Imagery of crustal-scale As-Au-Sb hydrothermal palaeofields in the Variscan belt: vertical seismic reflection (GeoFrance 3D: French Massif Central)

Two new deep seismic profiles have investigated crustal-scale hydrothermal paleofields emplaced during the W-Au-Sb metallogenic epoch between 300 and 320 Ma in Limousin (French Massif Central). The first cuts across the Argen tat Fault, a major channel-way, and the second runs through the Meuzac anti form, the main goldfield in the area. Particular features observed on each profile (transparent seismic zone, crustal scale discontinuities) confirm t he different behaviors of structures and geological formation during this m ineralizing period. ((C) 1939 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.)