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Geoacta

On-line version ISSN 1852-7744

Abstract

MARIO ERNESTO, Gimenez; NOVARA, Iván; ALVAREZ PONTORIERO, Orlando  and  INTROCASO, Antonio. Análisis de la cuencua del Bermejo en los últimos 8 Ma. Geoacta [online]. 2011, vol.36, n.2, pp. 177-187. ISSN 1852-7744.

In the present work, we propose an elastic isostatic flexural model as the dominant mechanism in the generation of structures of the Bermejo foreland basin.The study area has behaved in a different way from the Neogene, therefore it has been divided into at least two stages. The first one, initiates with the formation of the Andean foreland basin up to the beginning of the lifting of Western Sierras Pampeanas. In this stage, the elastic flexure was the predominant mechanism. The second stage, which motivates our work, comprises from the reactivation of the mega fault of Bermejo-Desaguadero up to now, when initiates the elastic bending mechanism on the discontinuous or broken crust.The flexural responses obtained for a crust with an equivalent elastic thickness (Te) between 5 and 7 km, generates a geometry consistent with the current Bermejo basin. These responses are also consistent with the crustal models previously justified from the Bouguer residual anomaly.

Keywords : Elastic Flexure; Broken Plate; Sedimentary Basin; Bermejo Basin; Sierras Pampeanas.

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