ETUDE GEOMAGNETIQUE DE ...
ETUDE GEOMAGNETIQUE DE LA PARTIE MERIDIONALE DU MASSIF DEVILLIEN DE GRAND-HALLEUX (MASSIF DE STAVELOT)
J.M. Graulich & J.L. KoeningsfeldMemoirs of the GSB n°3 - 1962
ABSTRACT.
The authors have surveyed magnetometrically the southern part of the "Massif devillien" of Grand-Halleux (Eastern Ardennes) and have drawn a magnetometric map of the explored area. They detected marker-horizons consisting of magnetite-bearing phyllites embedded in the devillian strata, which led them to draw the following conclusions based on the magnetometric map :
- There are two continuous marker-bands of the type mentioned, the upper one lying near the top of the Devillian, the lower one below the so-called "Hourt Quartzites". Locally a third band exists above the lower horizon.
- The "Hourt Quartzites", which have been up to now considerer as the oldest strata (Dv1) outcropping in the massif, are in fact a facies only locally developped as a large lenticle, gently dipping south and intercalated in between the two magnetite-bearing marker-bands.
- The devillian strata build up the sedimentary substratum of the Revinian. They do not outcrop in a tectonic window.
- The pattern of the southern limb of the devillian anticline of Grand-Halleux is a simple one. It consists of beds gently dipping southwards interrupted only by a high-angle dips over short distances and by reverse faults.
- The whole structure is disrupted by numerous transverse faults with little offset.
