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Abstract:

A paleomagnetic pole and a new Ar-Ar date of 156.08 ± 0.05 Ma are reported for the Chon Aike Formation, an extensive plateau of ignimbrites, outcropping in the Deseado Massif (southern Patagonia, Argentina). The geographic coordinates and statistical parameters for the paleomagnetic pole, validated by a reversal test, are: Lat. = 84.3° S, Long. = 191.3° E, A95 = 8.6°, K = 13.3, N = 23. This pole shows a complete coherence with Late Jurassic and Early to mid-Cretaceous poles of South America, obtained exclusively from igneous rocks, avoiding any potential inclination shallowing. It is suggested that; a) southern Patagonia was an integral part of South America in the Late Jurassic; b) any reported vertical axis tectonic rotations must pre-date the Late Jurassic in this region; c) according to updated paleomagnetic data from igneous rocks, South America had very limited latitudinal drift between about 160 and 140 Ma; and, therefore, d) its apparent polar wander (APW) path, when compared with global apparent polar wander paths, does not support a large global shift or true polar wander (TPW) between 160 and 140 Ma. © 2018 Elsevier B.V.

Registro:

Documento: Artículo
Título:New paleomagnetic pole for the Upper Jurassic Chon Aike Formation of southern Argentina (South America): Testing the tectonic stability of Patagonia with respect to South America, and implications to Middle Jurassic-Early Cretaceous true polar wander
Autor:Ruiz González, V.; Puigdomenech, C.G.; Renda, E.M.; Boltshauser, B.; Somoza, R.; Vizán, H.; Zaffarana, C.B.; Taylor, G.K.; Haller, M.; Fernández, R.
Filiación:IGEBA, UBA – CONICET, Argentina
IIPG, UNRN – CONICET, Argentina
Plymouth University, United Kingdom
CENPAT, CONICET – UNPSJB, Argentina
INREMI, UNLP, Argentina
Palabras clave:Apparent polar wander path; Chon Aike Formation; Deseado Massif; Paleomagnetism; South America; Geomagnetism; Nitrogen compounds; Tectonics; Uranium compounds; Volcanic rocks; Apparent polar wander path; Chon Aike Formation; Deseado Massif; Paleomagnetism; South America; Sulfur compounds; apparent polar wander path; argon-argon dating; ignimbrite; Jurassic; outcrop; paleomagnetism; tectonic evolution; tectonic setting; Argentina; Patagonia
Año:2019
Volumen:750
Página de inicio:45
Página de fin:55
DOI: http://dx.doi.org/10.1016/j.tecto.2018.10.028
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_00401951_v750_n_p45_RuizGonzalez

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Citas:

---------- APA ----------
Ruiz González, V., Puigdomenech, C.G., Renda, E.M., Boltshauser, B., Somoza, R., Vizán, H., Zaffarana, C.B.,..., Fernández, R. (2019) . New paleomagnetic pole for the Upper Jurassic Chon Aike Formation of southern Argentina (South America): Testing the tectonic stability of Patagonia with respect to South America, and implications to Middle Jurassic-Early Cretaceous true polar wander. Tectonophysics, 750, 45-55.
http://dx.doi.org/10.1016/j.tecto.2018.10.028
---------- CHICAGO ----------
Ruiz González, V., Puigdomenech, C.G., Renda, E.M., Boltshauser, B., Somoza, R., Vizán, H., et al. "New paleomagnetic pole for the Upper Jurassic Chon Aike Formation of southern Argentina (South America): Testing the tectonic stability of Patagonia with respect to South America, and implications to Middle Jurassic-Early Cretaceous true polar wander" . Tectonophysics 750 (2019) : 45-55.
http://dx.doi.org/10.1016/j.tecto.2018.10.028
---------- MLA ----------
Ruiz González, V., Puigdomenech, C.G., Renda, E.M., Boltshauser, B., Somoza, R., Vizán, H., et al. "New paleomagnetic pole for the Upper Jurassic Chon Aike Formation of southern Argentina (South America): Testing the tectonic stability of Patagonia with respect to South America, and implications to Middle Jurassic-Early Cretaceous true polar wander" . Tectonophysics, vol. 750, 2019, pp. 45-55.
http://dx.doi.org/10.1016/j.tecto.2018.10.028
---------- VANCOUVER ----------
Ruiz González, V., Puigdomenech, C.G., Renda, E.M., Boltshauser, B., Somoza, R., Vizán, H., et al. New paleomagnetic pole for the Upper Jurassic Chon Aike Formation of southern Argentina (South America): Testing the tectonic stability of Patagonia with respect to South America, and implications to Middle Jurassic-Early Cretaceous true polar wander. Tectonophysics. 2019;750:45-55.
http://dx.doi.org/10.1016/j.tecto.2018.10.028