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Abstract:

A paleomagnetic study in Jurassic and Cretaceous rocks from the Canadon Asfalto basin, central Patagonia, indicates the occurrence of about 25-30°clockwise rotation in Upper Jurassic-lowermost Cretaceous rocks, whereas the overlying mid-Cretaceous rocks do not show evidence of rotation. This constrains the tectonic rotation to be related to a major regional unconformity in Patagonia, which in turn seems to be close in time with the early opening of the South Atlantic Ocean. The sense and probably the timing of this rotation are similar to those of other paleomagnetically detected rotations in different areas of southwestern Gondwana, suggesting a possible relationship between these and major tectonic processes related with fragmentation of the supercontinent. On the other hand, the mid-Cretaceous rocks in the region yield a paleopole located at Lat. 87°South, Long. 159°East, A95 = 3.8°. This pole position is consistent with coeval high-quality paleopoles of other plates when transferred to South American coordinates, implying it is an accurate determination of the Aptian (circa 116 Ma) geomagnetic field in South America. (C) 2000 Elsevier Science B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
Autor:Geuna, S.E.; Somoza, R.; Vizán, H.; Figari, E.G.; Rinaldi, C.A.
Filiación:Departamento de Ciencias Geológicas, FCEyN, Ciudad Universitaria, 1428 Buenos Aires, Argentina
REPSOL-YPF, Departamento de Reservorios-Exploración, División Regional sur, Buenos Aires, Argentina
Instituto Antártico Argentino, Cerrito 1248, 1010 Buenos Aires, Argentina
Palabras clave:Gondwana; Mesozoic; Paleomagnetism; Patagonia; Tectonics; continental breakup; Cretaceous; Gondwana; Jurassic; paleomagnetism; supercontinent; tectonic rotation; South America
Año:2000
Volumen:181
Número:1-2
Página de inicio:145
Página de fin:160
DOI: http://dx.doi.org/10.1016/S0012-821X(00)00198-9
Título revista:Earth and Planetary Science Letters
Título revista abreviado:Earth Plan. Sci. Lett.
ISSN:0012821X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v181_n1-2_p145_Geuna

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Citas:

---------- APA ----------
Geuna, S.E., Somoza, R., Vizán, H., Figari, E.G. & Rinaldi, C.A. (2000) . Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?. Earth and Planetary Science Letters, 181(1-2), 145-160.
http://dx.doi.org/10.1016/S0012-821X(00)00198-9
---------- CHICAGO ----------
Geuna, S.E., Somoza, R., Vizán, H., Figari, E.G., Rinaldi, C.A. "Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?" . Earth and Planetary Science Letters 181, no. 1-2 (2000) : 145-160.
http://dx.doi.org/10.1016/S0012-821X(00)00198-9
---------- MLA ----------
Geuna, S.E., Somoza, R., Vizán, H., Figari, E.G., Rinaldi, C.A. "Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?" . Earth and Planetary Science Letters, vol. 181, no. 1-2, 2000, pp. 145-160.
http://dx.doi.org/10.1016/S0012-821X(00)00198-9
---------- VANCOUVER ----------
Geuna, S.E., Somoza, R., Vizán, H., Figari, E.G., Rinaldi, C.A. Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?. Earth Plan. Sci. Lett. 2000;181(1-2):145-160.
http://dx.doi.org/10.1016/S0012-821X(00)00198-9