Stress field and thrust kinematics: a model for the tectonic inversion of the cameros massif (Spain)
Alpine tectonics of the Cameros Thrust has been studied from several points of view: geometry (surface and sub-surface structure, three-dimensional outline of the thrust), kinematics (transport direction) and dynamics (characterization of the regional compressional stress field). All three aspects are related by means of a model based on Bott's equation. Under a N to NNE horizontal compression, with an average stress ratio R = ( σz - σx)/( σy - σx) = 0.2, the eastern ramp of the Cameros Thrust (oriented 155°, 30°W) underwent a strike-slip right-lateral movement with a small reverse component. This gave rise to rigid displacement of the Cameros block towards the NNW and produced a 'guided movement' on the western, frontal ramp (oriented 060°, 13°S).