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Abstract:

The first paleomagnetic data from autochthonous Cambrian rocks in NW Argentina is reported to constrain the apparent polar wander path (APWP) of Gondwana during the Early Paleozoic. The paleomagnetic pole (Lat 4.5°S; Long 359.0°E; dp = 5.5; dm = 8.8; n = 26) was obtained from the red to purple sandstones of the Campanario Formation. These rocks present a characteristic remanence carried by fine-grained hematite. The pole indicates that during the Late Cambrian, rocks now exposed in the Eastern Cordillera of NW Argentina were deposited at relatively low latitudes (≈26°S), consistent with intense chemical alteration during wet and warm climates, as indicated from petrography of apparent first-cycle quarzites of the Mesón Group. However, the pole position is anomalous with respect to the most accepted apparent polar wander paths for Gondwana, suggesting that the study area (22°50′S, 65°00′W) underwent clockwise rotation of 38° ± 8°, likely related to the Cenozoic central Andes rotation pattern characteristic of the region. © 2007 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle-Late Cambrian Mesón Group: NW Argentina
Autor:Spagnuolo, C.M.; Rapalini, A.E.; Astini, R.A.
Filiación:INGEODAV, Depto.Cs.Geológicas, F.C.E.yN., Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Laboratorio de Análisis de Cuencas, Cátedra de Estratigrafía y Geología Histórica, F.C.E.F.yN., Av. Velez Sarsfield 1611, X5016GCA Córdoba, Argentina
Palabras clave:Cambrian; Gondwana; Northwestern Argentina; Orocline; Paleomagnetism; Cambrian; Gondwana; hematite; paleoclimate; paleogeography; paleomagnetism; petrography; quartzite; sandstone; tectonics; Argentina; South America
Año:2008
Volumen:25
Número:1
Página de inicio:86
Página de fin:99
DOI: http://dx.doi.org/10.1016/j.jsames.2007.08.004
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v25_n1_p86_Spagnuolo

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Citas:

---------- APA ----------
Spagnuolo, C.M., Rapalini, A.E. & Astini, R.A. (2008) . Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle-Late Cambrian Mesón Group: NW Argentina. Journal of South American Earth Sciences, 25(1), 86-99.
http://dx.doi.org/10.1016/j.jsames.2007.08.004
---------- CHICAGO ----------
Spagnuolo, C.M., Rapalini, A.E., Astini, R.A. "Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle-Late Cambrian Mesón Group: NW Argentina" . Journal of South American Earth Sciences 25, no. 1 (2008) : 86-99.
http://dx.doi.org/10.1016/j.jsames.2007.08.004
---------- MLA ----------
Spagnuolo, C.M., Rapalini, A.E., Astini, R.A. "Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle-Late Cambrian Mesón Group: NW Argentina" . Journal of South American Earth Sciences, vol. 25, no. 1, 2008, pp. 86-99.
http://dx.doi.org/10.1016/j.jsames.2007.08.004
---------- VANCOUVER ----------
Spagnuolo, C.M., Rapalini, A.E., Astini, R.A. Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle-Late Cambrian Mesón Group: NW Argentina. J. South Am. Earth Sci. 2008;25(1):86-99.
http://dx.doi.org/10.1016/j.jsames.2007.08.004