Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina

New palaeomagnetic data for the Middle Jurassic Chon‐Aike Formation from 15 different geological units of rhyolitic porphyries, keratophyres, ignimbrites, pumicites and associated tuffs exposed at the Estancia La Reconquista, Province of Santa Cruz (48°10′S, 68°50′W), Argentina, are given. After cle...

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Autor principal: Vilas, J.F.A.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00168009_v39_n3_p511_Vilas
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00168009_v39_n3_p511_Vilas2023-10-03T14:14:48Z Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina Vilas, J.F.A. New palaeomagnetic data for the Middle Jurassic Chon‐Aike Formation from 15 different geological units of rhyolitic porphyries, keratophyres, ignimbrites, pumicites and associated tuffs exposed at the Estancia La Reconquista, Province of Santa Cruz (48°10′S, 68°50′W), Argentina, are given. After cleaning, all the units show normally polarized magnetic remanence and the mean of their virtual geomagnetic poles is not coincident with the mean of the virtual geomagnetic poles derived from the Puerto Deseado (Valencio & Vilas) and Camarones (Creer et al.) areas. It is proposed that the most reliable palaeomagnetic pole for the Chon‐Aike Formation is that given by the mean of the 54 virtual geomagnetic poles derived from all three areas, namely Puerto Deseado, Camarones and Estancia La Reconquista. It is situated at 85° S, 163° W, with α95= 6°. Comparison of the position of this palaeomagnetic pole with the mean of the African Jurassic palaeomagnetic poles suggests that the separation of South America and Africa occurred after the Middle Jurassic. Copyright © 1974, Wiley Blackwell. All rights reserved Fil:Vilas, J.F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00168009_v39_n3_p511_Vilas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description New palaeomagnetic data for the Middle Jurassic Chon‐Aike Formation from 15 different geological units of rhyolitic porphyries, keratophyres, ignimbrites, pumicites and associated tuffs exposed at the Estancia La Reconquista, Province of Santa Cruz (48°10′S, 68°50′W), Argentina, are given. After cleaning, all the units show normally polarized magnetic remanence and the mean of their virtual geomagnetic poles is not coincident with the mean of the virtual geomagnetic poles derived from the Puerto Deseado (Valencio & Vilas) and Camarones (Creer et al.) areas. It is proposed that the most reliable palaeomagnetic pole for the Chon‐Aike Formation is that given by the mean of the 54 virtual geomagnetic poles derived from all three areas, namely Puerto Deseado, Camarones and Estancia La Reconquista. It is situated at 85° S, 163° W, with α95= 6°. Comparison of the position of this palaeomagnetic pole with the mean of the African Jurassic palaeomagnetic poles suggests that the separation of South America and Africa occurred after the Middle Jurassic. Copyright © 1974, Wiley Blackwell. All rights reserved
format JOUR
author Vilas, J.F.A.
spellingShingle Vilas, J.F.A.
Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
author_facet Vilas, J.F.A.
author_sort Vilas, J.F.A.
title Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
title_short Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
title_full Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
title_fullStr Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
title_full_unstemmed Palaeomagnetism of Some Igneous Rocks of the Middle Jurassic Chon‐Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina
title_sort palaeomagnetism of some igneous rocks of the middle jurassic chon‐aike formation from estancia la reconquista, province of santa cruz, argentina
url http://hdl.handle.net/20.500.12110/paper_00168009_v39_n3_p511_Vilas
work_keys_str_mv AT vilasjfa palaeomagnetismofsomeigneousrocksofthemiddlejurassicchonaikeformationfromestancialareconquistaprovinceofsantacruzargentina
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