Conical folding in the core of an orocline. A geometric analysis from the Cantabrian Arc (Variscan Belt of NW Iberia)

摘要: Abstract The Cantabrian Arc of the Variscan Belt has been recently defined as a true orocline, constraining kinematics and deformation timing. This curved sector orogenic belt is characterized by two different fold sets: (1) one runs parallel to outcrops main thrusts describes horseshoe shape concave towards east, (2) another radial arc. A detailed geometric study interference patterns in revealed conical nature folds belonging set. These developed with geometrical characteristics (semi-apical angles axis attitudes) depending on initial orientation geometry folded surfaces. They are interpreted result from vertical rotation during oroclinal buckling NW Iberia. highlights that arcs powerful tool for establishing sequence tectonic events because due secondary differential rotations provide unique observed can be extrapolated other oroclines.