Acta Musei Moraviae

Geological Interpretation of the Geomagnetic Anomalies of the NE Moravia and the Czech Part of Silesia

A semi-detailed ground magnetic survey carried out by portable proton magnetometers during 1999-2002 supplied a new comprehensive pattern of the geomagnetic field in the NE part of the Czech Repub1ic. Three types of the anomalies were distinguished in this area. The short-wave anomalies situated predominantly in the central part of the area studied belong to volcanic bodies of the teschenite association (Cretaceous to Jurassic age). Not frequently distributed middle-wave anomalies are interpreted as a response of buried Late Paleozoic intermediate volcanites that have been found only in borehole cores, yet. The long-wave anomalies cover two partial areas, the first one is in the N (in the Opava-Bohumín area), the second one is situated in the Beskydy Mts. and in its W and S surroundings. Both of them are considered to be the response of the Brunovistulian crystalline basement. The extent of the buried southern part of the Upper Silesian coal-bearing Basin is interpreted and compared with the basement structure being interpreted from the geomagnetic field pattern.