RESTORATION OF A BROKEN UP STRUCTURAL SET WITH THE HELP OF A TRIRECTANGULAR REFERENCE SYSTEM - CONJUGATED KINK-BANDS AND PERMIAN FAULTS IN THE WESTERN MAURES BELT (VAR, FRANCE)

The western part of the Maures belt underwent several ductile tectonic phases followed by an intense fracturation: late Hercynian to Stephan ian sinistral N-S faulting and Permian sinistral ENE-WSW faulting. The Permian faults cut the western bell into a series of E-W elongated bl ocks which have moved relative to one another. This study deals with t he resulting rotations induced by these faults, in order to make the v arious blocks orientations coincide and attempt to reconstitute the in itial state of the Hercynian basement before Permo-Carboniferous erosi on. The present method consists of taking, in each block, a trirectang ular reference system corresponding to the main stress axes deduced fr om conjugate kink-band systems. The latter characterize a N-S compress ive event which took place after the ductile phases but before the bre ak-up of the belt.