CONTRIBUTION OF HYDROGRAPY TO THE GEOLOGICAL AND STRUCTURAL MAPPING IN WIDE SOIL COVER REGIONS: CASE OF BAOULE-EAST (MID REGION OF COTE D’IVOIRE) GOLD OCCURRENCE

This research is a contribution of indirect analyses to classic geological and structural mapping. The principles of this analysis is to combine structural streams and structural directions in the goal to find structural building of streams network. Streams were numerized under Arcview and the data of each stream was done. Frequency graphics of number and total length of streams on Strahler classification were built and interpreted with “lois des rivieres”. Recognition of Structural directions was done by the building of Prud’homme main valleys and Howard drainage anomalies. Structural streams have affected by at least point 5 in hierarchy. They are held by N30°, N60°, N130°, N160° orientations. This methodology can be applied at all ivoirian drainage system due to their tree buliding. The main valley is host by N60° direction. Others valleys are holding by N30° N130° et EO. in the landscape, structural directions are sitting as drainage anomalies as directions deviations and linear streams. These directions are well knowed in ivoirian precambrian structural context.