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Abstract:

Summary. Palaeomagnetic data from 71 hand samples of igneous rocks of Late Ordovician age exposed in western Argentina (31.3°S, 69.4°W, Alcaparrosa Formation) are given. Stable remanent magnetization was isolated in the majority of samples; they yield a palaeomagnetic pole at 56°S 33°E (N= 8, α95= 16°). Whole rock K‐Ar age determinations yield an age of 416 ± 10 Myr for a pillow lava of the Alcaparrosa Formation. Palaeomagnetic data for South America, Africa, Australia, Antarctica and India suggest that Gondwana was a unit at least as far back as 1000 Myr. The palaeomagnetic data define a rapid polar migration for Gondwana in Ordovician time which is consistent with the widespread occurrences of Late Ordovician glacial deposits across this supercontinent. Copyright © 1978, Wiley Blackwell. All rights reserved

Registro:

Documento: Artículo
Título:Palaeomagnetism and K—Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina
Autor:Vilas, J.F.; Valencio, D.A.
Filiación:Depanamento de Ciencias Geológicas, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, Argentina
Año:1978
Volumen:55
Número:1
Página de inicio:143
Página de fin:154
DOI: http://dx.doi.org/10.1111/j.1365-246X.1978.tb04753.x
Título revista:Geophysical Journal of the Royal Astronomical Society
Título revista abreviado:Geophys. J. Int.
ISSN:00168009
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168009_v55_n1_p143_Vilas

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Citas:

---------- APA ----------
Vilas, J.F. & Valencio, D.A. (1978) . Palaeomagnetism and K—Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina. Geophysical Journal of the Royal Astronomical Society, 55(1), 143-154.
http://dx.doi.org/10.1111/j.1365-246X.1978.tb04753.x
---------- CHICAGO ----------
Vilas, J.F., Valencio, D.A. "Palaeomagnetism and K—Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina" . Geophysical Journal of the Royal Astronomical Society 55, no. 1 (1978) : 143-154.
http://dx.doi.org/10.1111/j.1365-246X.1978.tb04753.x
---------- MLA ----------
Vilas, J.F., Valencio, D.A. "Palaeomagnetism and K—Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina" . Geophysical Journal of the Royal Astronomical Society, vol. 55, no. 1, 1978, pp. 143-154.
http://dx.doi.org/10.1111/j.1365-246X.1978.tb04753.x
---------- VANCOUVER ----------
Vilas, J.F., Valencio, D.A. Palaeomagnetism and K—Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina. Geophys. J. Int. 1978;55(1):143-154.
http://dx.doi.org/10.1111/j.1365-246X.1978.tb04753.x