Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica

A new analysis of palaeomagnetic data for igneous rocks from Deception Island, 25 de Mayo Island (King George Island) and Cape Spring, are given. K-Ar age determinations indicate that most of the igneous samples from 25 de Mayo Island included in the palaeomagnetic study are of Late Mesozoic/Early T...

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Autores principales: Valencio, D.A., Mendía, JosE., Vilas, J.F.
Formato: JOUR
Materias:
Cape Spring
Deception Island
King George Island
oroclinal bending
polar movementigneous rocks
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0012821X_v45_n1_p61_Valencio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0012821X_v45_n1_p61_Valencio
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spelling todo:paper_0012821X_v45_n1_p61_Valencio2023-10-03T14:10:34Z Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica Valencio, D.A. Mendía, JosE. Vilas, J.F. Cape Spring Deception Island King George Island oroclinal bending polar movementigneous rocks A new analysis of palaeomagnetic data for igneous rocks from Deception Island, 25 de Mayo Island (King George Island) and Cape Spring, are given. K-Ar age determinations indicate that most of the igneous samples from 25 de Mayo Island included in the palaeomagnetic study are of Late Mesozoic/Early Tertiary age. The significance of these palaeomagnetic-radiometric data on the hypothesis of oroclinal bending of the Antarctic Peninsula and on the apparent polar movement of Antarctica is discussed. The positions of palaeomagnetic poles for the Andean igneous complex indicate that there has not been any apparent post-Late Cretaceous/Early Tertiary oroclinal bending in the Antarctic Peninsula from 74°S to 62°S. A comparison of the positions of palaeomagnetic poles for Antarctica and Australia suggests that the direction of apparent polar movement relative to Antarctica reversed after the Miocene. © 1979. Fil:Valencio, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mendía, JosE. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0012821X_v45_n1_p61_Valencio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cape Spring
Deception Island
King George Island
oroclinal bending
polar movementigneous rocks
spellingShingle Cape Spring
Deception Island
King George Island
oroclinal bending
polar movementigneous rocks
Valencio, D.A.
Mendía, JosE.
Vilas, J.F.
Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
topic_facet Cape Spring
Deception Island
King George Island
oroclinal bending
polar movementigneous rocks
description A new analysis of palaeomagnetic data for igneous rocks from Deception Island, 25 de Mayo Island (King George Island) and Cape Spring, are given. K-Ar age determinations indicate that most of the igneous samples from 25 de Mayo Island included in the palaeomagnetic study are of Late Mesozoic/Early Tertiary age. The significance of these palaeomagnetic-radiometric data on the hypothesis of oroclinal bending of the Antarctic Peninsula and on the apparent polar movement of Antarctica is discussed. The positions of palaeomagnetic poles for the Andean igneous complex indicate that there has not been any apparent post-Late Cretaceous/Early Tertiary oroclinal bending in the Antarctic Peninsula from 74°S to 62°S. A comparison of the positions of palaeomagnetic poles for Antarctica and Australia suggests that the direction of apparent polar movement relative to Antarctica reversed after the Miocene. © 1979.
format JOUR
author Valencio, D.A.
Mendía, JosE.
Vilas, J.F.
author_facet Valencio, D.A.
Mendía, JosE.
Vilas, J.F.
author_sort Valencio, D.A.
title Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
title_short Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
title_full Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
title_fullStr Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
title_full_unstemmed Palaeomagnetism and KAr age of Mesozoic and Cenozoic igneous rocks from Antarctica
title_sort palaeomagnetism and kar age of mesozoic and cenozoic igneous rocks from antarctica
url http://hdl.handle.net/20.500.12110/paper_0012821X_v45_n1_p61_Valencio
work_keys_str_mv AT valencioda palaeomagnetismandkarageofmesozoicandcenozoicigneousrocksfromantarctica
AT mendiajose palaeomagnetismandkarageofmesozoicandcenozoicigneousrocksfromantarctica
AT vilasjf palaeomagnetismandkarageofmesozoicandcenozoicigneousrocksfromantarctica
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