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- Title
Present recharge of an aquifer in a semi-arid region: an example from the Turonian limestones of the Errachidia basin, Morocco
- Authors
Mudry, J.; Mania, J.; Marzouk, M.; Elyamine, N.; El Ouali, A.; Chauve, P.
- Abstract
The Errachidia basin is composed of three superposed aquifers (Senonian, Turonian limestones and Infracenomanian). The Liassic limestone of the upper Atlas borders the northern part of the basin. The piezometric map of the Turonian aquifer displays a north-south flow, with an inflow area from the Atlas. This recharge hypothesis is demontratedby a discriminant analysis performed on chemical data: the majority of the spots are of sodium choride and hydrogenocarbonate types, while several boreholes are assigned to a calcium hydrogenocarbonate typeJurassic component. 18O measurements, using the Atlasic gradient <delta>18O=-4.18-0.0027 x elevation to estimate the recharge areas, confirm that the recharge area is the basin itself (<1100 m) on the Turonian outcrops, while in the confined part, the Turonian is recharged higher than 1400 m (corresponding to the Atlas).This contribution ranges from 56 to 85%, according to the situation versus the piezometric inflow area. The remainder represents infiltration and vertical leakage from the Senonian layers.
- Subjects
GROUNDWATER; HYDROGEOLOGY; SALT
- Publication
Environmental Geology, 1999, Vol 38, Issue 2, p171
- ISSN
0943-0105
- Publication type
Article