Criterios geomorfológicos sobre actividad tectónica reciente a lo largo de la Costa Recta, Isla Decepción (Antártida Occidental)

• R. Pérez López ^[1] ; F. Fernández Ibáñez ^[5] ; J.J. Martínez Díaz ^[2] ; C. Paredes ^[3] ; J.L. Giner ^[2] ; A. Caselli ^[4]
  1. [1] Universidad CEU San Pablo

     Universidad CEU San Pablo

     Madrid, España

     
  2. [2] Universidad Complutense de Madrid

     Universidad Complutense de Madrid

     Madrid, España

     
  3. [3] Universidad Politécnica de Madrid

     Universidad Politécnica de Madrid

     Madrid, España

     
  4. [4] Universidad de Buenos Aires

     Universidad de Buenos Aires

     Argentina

     
  5. [5] Instituto Andaluz de Geofísica

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 3, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 179-182
• Idioma: español
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• Resumen

  • Several active tectonic evidences are observed along Costa Recta, located eastward of Deception Island (western Antarctica): marine terraces and fluvial streams cutting a relict glacier. The height of both landforms decrease southward from Macaroni Point, appointing to a tilt movement across a fault plane. Fault planes were measured at Macaroni Point and Baily Head, with a main NNWSSE orientation, similar to the Costa Recta strike. From several scales o f measure, the orientation of the beach was established in two principal segments: N168QE, and N173QE. On the other hand, the beach and glacier dynamics and sedimentary deposits were studied. According to the morpho-tectonic analysis, we conclude that the Costa Recta beach is a retreat scarp of a submarine fault oriented NNW-SSE and located in the Bransfield Strait, although a geophysical study of the marine bottom is needed to map the fault trace in an accurate way.