Pamplona J. & Ribeiro A.

Presented in the XIII Reunião de Geologia do Oeste Peninsular, Salamanca, 1995

Abstract
The lithologies of this sector belongs to the Aucthocthonous of CIZ. They are characterized by the presence of psammopelits and quartzites, chiastolite schistes with some iron oxides levels, garnet andalusite nodular schistes and staurolithic schistes (all the lithofacies belong to Ordovician). The intrusives rocks are represented by the Bouça do Frade Granite.
Tectonically, we can verified that in the beginning of D1 occurs a transpressive regimen with sinistral component, having as result folding, the axial plane S1 surface, sinistral shears/faults. At the end of D1 attend to the passage to a tangential deformation regimen towards E making a stretching lineation according to the kinematic axis a and sheath folds. The most important fact during D2 was the passage of a pure shear regimen, that origined essentially conjugate strike-slip faults, to a tangential deformation regimen towards W. This last, is decisive in the occurrence of Bouça do Frade pluton's laminar extravasing and, therefore, by the appearance of inverse faults/thrusts; by folds axial planes moderately inclined and with dip < 30; by fracture cleavage with variable dip and dependente of a major proximity (few inclined) or minor proximity (moderately inclined) to the Bouça do Frade pluton. The D3 is characterized by sinistral transpression wich origin open folds and conjugate shear corridors.