Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America

Further geological evidence and radiometric studies of South American igneous rocks suggest, (i) a Middle Permian age for geomagnetic poles until now quoted as Permo-Triassic or Lower Triassic, and (ii) a Middle-Upper Triassic age for a geomagnetic pole previously quoted either as Middle or Upper Tr...

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Autores principales: Valencio, Daniel Alberto, Vilas, Juan Francisco A.
Publicado: 1972
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v15_n1_p75_Valencio
http://hdl.handle.net/20.500.12110/paper_0012821X_v15_n1_p75_Valencio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0012821X_v15_n1_p75_Valencio
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spelling paper:paper_0012821X_v15_n1_p75_Valencio2023-06-08T14:35:27Z Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America Valencio, Daniel Alberto Vilas, Juan Francisco A. Further geological evidence and radiometric studies of South American igneous rocks suggest, (i) a Middle Permian age for geomagnetic poles until now quoted as Permo-Triassic or Lower Triassic, and (ii) a Middle-Upper Triassic age for a geomagnetic pole previously quoted either as Middle or Upper Triassic. The palaeomagnetic and radiometric data from igneous rocks of the Quebrada del Pimiento Formation of Argentina, define a period of normal polarity within the Late Palaeozoic Interval of reversed geomagnetic polarity (Kiaman Magnetic Interval); the possibility of using this short normal period for geological correlation is suggested. The Late Palaeozoic geomagnetic poles now available for South America define the polar path relative to this continent fairly well; it is suggested that this polar path is also valid for Africa, South America and Africa having been joined by their Atlantic margins throughout the Late Palaeozoic and Triassic. The discrepancy between the positions of Permian geomagnetic poles of South America and Australia is pointed out. It could represent different polar shifts relative to South America and Australia and could imply that the fragmentation of Gondwana started in Early Permian times with the formation of two super-continents: South America-Africa and Australia-Antarctica-India. © 1972. 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. 1972 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v15_n1_p75_Valencio http://hdl.handle.net/20.500.12110/paper_0012821X_v15_n1_p75_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 Further geological evidence and radiometric studies of South American igneous rocks suggest, (i) a Middle Permian age for geomagnetic poles until now quoted as Permo-Triassic or Lower Triassic, and (ii) a Middle-Upper Triassic age for a geomagnetic pole previously quoted either as Middle or Upper Triassic. The palaeomagnetic and radiometric data from igneous rocks of the Quebrada del Pimiento Formation of Argentina, define a period of normal polarity within the Late Palaeozoic Interval of reversed geomagnetic polarity (Kiaman Magnetic Interval); the possibility of using this short normal period for geological correlation is suggested. The Late Palaeozoic geomagnetic poles now available for South America define the polar path relative to this continent fairly well; it is suggested that this polar path is also valid for Africa, South America and Africa having been joined by their Atlantic margins throughout the Late Palaeozoic and Triassic. The discrepancy between the positions of Permian geomagnetic poles of South America and Australia is pointed out. It could represent different polar shifts relative to South America and Australia and could imply that the fragmentation of Gondwana started in Early Permian times with the formation of two super-continents: South America-Africa and Australia-Antarctica-India. © 1972.
author Valencio, Daniel Alberto
Vilas, Juan Francisco A.
spellingShingle Valencio, Daniel Alberto
Vilas, Juan Francisco A.
Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
author_facet Valencio, Daniel Alberto
Vilas, Juan Francisco A.
author_sort Valencio, Daniel Alberto
title Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
title_short Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
title_full Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
title_fullStr Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
title_full_unstemmed Palaeomagnetism of Late Palaeozoic and Early Mesozoic rocks of South America
title_sort palaeomagnetism of late palaeozoic and early mesozoic rocks of south america
publishDate 1972
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v15_n1_p75_Valencio
http://hdl.handle.net/20.500.12110/paper_0012821X_v15_n1_p75_Valencio
work_keys_str_mv AT valenciodanielalberto palaeomagnetismoflatepalaeozoicandearlymesozoicrocksofsouthamerica
AT vilasjuanfranciscoa palaeomagnetismoflatepalaeozoicandearlymesozoicrocksofsouthamerica
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