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Abstract:

Summary. In this paper we show that: (1) The positions of the Cretaceous palaeomagnetic poles (PP) for South America and Africa exhibit elongated distributions that are due to rapid movement of these continents from the south pole. (2) The positions of the Middle—late Jurassic virtual geomagnetic poles for South America exhibit an elongated distribution along the meridians 20–200° E; it is suggested that this is due to a rapid shift of South America in Middle—late Jurassic time. (3) The late early—early late Cretaceous sections of the apparent polar wandering paths for South America and Africa are consistent with South Atlantic seafloor spreading data. On the basis of the comparison of the reliable late Palaeozoic—late Cretaceous PPs for South America and Africa, taking into account the restrictions established by geological, palaeontological and seafloor spreading data, it is suggested that minor movements could have occurred within Western Gondwana in middle—late Jurassic time along a narrow zone which later became the South Atlantic divergent boundary. Four ‘hairpins’ are defined in the late Palaeozoic—late Cretaceous section of the apparent polar wandering path for South America; the two youngest of these can be correlated with the origin of the South Atlantic Ocean basin and the onset of the Andean Orogeny, respectively. The magnetostratigraphy for the Serra Geral lava flow sequence suggests that some of these flows were poured out rapidly without significant interruption. Copyright © 1983, Wiley Blackwell. All rights reserved

Registro:

Documento: Artículo
Título:The significance of the pdaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy
Autor:Valencio, D.A.; Vilas, J.F.; PaCCa, I.G.
Filiación:Departamento de Ciencias Geológicas, Ciudad Universitaria, Pabellón 2, Buenos Aires, 1428, Argentina
Instituto Astronómico E Geofísico, Universidade de São Paulo, Brazil
Consejo Nacional de Investigaciones Cientificas y Técnicas, Argentina
Año:1983
Volumen:73
Número:1
Página de inicio:135
Página de fin:151
DOI: http://dx.doi.org/10.1111/j.1365-246X.1983.tb03811.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_v73_n1_p135_Valencio

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Citas:

---------- APA ----------
Valencio, D.A., Vilas, J.F. & PaCCa, I.G. (1983) . The significance of the pdaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy. Geophysical Journal of the Royal Astronomical Society, 73(1), 135-151.
http://dx.doi.org/10.1111/j.1365-246X.1983.tb03811.x
---------- CHICAGO ----------
Valencio, D.A., Vilas, J.F., PaCCa, I.G. "The significance of the pdaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy" . Geophysical Journal of the Royal Astronomical Society 73, no. 1 (1983) : 135-151.
http://dx.doi.org/10.1111/j.1365-246X.1983.tb03811.x
---------- MLA ----------
Valencio, D.A., Vilas, J.F., PaCCa, I.G. "The significance of the pdaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy" . Geophysical Journal of the Royal Astronomical Society, vol. 73, no. 1, 1983, pp. 135-151.
http://dx.doi.org/10.1111/j.1365-246X.1983.tb03811.x
---------- VANCOUVER ----------
Valencio, D.A., Vilas, J.F., PaCCa, I.G. The significance of the pdaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy. Geophys. J. Int. 1983;73(1):135-151.
http://dx.doi.org/10.1111/j.1365-246X.1983.tb03811.x