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Abstract:

The red bed succession cropping out in the Quebrada Santo Domingo in northwestern Argentina had been for long considered as Upper Triassic-Lower Jurassic in age based on weak radiometric and paleontological evidence. Preliminary paleomagnetic data confirmed the age and opened questions about the nature of fossil footprints with avian features discovered in the section. Recently the stratigraphic scheme was reviewed with the identification of previously unrecognized discontinuities, and a radiometric dating obtained in a tuff, indicated an Eocene age for the Laguna Brava Formation and the fossil bird footprints, much younger than the previously assigned. We present a detailed paleomagnetic study interpreted within a regional tectonic and stratigraphic framework, looking for an explanation for the misinterpretation of the preliminary paleomagnetic data.The characteristic remanent magnetizations pass a tilt test and a reversal test. The main magnetic carrier is interpreted to be low Ti titanomagnetites and to a lesser extent hematite. The characteristic remanent magnetization would be essentially detrital. The obtained paleomagnetic pole (PP) for the Laguna Brava Formation has the following geographic coordinates and statistical parameters: N=29, Lon.=184.5° E, Lat.=75.0° S, A95=5.6° and K=23.7. When this PP is compared with another one with similar age obtained in an undeformed area, a declination anomaly is recognized. This anomaly can be interpreted as Laguna Brava Formation belonging to a structural block that rotated about 16° clockwise along a vertical axis after about 34Ma. This block rotation is consistent with the regional tectonic framework, and would have caused the fortuitous coincidence of the PP with Early Jurassic poles. According to the interpreted magnetostratigraphic correlation, the Laguna Brava Formation would have been deposited during the Late Eocene with a mean sedimentation rate of about 1.4cm per thousand years, probably in relation to the onset of the Andean deformation. © 2012 Elsevier B.V.

Registro:

Documento: Artículo
Título:Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina)
Autor:Vizán, H.; Geuna, S.; Melchor, R.; Bellosi, E.S.; Lagorio, S.L.; Vásquez, C.; Japas, M.S.; Ré, G.; Do Campo, M.
Filiación:IGEBA (CONICET-UBA), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, Pabellón 2, 1428 Ciudad Autónoma de Buenos Aires, Argentina
INCITAP (CONICET and Universidad Nacional de La Pampa), Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina
CONICET, División Icnología, Museo Argentino de Ciencias Naturales, Av. Ángel Gallardo 470, 1405 Ciudad Autónoma de Buenos Aires, Argentina
Servicio Geológico Minero Argentino, J.A. Roca 651 Piso 10o, 1067 Ciudad Autónoma de Buenos Aires, Argentina
Ciclo Básico Común, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Ciudad Autónoma de Buenos Aires, Argentina
INGEIS (CONICET-UBA), Ciudad Universitaria, 1428 Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:Block rotations; Eocene; Magnetostratigraphy; Paleomagnetism; Red beds; Triassic-Jurassic; Eocene; Magnetostratigraphy; Paleomagnetism; Red bed; Triassic-Jurassic; Radiometry; Stratigraphy; Geomagnetism; age determination; block rotation; discontinuity; Eocene; hematite; Jurassic; magnetostratigraphy; paleomagnetism; remanent magnetization; sedimentation rate; titanomagnetite; Triassic; Argentina; Aves
Año:2013
Volumen:583
Página de inicio:105
Página de fin:123
DOI: http://dx.doi.org/10.1016/j.tecto.2012.10.026
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v583_n_p105_Vizan

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Citas:

---------- APA ----------
Vizán, H., Geuna, S., Melchor, R., Bellosi, E.S., Lagorio, S.L., Vásquez, C., Japas, M.S.,..., Do Campo, M. (2013) . Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina). Tectonophysics, 583, 105-123.
http://dx.doi.org/10.1016/j.tecto.2012.10.026
---------- CHICAGO ----------
Vizán, H., Geuna, S., Melchor, R., Bellosi, E.S., Lagorio, S.L., Vásquez, C., et al. "Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina)" . Tectonophysics 583 (2013) : 105-123.
http://dx.doi.org/10.1016/j.tecto.2012.10.026
---------- MLA ----------
Vizán, H., Geuna, S., Melchor, R., Bellosi, E.S., Lagorio, S.L., Vásquez, C., et al. "Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina)" . Tectonophysics, vol. 583, 2013, pp. 105-123.
http://dx.doi.org/10.1016/j.tecto.2012.10.026
---------- VANCOUVER ----------
Vizán, H., Geuna, S., Melchor, R., Bellosi, E.S., Lagorio, S.L., Vásquez, C., et al. Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina). Tectonophysics. 2013;583:105-123.
http://dx.doi.org/10.1016/j.tecto.2012.10.026