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Recent palaeostresses from striated pebbles related to fold development in a mountain front: the Prerif Ridges (Rif Cordillera, Morocco)

By
P. Ruano
P. Ruano
Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain
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K. Bargach
K. Bargach
Département des Sciences de la Terre, Faculté des Sciences, Université Mohammed V-Agdal, BP 1014, Rabat, Morocco
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J. Galindo-Zaldívar
J. Galindo-Zaldívar
Departamento de Geodinámica, Universidad de Granada, 18071, Granada, Spain (e-mail: jgalindo@ugr.es)
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A. Chalouan
A. Chalouan
Département des Sciences de la Terre, Faculté des Sciences, Université Mohammed V-Agdal, BP 1014, Rabat, Morocco
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M. Ahmamou
M. Ahmamou
Département des Sciences de la Terre, Faculté des Sciences, Université Mohammed V-Agdal, BP 1014, Rabat, Morocco
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Published:
January 01, 2006

Abstract

The southern mountain front of the Rif Cordillera (Morocco) provides impressive geological evidence of the most recent deformations related to the activity of the Eurasian-African plate boundary in the Western Mediterranean. In this region, striated and pitted pebbles are analysed from Pliocene-Quaternary rocks located in the southern front of the Prerif Ridges, which have been deformed by south-vergent folds of decametre to hectometre sizes. Striated and pitted pebbles represent a tectonic deformation structure which, although very scarce in nature, is revealed as one of the most complete for determining palaeostresses. In Jbel Trhat and Jbel Zerhoun of the Rif mountain front, north-south to NNW-SSE prolate compression stress ellipsoids are related to an initial stage of south-vergent fold development during the progressive tilting of conglomerate layers. Finally, oblate stress ellipsoids indicate extension parallel to the fold axes. The north-south trend of the determined compression is compatible with a tectonic setting where the NW-SE convergence of the Eurasian and African plates is modified by the westward motion of large crustal blocks such as the Alboran Domain or the southwestward motion of blocks in the Rif Cordillera.

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Contents

Geological Society, London, Special Publications

Tectonics of the Western Mediterranean and North Africa

G. Moratti
G. Moratti
CNR-Institute of Geosciences and Earth Resources, Italy
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A. Chalouan
A. Chalouan
University of Mohammed V Agdal, Rabat, Morocco
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Geological Society of London
Volume
262
ISBN electronic:
9781862395107
Publication date:
January 01, 2006

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