TIMING OF MAGMATISM, FORELAND BASIN DEVELOPMENT, METAMORPHISM AND INVERSION IN THE ANGLO-BRABANT FOLD BELT

New data implying crustal activation of Eastern Avalonia along the Ang lo-Brabant fold belt are presented. Late Ordovician subduction-related magmatism in East Anglia and the Brabant Massif, coupled with acceler ated subsidence in the Anglia Basin and in the Brabant Massif during S ilurian time, indicate a foreland basin development. Final collision r esulted in folding, cleavage development and thrusting during the mid- Lochkovian to mid-Eifelian. In the southeast of the Anglo-Brabant fold belt, Acadian deformation produced basin inversion and the regional a ntiformal structure of the Brabant Massif. The uplift, inferred from t he sedimentology, petrography and reworked palynomorphs in the Lower D evonian of the Dinant Synclinorium is confirmed by illite crystallinit y studies. The tectonic model discussed implies the presence of two su bduction zones in the eastern part of Eastern Avalonia, one along the Anglo-Brabant fold belt and another under the North Sea in the prolong ation of the North German-Polish Caledonides.