Fig. 1From: Structure and nature of the Palaeozoic basement based on magnetic, gravimetric and seismic investigations in the central Upper Rhinegrabena Outcrop of the Northern Palaeozoic Vosges and isobaths map of the Triassic bottom derived from the interpretation of seismic sections (after Ménard 1979). Red contour: limits of the new aeromagnetic map. The A zone is shown in this paper. The B zone is completed by the magnetic data at ground level by Edel et al. (1982). Green contour: limits of the additional gravimetric data. Violet contour: location of the detailed maps given in Fig. 8. Location of the seismic sections in the area of the geothermal project: old lines in white, new ones in red. Mei2 is the sole borehole that has cored the granitic basement. Coordinates: Lat/Long in red, Lambert II extended in blue, UTM zone 32 N in green. b Location of the investigated area in the upper Rhinegraben. CF: Champ du Feu; URSZ: Upper-Rhine Shear Zone (Edel et al. 2007). The dashed line in a locates the temperature section of Fig. 11Back to article page