Notice explicative de la cartographie multi-couches à 1/50,000 et 1/20,000 de la zone d’activité du Cap-Vert, Sénégal

Translated title of the contribution: Explanatory booklet of the 50k and 20k multi-layered map of the Cap-Vert activity area, Senegal

Jack Roger, Olivier Banton, Jean-Pierre Barusseau, Paul Castaigne, Jean-Christophe Comte, Cedric Duvail, Pierre Nehlig, Bernard Noel, Olivier Serrano, Yves Travi

Research output: Book/ReportCommissioned Report


The numerical multilayered mapping at 1/50 000 of the area of activity of the Cap-Vert to the west of the 16°40’W meridian, provides Senegal with her first geological maps at this scale. The multilayered mapping fully developed on the Geographical Information System (GIS) presents layers of topography, substratum geology, geology of cover formations, aquifers hydrogeology, aquifer potential, piezometry, hydrogeochemistry, aquifer vulnerability, underground invasion by brackish waters, listing of mines and quarries, mineral resources’ potential and ground occupation.

The numerical multilayered mapping at 1/20 000 of the Cap-Vert peninsula, to the west of the 17°10’W meridian, updates the geological maps by Elouard, Hébrard et al. (1976). However, the new dispensation proposes different maps for the solid geology and for the soft cover. Additional layers concern: aquifer
contamination by nitrates and pesticides, susceptibility to the phenomena of swelling and shrinking soils, and geotechnical ability.

Observation points from archives, boreholes and field operations have been stored in the GIS, where they can easily be consulted along with the relevant information, documentation, sketches and pictures. The GIS is a dynamic, interactive tool with its layers ready for continuous updating.

Geometrical modelling of the volcanic and sedimentary formations reveals an unsuspected dense faulting system on the eastern side of the peninsula.

Present building above potentially risky areas, on the western coast of the peninsula, is bound to draw a renewed attention to geotechnics in the foreseeable future.
Translated title of the contributionExplanatory booklet of the 50k and 20k multi-layered map of the Cap-Vert activity area, Senegal
Original languageFrench
Commissioning bodyMinistère des Mines, de l’Industrie et des PME, Direction des Mines et de la Géologie, Dakar
Number of pages245
Publication statusPublished - 2009


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