THE MAIN SYTRUCTURAL TRAITS OF THE NEOGENE BASIN OF TANA FROM THE NORTHERN WEST OF ALGERIA

Abstract

The structural analysis allowed us to know the main faults group that had a regional importance. Where these directions, all of them contributed separately and / or together in the structuration of the basin. Their chronology could be established as fallowed. The most ancient ones are those of N 10 and N 50 of the pre-Atlasic orogen that manifested in distentional regime. Those who affected the basement are viewed on the surface. They are inherited from the Hercynian orogen and thereafter resumed during the Alpine phase. As far as, the direction N10 is also inherited from the t Hercynian orogen and resumed over the Atlasic one (Guardia,1975). On the surface the direction (N-S) and N120 cross the aforementioned ones, so that the former ones are more recent, they have something to do with the Atlasic phase, within which the faults of N50, N20 manifested in subvertical fault and in folded-faults (Guardia,1975). In general the folded chain takes a perpendicular direction with regard the rapprochement of African Eurasia continents.