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Abstract:

The Chaco foreland basin was initiated during the late Oligocene as a result of thrusting in the Eastern Cordillera in response to Nazca-South America plate convergence. Foreland basins are the result of the flexural isostatic response of an elastic plate to orogenic and/or thrust sheet loading. We carried out flexural modelling along a W-E profile (21.4°S) to investigate Chaco foreland basin development using new information on ages of foreland basin strata, elastic and sedimentary thicknesses and structural histories. It was possible to reproduce present-day elevation, gravity anomaly, Moho depth, elastic thicknesses, foreland sedimentary thicknesses and the basin geometry. Our model predicted the basin geometry and sedimentary thicknesses for different evolutionary stages. Measured thicknesses and previously proposed depozones were compared with our predictions. Our results shed more light on the Chaco foreland basin evolution and suggest that an apparent decrease in elastic thickness beneath the Eastern Cordillera and the Interandean Zone could have occurred between 14 and 6 Ma. © 2009 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Flexural isostasy in the Bolivian Andes: Chaco foreland basin development
Autor:Prezzi, C.B.; Uba, C.E.; Götze, H.-J.
Filiación:CONICET, Universidad de Buenos Aires, INGEODAV, Pabellón 2, 1428, Buenos Aires, Argentina
Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Str 25, 14476 Potsdam, Germany
Institut für Geowissenschaften, Abteilung Geophysik, Christian Albrechts Universität, Otto-Hahn-Platz 1, 24118 Kiel, Germany
Palabras clave:Basin development; Central Andes; Chaco foreland; Flexural isostasy; Flexural modelling; Basin development; Central Andes; Chaco foreland; Flexural isostasy; Flexural modelling; Geodesy; Plates (structural components); Sedimentology; Tectonics; basin evolution; elastic property; foreland basin; gravity anomaly; isostasy; Moho; Oligocene; thrust; Andes; South America
Año:2009
Volumen:474
Número:3-4
Página de inicio:526
Página de fin:543
DOI: http://dx.doi.org/10.1016/j.tecto.2009.04.037
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v474_n3-4_p526_Prezzi

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Citas:

---------- APA ----------
Prezzi, C.B., Uba, C.E. & Götze, H.-J. (2009) . Flexural isostasy in the Bolivian Andes: Chaco foreland basin development. Tectonophysics, 474(3-4), 526-543.
http://dx.doi.org/10.1016/j.tecto.2009.04.037
---------- CHICAGO ----------
Prezzi, C.B., Uba, C.E., Götze, H.-J. "Flexural isostasy in the Bolivian Andes: Chaco foreland basin development" . Tectonophysics 474, no. 3-4 (2009) : 526-543.
http://dx.doi.org/10.1016/j.tecto.2009.04.037
---------- MLA ----------
Prezzi, C.B., Uba, C.E., Götze, H.-J. "Flexural isostasy in the Bolivian Andes: Chaco foreland basin development" . Tectonophysics, vol. 474, no. 3-4, 2009, pp. 526-543.
http://dx.doi.org/10.1016/j.tecto.2009.04.037
---------- VANCOUVER ----------
Prezzi, C.B., Uba, C.E., Götze, H.-J. Flexural isostasy in the Bolivian Andes: Chaco foreland basin development. Tectonophysics. 2009;474(3-4):526-543.
http://dx.doi.org/10.1016/j.tecto.2009.04.037