Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina

Summary. Stable components of magnetization have been isolated in 15 lava flows (mean K‐Ar age 123 ± 4 Myr) from the alkaline sequence outcropping at El Salto‐Almafuerte, Province of Cordoba, Argentina. Magnetic and geologic stratigraphy, as well as K‐Ar ages indicate that this sequence was probably...

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Autor principal: Mendía, J.E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00168009_v54_n3_p539_Mendia
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spelling todo:paper_00168009_v54_n3_p539_Mendia2023-10-03T14:14:50Z Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina Mendía, J.E. Summary. Stable components of magnetization have been isolated in 15 lava flows (mean K‐Ar age 123 ± 4 Myr) from the alkaline sequence outcropping at El Salto‐Almafuerte, Province of Cordoba, Argentina. Magnetic and geologic stratigraphy, as well as K‐Ar ages indicate that this sequence was probably extruded in the Lower Cretaceous during the first volcanic cycle of the Sierra de los Cóndores Group (Vulcanitas Cerro Colorado Formation). The palaeomagnetic pole‐position for El Salto‐Almafuerte lava flows, computed from the mean of 15 virtual geomagnetic poles and denoted SAK7, is: 25° E, 72° S (k= 35, α95= 6.5°); it is fairly close to other Lower Cretaceous palaeomagnetic poles for South America. The elongated distribution of Cretaceous palaeomagnetic poles suggest recurrent drift for South America in early Cretaceous time. The palaeomagnetic and radiometric data for the igneous rocks from El Salto‐Almafuerte support the magnetic reversal time‐scale for the early Cretaceous suggested by oceanic magnetic lineations. Copyright © 1978, Wiley Blackwell. All rights reserved Fil:Mendía, J.E. 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_v54_n3_p539_Mendia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Summary. Stable components of magnetization have been isolated in 15 lava flows (mean K‐Ar age 123 ± 4 Myr) from the alkaline sequence outcropping at El Salto‐Almafuerte, Province of Cordoba, Argentina. Magnetic and geologic stratigraphy, as well as K‐Ar ages indicate that this sequence was probably extruded in the Lower Cretaceous during the first volcanic cycle of the Sierra de los Cóndores Group (Vulcanitas Cerro Colorado Formation). The palaeomagnetic pole‐position for El Salto‐Almafuerte lava flows, computed from the mean of 15 virtual geomagnetic poles and denoted SAK7, is: 25° E, 72° S (k= 35, α95= 6.5°); it is fairly close to other Lower Cretaceous palaeomagnetic poles for South America. The elongated distribution of Cretaceous palaeomagnetic poles suggest recurrent drift for South America in early Cretaceous time. The palaeomagnetic and radiometric data for the igneous rocks from El Salto‐Almafuerte support the magnetic reversal time‐scale for the early Cretaceous suggested by oceanic magnetic lineations. Copyright © 1978, Wiley Blackwell. All rights reserved
format JOUR
author Mendía, J.E.
spellingShingle Mendía, J.E.
Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
author_facet Mendía, J.E.
author_sort Mendía, J.E.
title Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
title_short Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
title_full Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
title_fullStr Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
title_full_unstemmed Palaeomagnetism of alkaline lava flows from El Salto‐Almafuerte, Córdoba Province, Argentina
title_sort palaeomagnetism of alkaline lava flows from el salto‐almafuerte, córdoba province, argentina
url http://hdl.handle.net/20.500.12110/paper_00168009_v54_n3_p539_Mendia
work_keys_str_mv AT mendiaje palaeomagnetismofalkalinelavaflowsfromelsaltoalmafuertecordobaprovinceargentina
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