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The Santopétar flat-ramp-flat normal fault (Huércal-Overa Basin, SE Betic Cordillera)

2010; Ediuno (Ediciones de la Universidad de Oviedo); Volume: 30; Issue: 30 Linguagem: Inglês

1988-5172

Antonio Pedrera, Jesús Galindo-Zaldı́var, Antonio Guerra-Merchán,

Geology and Paleoclimatology Research

The geometries of the normal faults developed in the Huercal-Overa Basin are clearly linkedwith the rheology of the deformed sediments. While the conjugate normal faults that deform thickhomogeneous conglomerate and calcarenite beds commonly show planar surfaces with a 50-60o dip,the normal faults that deform multilayered sediments frequently have flat and ramp geometries. Wehave studied in detail the flat-ramp-flat Santopetar fault. A new evolution model is proposed to explaintheir development linked to successive phases of faulting accommodated by consecutive flat-ramp-flatfaults with opposite senses of movement. A fault-bend fold fits the geometry of a S-dipping ramp duringa first phase of 23 m top-to-the NE extension. Later, a top-to-the SW 20 m slip over a contractiveflat fault partially reactivates the previous fault surface. However, it is necessary to consider new modelsthat explain the deformation of the Santopetar structure during a single extensional phase.