KINEMATICS OF A THRUST FRONT - THE CORBIE RES NAPPE FORELAND NEAR LAGRASSE (AUDE, FRANCE)

Based on a cartographic and microstructural approach, a new interpreta tion of the Lagrasse fold is proposed. The structures developed in thr ee steps, with the shortening direction changing between the second an d third steps. There was: (i) early thrusting (Cagaliere thrust); (ii) folding (Lagrasse fold) and thrusting in the anticlinal hinge (blind Col Rouge thrust); (iii) thrusting in the synclinal hinge (Bade thrust ) and generation of the Cagaliere duplex (anticlinal stack). Schistoge nesis began early but was a continuous process. These structures are r elated to a main thrust at the front of the Corbieres nappe.