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Geological Society, London, Special Publications; 1999; v. 162; p. 229-238;
DOI: 10.1144/GSL.SP.1999.162.01.18
© 1999 Geological Society of London

The Americas

Palaeolandsurfaces and neotectonic analysis in the southern Sierras Pampeanas, Argentina

Carlos H. Costa1, Aldo D. Giaccardi1 & Emilio F. González Díaz2

1 Departamento de Geología, Universidad Nacional de San Luis, Chacabuco 917, 5700 San Luis, Argentina
2 Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina

The Sierras Pampeanas of northwestern Argentina are ranges underlain by crystalline basement rocks bounded on their western margins by N-S trending reverse faults along which uplift took place during the Andean orogeny. A pre-uplift regional erosion surface is commonly preserved on the eastern slopes which have been tilted in most cases towards the east. No stratigraphical units of Neogene age have been preserved on this surface. The remnants of this palaeolandsurface have been used in the southernmost Sierra de San Luis for reconstructing the palaeotopography, dismembered during Neogene tectonism. This analysis facilitated the identification of minor blocks and the calculation of the vertical component of neotectonic faults as well as a rough estimate of the rates and amplitudes of uplift along the range front. Simple geometrical techniques were applied for a preliminary balancing of cross-sections and for estimating shortening and the detachment depth of faults.





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