Abstract
Interpretation of magnetic and gravity anomaly maps, derived and prolongated maps has lead to the establishment of a detailed map of the magnetic and gravimetric structure of the Rhine basement (Vosges, Rhine Graben, Black Forest) and to a larger-scale map of the Variscan basement on Central Europe (from the Paris Basin to the Franconian Jura). These maps show the characteristics of the rocks (strong or weak magnetisation ; high, average or low density) that are predominant on the upper kilometers of the basement. They enable zones and sub-zones, showing similar characteristics, to be set up and followed beneath the sedimentary cover. At outcrop these zones usually coincide with the structural zones of the Variscan chain. Some important strike-slip faults are revealed among the important structural discontinuities, such as the N 35° sinistral fault of the Upper Rhine Graben and the dextral Lalaye — Lubine — Vittel fault. These maps lead to a better understanding of the structure and formation of the Variscan chain.
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