A ‘core-complex-like structure’ formed by superimposed extension,folding and high-angle normal faulting. The Santi Petri dome (western Betics,Spain) |
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Authors: | Guillermo Booth-Rea José Miguel Azañón V??ctor Garc??a-Dueñas Romain Augier Mario Sánchez-Gómez |
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Institution: | 1. Departamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain;2. Laboratoire de tectonique, UMR 7072, université Pierre-et-Marie-Curie, tour 26–25 E1, case 129, 4, place Jussieu, 75252 Paris cedex 05, France;3. Departamento de Geolog??a, Universidad de Jaén, 23071 Jaén, Spain |
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Abstract: | The Santi Petri dome (western Betics, southern Spain) shows a core-complex-like structure, where migmatitic gneisses and schists outcrop below low-grade slates and phyllites, all of which form the basement of the Neogene Málaga basin. The migmatites and schists suffered a coaxial-flattening event during isothermal decompression and were later exhumed by ductile ESE non-coaxial stretching. Further exhumation was achieved by W- to SW-transport brittle low-angle normal faulting. Subsequently these extensional structures were gently folded in the core of a NE/SW-oriented antiform during the Tortonian. Finally the Santi Petri domal geometry was accentuated by the interference of orthogonal high-angle faults with ENE–WSW and NNW–SSE orientation. This core-complex-like structure, formed by superposition of extensional and compressive tectonic events, does not represent a classical, purely extensional core complex, which shows that metamorphic structure and geometry are not decisive criteria to define a core-complex. |
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Keywords: | Core-complex Alboran domain Western Betics Malaga Spain Domaine d'Alboran Bétiques occidentales Malaga Espagne |
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