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Thème 2 : Géologie structurale
Driss Sadkaoui, Mohammed Benabdelhadi, Benoît Deffontaines, Abdel-Ali Chaouni, Ahmed
Ntarmouchant, Abdennasser Baali, Brahim Benzouggagh, LahcenGourari (2015) -Indices
néotectoniques dans les sediments du lac ifrah (Moyen Atlas, Maroc) In European Scientific
Journal mai 2015 vol.11, No14. P. 147 – 164.
Driss Sadkaoui, Lahcen Gourari, M. Benabdelhadi, H. El Arabi, A. Oujaa & M. Fountougne : 2011-
Etude géomorphologique de Boutkhoubaye au nord-est de Michlifène (Moyen Atlas, Maroc).
In actes de la RQM6, Tanger 2011, X, XX, p 42 - 55.
Sadkaoui D, Gourari L., El-Arabi h., Fontugne M., Oujaa a., & Benabdelhadi. 2011 - Géomorphologie
de Boutkhoubaye (Région d’Ifrane, Moyen Atlas, Maroc). 6e Rencontre des Quaternaristes
Marocains (RQM6), Tanger, 15 – 17 novembre 2011.
Statistical analysis and fractures network mapping using remote sensing in
the Paleozoic Massif of Tichka (Western High Atlas, Morocco)
H. Si Mhamdi1 M. Raji1 S. Maimouni2 & M. Oukassou1
1, Hassan II University of Casablanca, Faculty of Science Ben M'Sik, Department of Geology, Laboratory of
Sedimentary Basins Dynamics and Geological Correlation, Casablanca, Morocco, Email:
Hicham.simhamdi@gmail.com
2, Hassan II University of Casablanca, Faculty of Science Ben M'Sik, Department of Geology, Laboratory of
Applied Geology , Geomatic and Environment, Casablanca, Morocco
Nowadays, using remote sensing in the study of geological environments, particularly in
lineaments (fractures) mapping, constitute an essential element to get an idea about
distribution and relationships between fractures. Several approaches have been developed
to detect and extract the lineament intuitively. The methodologies used in this study are the
visual- interpretation and conventional algorithms of classifications to obtain close results to
geological interpretations.
The analysis of Landsat UTM+ images of the Paleozoic Massif ofTichka allowed
recognizing at least Tree directional fractures with regional importance. The various
treatments permits to establish a fractures map that shows at less tree preferential
orientations N-S, E-W, NW-SE and NE-SW directions with a dominance of the last one,
which is located mostly in the external zone of granitic complex. 46% of fractures have an
average length of 1km to 2km.
Geological interpretations of linear structures obtained by remote sensing were made on
the basis of pre-existing geological maps and field-trips observations.
From existing relationships between tree directional fractures, we can reconstruct the
chronology from the two orogeny’s that succeeded in the Western High Atlas.The geometry
and kinematics of fractures found along the studied domainpresent a variability that we can
observe at different scales.It is highly probable that the ancient faults trending are NE-SW, E-
W,with a high density in the external zones of the granitoide subsequent to fracturing period.
Those fractures can be due to the principal stress fromthe Hercynianage. Previous
Hercynian faults areremobilized during the late Hercynian phases, where the E-W and NE-
SW faults rework respectively as revers and senestralstrike slip faults.
All fractures contribute continually, together or separately to structuring the Paleozoic
Massif of Tichka since Hercynian to the Alpin orogeny.
Keywords: fractures, tectonic, Remote Sensing, Photo-interpretation, Late Hercynian,
Tichka, Western High Atlas, Morocco.