A "core-complex-type structure" formed by superposed ductile and brittle extension followed by folding and high-angle normal faulting. The Santi Petri dome (western Betics, Spain).

Booth-Rea, G., Azañól, J. M., García-Dueñas, V. and Sánchez-Gómez, M. (2003) A "core-complex-type structure" formed by superposed ductile and brittle extension followed by folding and high-angle normal faulting. The Santi Petri dome (western Betics, Spain). Open Access Comptes Rendus Geoscience, 335 (2). pp. 265-274. DOI 10.1016/S1631-0713(03)00026-9.

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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.

Document Type: Article
Keywords: Core-complex; Alboran domain; Western Betics; Malaga; Spain
Refereed: Yes
Open Access Journal?: No
Publisher: Elsevier
Date Deposited: 18 Feb 2008 17:26
Last Modified: 15 Sep 2016 07:28
URI: https://oceanrep.geomar.de/id/eprint/2024

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