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Abstract:

A paleomagnetic study of Eocene volcanic rocks in Patagonia yields high unblocking temperature and high-coercivity magnetizations. Combining these results with those of a previous study on Patagonian Eocene basalts yields a high-precision, high-quality pole located at latitude 81°S, longitude 337.4°E, A95 = 5.7°. Critically, this paleopole is indistinguishable from that of the Late Cretaceous (circa 85-65 Ma) pole position of South America, indicating that the plate was essentially motionless with respect to the spin axis for a period of ∼45 m.y. The pole position places South America at higher (∼5°) than present-day latitudes during the Eocene, indicating that northward continental motion toward present-day latitudes must have been accomplished sometime since the late Eocene. Paleomagnetic and tectonic correlation admits the hypothesis that Cenozoic northward drift was associated with Oligocene-Miocene extension in the southern continental edge, leading to the opening of the Drake Passage, and it agrees with the timing of foredeep formation and development of fold-thrust belts in the northern continental edge. This positive correlation between the paleomagnetically predicted drift of a major continent with extension at its trailing edge and convergence at its leading edge during times for which seafloor tectonic fabric and the geological record are particularly well preserved illustrates the utility of paleomagnetism in constraining paleogeographic and tectonic reconstructions for pre-Cretaceous times. Copyright 2007 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Eocene paleomagnetic pole for South America: Northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence
Autor:Somoza, R.
Filiación:CONICET, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón 2, C1428EHA Buenos Aires, Argentina
Palabras clave:Cenozoic; Cretaceous; Eocene; fold and thrust belt; forearc basin; magnetic fabric; magnetization; paleogeography; paleomagnetism; seafloor; tectonic reconstruction; volcanic rock; Drake Passage; South America
Año:2007
Volumen:112
Número:3
DOI: http://dx.doi.org/10.1029/2006JB004610
Título revista:Journal of Geophysical Research: Solid Earth
Título revista abreviado:J. Geophys. Res. B Solid Earth
ISSN:21699313
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v112_n3_p_Somoza

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Citas:

---------- APA ----------
(2007) . Eocene paleomagnetic pole for South America: Northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence. Journal of Geophysical Research: Solid Earth, 112(3).
http://dx.doi.org/10.1029/2006JB004610
---------- CHICAGO ----------
Somoza, R. "Eocene paleomagnetic pole for South America: Northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence" . Journal of Geophysical Research: Solid Earth 112, no. 3 (2007).
http://dx.doi.org/10.1029/2006JB004610
---------- MLA ----------
Somoza, R. "Eocene paleomagnetic pole for South America: Northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence" . Journal of Geophysical Research: Solid Earth, vol. 112, no. 3, 2007.
http://dx.doi.org/10.1029/2006JB004610
---------- VANCOUVER ----------
Somoza, R. Eocene paleomagnetic pole for South America: Northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence. J. Geophys. Res. B Solid Earth. 2007;112(3).
http://dx.doi.org/10.1029/2006JB004610