Factors affecting the record of strain fabrics at the anisotropy of magnetic susceptibility: West-Central South-Pyrenean cleavage domain (Southern Pyrenees; NE Spain)

摘要: Abstract Anisotropy of magnetic susceptibility (AMS) is widely used to determine the petrofabric sedimentary rocks. The identification lineation parallel stretching direction or normal shortening usual in weakly deformed environments. When deformation increase, AMS fabrics progress foliation cleavage and expected amplification direction. In order analyze factors influencing an area with a well developed cleavage, four sections across Southern Pyrenean domain have been analyzed. coeval development folding thrusting relatively constant during evolution produce alignment structures tectonic grain mountain belt. Factors affecting record are related presence ferrimagnetic linked shear thrust movement, influence previous strain both paramagnetic particles, degree competition between bedding-related cleavage-related inhomogeneous local structures. These resulted some cases deviation results from sector clear observation at outcrop scale. obtained data show that central zones Pyrenees, geometrical relations not observed low sensitivity can be apparently identified. However, imprint parameters