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Bulletin de la Societe Geologique de France; September 2006; v. 177; no. 5; p. 227-236; DOI: 10.2113/gssgfbull.177.5.227
© 2006 Societe Geologique de France
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A multidisciplinary approach to determine the structural geometry of hard-rock aquifers. Application to the Plancoet migmatitic aquifer (NE Brittany, W France)

Véronique Durand1, Benoît Deffontaines2, Véronique Leonardi3, Roger Guerin4, Robert Wyns5, Ghislain de Marsily6 and Jean-Luc Bonjour7

1 UMR Sisyphe, UPMC, case 123, 4 place Jussieu, 75252 Paris cedex 05, France, veronique.durand{at}ccr.jussieu.fr
2 Université Marne-la-Vallée, Bât IFI, laboratoire G2I, 5 Bd Descartes, Champs-sur-Marne, 77454 Marne-La-Vallée cedex 2, France, benoit.deffontaines{at}univ-mlv.fr
3 UMR Sisyphe, UPMC, case 123, 4 place Jussieu, 75252 Paris cedex 05, France, veronique.leonardi{at}ccr.jussieu.fr
4 UMR Sisyphe, UPMC, case 123, 4 place Jussieu, 75252 Paris cedex 05, France, guerin{at}ccr.jussieu.fr
5 BRGM, CDG/MA, BP 6009, 45060 Orléans cedex 02, France, r.wyns{at}brgm.fr
6 UMR Sisyphe, UPMC, case 123, 4 place Jussieu, 75252 Paris cedex 05, France, gdm{at}ccr.jussieu.fr
7 Nestlé Waters MT, BP 101, 88804 Vittel cedex, France, jean-luc.bonjour{at}waters.nestle.com

A new multidisciplinary methodology is developed to determine the structural geometry of hard-rock aquifers. The Plancoët migmatitic basement, chosen as an example for the use of this methodology, is studied both at a regional (300 km2) and a local (4 km2) scale. The regional mapping, based on field mapping of the tectonic structures and the weathered layers, on geostatistics and on aerial photographs and Digital Elevation Model (DEM) analyses, demonstrates the influence of the tectonic structures on the weathering processes. Some geo-electric investigations, added to the first mapping at the local scale, lead to the building of a local geometrical model of the aquifer.

Key Words: Metamorphic aquifer • Morphostructural analysis • Weathered zones • Electrical investigations • Geometrical model






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