Abstract

TOMEZZOLI, Renata N.  and  CRISTALLINI, Ernesto O.. Structural sections of the Sierras Australes in the Buenos Aires province: Stratigraphic repetition through reverse faults?. Rev. Asoc. Geol. Argent. [online]. 2004, vol.59, n.2, pp.330-340. ISSN 0004-4822.

The Sierras Australes or Sierras de la Ventana are in the southern part of Buenos Aires province, between 37°- 39° S and 61°-63° W and constitute a curved fold and thrust belt with a general northwest strike. They are formed by Precambrian to Permian rocks. The oldest and more intensely deformed rocks outcrop in the western ranges, while the younger and less deformed are placed to the east. In this paper two regional sections from López Lecube to arroyo Quiñihual localities and in the Abra de Agua Blanca - Hinojo are presented, that corroborate the importance of the faulting in the range development. The main contact between the lower Curamalal and Ventana Groups are here interpreted as a thrust that produce their tectonic repetition. An schematic cross section of the range is presented following this idea.

Keywords : Structure; Sierra de la Ventana; Gondwana; Paleozoic.

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