Descripción e interpretación de la columna estratigráfica tipo de la serie vulcano-sedimentaria neógena del Valle del Cajón (Catamarca, Argentina).

• Parra, L.E. ^[1] ; Morales, J.A. ^[2]
  1. [1] Universidad Nacional de Catamarca

     Universidad Nacional de Catamarca

     Argentina

     
  2. [2] Universidad de Huelva

     Universidad de Huelva

     Huelva, España

     
• Localización: Geogaceta, ISSN 0213-683X, Nº. 33, 2002, págs. 55-58
• Idioma: español
• Títulos paralelos:
  • Description and interpretation of the type stratigraphic column of the neogene vulcano-sedimentary series from El CajónValley (Catamarca, Argentina).
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• Resumen

  • El Cajón Valley is a tectonic depression elongated in a N-S direction into the geologic province of Sierras Pampeanas (Argentina). The present dynamic in the study area is controlled by a continetal extremely arid climate, where the rains displays an average of 780 mm/year and the teperatures may supper 40°C in summer.

    The sedimentary evolution during the Neogene and the influence on it from a volcanic centre located at the north is the aim of this papero The sedimentological analysis of the stratigraphic formations was realized in a E-W section named Quebrada del Áspero which is affected by a tectonic shortening sliding on muddy strata. Sedimentation consists in an alternance between conglomeratic channels, conglomeratic sandy bodies and wide lutitic strata. The base is constituted by a lutitic formation with lacustrine or lagoonal character. A conglomeratic sequence is located on it. The middle sector of the serie is mainly sandy and finally the top is composed by muds and sands. This sedimentation is characteristic of a braided system. It is significant the presence of epiclastic elemets in the conglomerates and a andesitic/dacitic formation is also present in the middle sequence.