Determination of the folding mechanism by AMS data. Study of the relation between shortening and magnetic anisotropy in the Pico del Aguila anticline (southern Pyrenees)

摘要: Abstract The study of the anisotropy magnetic susceptibility (AMS) carried out in 12 sites located syntectonic marls a flexural fold has allowed to interpret fabrics their tectonic framework. sensitive preferred orientation phyllosilicates is considered as main responsible fabric due external forces (e.g. those that produce deformation). A clear longitudinal tangential mechanism can be recognised hinges structure. Due synsedimentary growing anticline we propose dynamical model explain results obtained at syncline hinges. This correlates well with data and allows us differentiate degree deformation between synclines surround anticline. Furthermore an approach relationship differences geometrical shortening (P′) fitted similarity mechanical properties studied rocks coaxiality initial (sedimentary) overprinted one (tectonic).