Contractional and extensional tectonics in Flysch and Penibetic units (Gibraltar Arc, SW Spain): new constraints on emplacement mechanisms

Citation
M. Lujan et al., Contractional and extensional tectonics in Flysch and Penibetic units (Gibraltar Arc, SW Spain): new constraints on emplacement mechanisms, CR AC S IIA, 330(9), 2000, pp. 631-637
Citations number
12
Categorie Soggetti
Earth Sciences
Journal title
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DELA TERRE ET DES PLANETES
ISSN journal
12518050 → ACNP
Volume
330
Issue
9
Year of publication
2000
Pages
631 - 637
Database
ISI
SICI code
1251-8050(20000530)330:9<631:CAETIF>2.0.ZU;2-T
Abstract
The Aljibe Unit (Flysch Trough Complex), which can be described as a thin-s kinned contractional belt, represents a major element of the Gibraltar Are accretionary prism. It is shown that this unit underwent WNW-ESE shortening during the Miocene, as did the underlying Penibetic units. The organizatio n of the Aljibe unit suggests a push-from-behind emplacement mechanism duri ng this first contractional event. By contract, the current boundary betwee n the Penibetic and Aljibe units is found to be a normal, low-to-moderate a ngle fault that was later folded. This extensional faulting occurred betwee n two compressional pulses (Lower-to-Middle and Upper Miocene in age) with similar shortening directions. (C) 2000 Academie des sciences / Editions sc ientifiques et medicales Elsevier SAS.