Abstract
We present a comparative analysis of electrical and gravity data on the Geographic Information System of the prerifaines ridges. At the Meso-Cenozo?c sequence, the geometry of the prerifaines ridges is fairly well known. However, the post-Miocene series remain to be characterized. In this perspective, we use a database composed of gravity and vertical electrical sounding profiles and geo-electrical sections in order to characterize this structuration. These data are calibrated by many oil and hydrogeological boreholes. Preliminary results lead to better understanding of the organization of its underlying structures in this area. The Gravimetric filtering results show that the area may be dissected by tree major faults striking NW-SE, NE-SW and N-S. All these faults have contributed, since Hercynian to Alpines orogenies, to the structuring of this area, being proved to be the deepest and can reach 4500 m. The comparison of gravity maps, geological and structural maps under Geographic Information System allows the identification of major structural directions and trends of the study area. It confirms some structural elements gathered from outcrops and define new ones. Results from this work show the importance of using various filtering and interpretation techniques in the analysis of gravity data. They also provide news insights into the deep structure of the study area.
Highlights
The Prerif ridges (Ridges Prérifaines [1]; or Ridges Sud-rifaines [2]) are part of the south western front of the Rif thrust belt
The electrical method is based on the electric potential measurement, which is the result of applying an electric current in the subsoil
In order to illustrate the geometry of the study area deep structure, the used data include a recognition gravity survey on the Sais-Rharb region and its borders on behalf of Cherifien Company of Petroleum (CAG 1946-1949)
Summary
The Prerif ridges (Ridges Prérifaines [1]; or Ridges Sud-rifaines [2]) are part of the south western front of the Rif thrust belt. The Prerif ridges have been, for a long time, interpreted as the Mesozoic material thrust sheets of the head Rif region, thrust sheets that are poured unto the south and the southwest. These thrust sheets are the result of a synchronous Tortonian compression phase in the development of the Prerif nappe [3] [4] [7] [8]. Other authors [3]-[10] have considered these separations as tectonic structures, that materialize the Rif outermost frontal thrust [9] or a flat detachment with frontal amortization [10]. Through the integration and the re-interpretation of geophysical data: gravimetric, electric and seismic
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