The Alpujárride Complex structure and its contribution to the ESCI-Béticas2 deep seismic reflection profile interpretation (Alborán Domain, Betic Chain)
- J. M. Azañón 1
- A. Crespo-Blanc 1
- V. García-Dueñas 1
- M. Sánchez-Gómez 2
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1
Instituto Andaluz de Ciencias de la Tierra
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2
Universidad de Granada
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ISSN: 0214-2708
Year of publication: 1995
Volume: 8
Issue: 4
Pages: 491-501
Type: Article
More publications in: Revista de la Sociedad Geológica de España
Abstract
Profile ESCI-Béticas2 crosses the South Iberian and Alborán Domains in a NE-SW direction, reaching the Mediterranean coast. Below the Alpujárride Complex, this profile shows an almost transparent upper crust, while the lower part of the crust shows moderate reflectivity. The tectonometamorphic evolution of the Alpujárride Complex, which includes a complex succession of contractional and extensional events, constrains the seismic interpretation below the unreflexive layer. The pre-Miocene evolution of the Alpujárride Complex preserves a high pressure event followed by an extensional episode, in turn followed by a second contractional event, yet still before the Miocene. During the Miocene, the rifting of the Alborán Domain occurs, giving way to the Alborán Basin. In its basement, the resulting geometry of the central Betics consists of extensional units bound by brittle faults belonging to two subperpendicular Miocene extensional systems. The lower part of the continental crust is believed to ha ve been affected by the same extensional regime.