Arc-parallel vs back-arc extension in the Western Gibraltar arc : is the Gibraltar forearc still active?
Balanyá, J. C. (Universidad Pablo de Olavide. Departamento de Sistemas Físicos, Químicos y Naturales)
Crespo-Blanc, A. (Instituto Andaluz de Ciencias de la Tierra)
Díaz-Azpiroz, M. (Universidad Pablo de Olavide. Departamento de Sistemas Físicos, Químicos y Naturales)
Expósito, I. (Universidad Pablo de Olavide. Departamento de Sistemas Físicos, Químicos y Naturales)
Torcal, F. (Instituto Andaluz de Geofísica y Prevención de Desastres Sísmicos)
Pérez-Peña, José Vicente (Universidad de Granada. Departamento de Geodinámica)
Booth-Rea, G. (Universidad de Granada. Departamento de Geodinámica)

Date:	2012
Abstract:	Extremely tight arcs, framed within the Eurasia-Africa convergence region, developed during the Neogene on both sides of the western Mediterranean. A complex interplate deformation zone has been invoked to explain their structural trend-line patterns, the shortening directions and the development of back-arc basins. Updated structural and kinematic maps, combined with earthquake data covering the complete hinge zone of the western Gibraltar arc help us to explore the mode of strain partitioning from 25My ago to present. During the Miocene, the strain partitioning pattern showed arc-perpendicular shortening in the active orogenic wedge -assessed from the radial pattern of tectonic transport directions- accompained by subhorizontal stretching. Structures accommodating stretching fall into two categories on the basis of their space distribution and their relationships with the structural trend-line pattern: i) arc-parallel stretching structures in the external wedge (mainly normal faults and conjugate strike-slip faults); and ii) extensional faults developed in the hinterland zone in which transport directions are centripetal towards the Alborán back-arc basin. Pliocene to Recent deformational structures together with focal solutions from crustal earthquakes (n=167; 1. 5.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Forearc tectonics ; Strain partitioning ; Crustal earthquakes ; Gibraltar arc
Published in:	Geologica acta, Vol. 10, Núm. 3 (setembre 2012) , p. 249-263, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/263583
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001771
DOI: 10.1344/105.000001771

18 p, 7.6 MB

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