Geometría y estructura del Delta del Ebro

• A. Maestro ^[1] ; A. Barnolas ^[1] ; L. Somoza ^[1] ; E. Llave ^[1]
  1. [1] Instituto Geológico y Minero de España

     Instituto Geológico y Minero de España

     Madrid, España

     
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 2, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España), págs. 245-248
• Idioma: español
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• Resumen

  • In the Ebro Delta, small-scale synsedimentary deformation has been observed by means of highresolution seismic correlated with a network of wells. The main structures are normal faults with a steep upper surface (4CT-6CT) that passes downward into a horizontal shear plane. The shear plane appears seismically as chaotic and convoluted high-amplitude reflectors and is correlated with well data showing layers that include gravel, sand and clays. Associated structural features include reverse drag of reflectors, antithetic faults, and fluid escapes (methane/water). The overall growth faults province appears to represent a deeper-seated general movement of the delta mass involving differential loading, overpressure of fluids, diapiric movements, and extensional tectonics that cause listric faults and associated structures at different scales. The recent growth faults are regularly spaced, with the distance between successive faults controlled by the depth to the detachment layer.