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A test of helicopter-borne geophysics, jointly organized by BRGM and the « Musee des antiquites nationaless » (MAN), was performed in 2001 by the BGR (federal geological survey of Germany) in the salt basin of the upper Seille valley (Lorraine, France). The main methods used were multi-frequency electromagnetism (EM) and Earth magnetometry (Mag). The main objective of BRGM was the precise 3D mapping of the areas saturated with salt water, which are strongly conductive. The objective of MAN was to detect accumulations of pottery that was used, at the iron age, for producing salt by evaporating brine over wood fires; such pottery can give a remanent magnetic anomaly. It appears from this test that the EM method perfectly fulfils the hydrogeological objective, providing a precise 3D geometry of the freshwater/saltwater interface; the method also seems promising for the archaeological objective, possibly in conjunction with Mag.

Cartographie 3D de l’interface eau douce/eau salée par méthode électromagnétique héliportée sur le bassin salifère de la Seille