnetic Interval) and two excursions of the geomagnetic field. After treatment, the samples from the Amaná‐Talampaya Formation showed normal and reversed polarity and revealed frequent reversals and excursions of the geomagnetic field suggesting an Illawarra Zone age (post Kiaman, Late Tatarian‐Early Scyntian and younger). Copyright © 1979, Wiley Blackwell. All rights reserved Fil:Sinito, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Valencio, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilas, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1979 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168009_v58_n2_p237_Sinito http://hdl.handle.net/20.500.12110/paper_00168009_v58_n2_p237_Sinito
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 101 hand samples collected in a rock sequence of about 300m of red beds and igneous rocks of the La Colina Formation (Late Palaeozoic) and Amaná‐Talampaya Formation (Early Triassic) exposed in north‐western Argentina (30° S 67° W) are given. Samples were submitted to thermal, chemical and AC cleaning. After cleaning, the majority of La Colina Formation samples showed reversed polarity and yielded a palaeomagnetic pole at 49° S 343° E (α95=5°), which is consistent with the K‐Ar age (295 ± 5 Myr, Late Carboniferous) of a basaltic lava flow situated in the middle of La Colina rock succession. These rocks also recorded a normal polarity event (which we have correlated with the latest normal polarity event of the Debal'tseva Zone at the base of the Kiaman Magnetic Interval) and two excursions of the geomagnetic field. After treatment, the samples from the Amaná‐Talampaya Formation showed normal and reversed polarity and revealed frequent reversals and excursions of the geomagnetic field suggesting an Illawarra Zone age (post Kiaman, Late Tatarian‐Early Scyntian and younger). Copyright © 1979, Wiley Blackwell. All rights reserved
author Sinito, Ana María
Valencio, Daniel Alberto
Vilas, Juan Francisco A.
spellingShingle Sinito, Ana María
Valencio, Daniel Alberto
Vilas, Juan Francisco A.
Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
author_facet Sinito, Ana María
Valencio, Daniel Alberto
Vilas, Juan Francisco A.
author_sort Sinito, Ana María
title Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
title_short Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
title_full Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
title_fullStr Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
title_full_unstemmed Palaeomagnetism of a sequence of Upper Palaeozoic‐Lower Mesozoic red beds from Argentina
title_sort palaeomagnetism of a sequence of upper palaeozoic‐lower mesozoic red beds from argentina
publishDate 1979
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168009_v58_n2_p237_Sinito
http://hdl.handle.net/20.500.12110/paper_00168009_v58_n2_p237_Sinito
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AT valenciodanielalberto palaeomagnetismofasequenceofupperpalaeozoiclowermesozoicredbedsfromargentina
AT vilasjuanfranciscoa palaeomagnetismofasequenceofupperpalaeozoiclowermesozoicredbedsfromargentina
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