Author details

San Rafael orogenic phase. There is also a movement of the Kmin from the horizontal, in the western sites at the base in the respective sequences, to the vertical in the eastern sites situated at the respective tops, and a change of the respective shape parameter. Thus, indicate a transition from a magnetic fabric with a clear tectonic imprint to transitional to sedimentary fabrics, similar to the conceptual models proposed by several authors in thrust and fold belts ([60], between others). The younger localities as Gonzales Chavez and Lopez Lecube, practically have no signature of deformation. These are evidencing pulses in the deformation intensity that diminish toward the east and an advance of the orogenic front toward the foreland basin, with the main stress from the southwest. This deformation coincides with an abrupt curvature in the apparent

Nevertheless, in the patterns of the old rocks (Cerro de los Viejos, Cerro Colorado, Lolén Formation and Agua Escondida), the signature is no constant and the main stresses could be placed from the southwest, from the west or from the south. They have complex patterns that are related to the overlapping of different orogenic phases or to local lithological control of

In the Cavado granite and its dikes, of the Choiyoi Group, the fabrics are triaxial without axes situation common pattern, so the emplacement of these bodies seem to correspond to local effects. In the case of other dikes and the Choiyoi ignimbrite, the fabrics are similar, but they do not seem to have a clear relation with the diaclase planes. Probably the emplacement of these

Figure 7. Apparent polar wander path of the south west Gondwana proposed by Tomezzoli [62] constructed from the paleomagnetic poles (PPs) selected from South America between the carboniferous and Triassic. Botton, plate accretion

bodies corresponds to complex stress patterns previously installed in the region.

polar wander of Gondwana in the Upper Paleozoic ([61, 62]; Figure 7).

each locality.

26 Tectonics - Problems of Regional Settings

during Permian times.

Arzadún Guadalupe1,2\*, Tomezzoli Renata Nela2,3, Tickyj Hugo4 , Cristallini Ernesto Osvaldo1,2,5 and Gallo Leandro Cesar<sup>2</sup>

\*Address all correspondence to: guadalupe.arzadun@gmail.com

1 Laboratorio de Termocronología (LaTe Andes), Vaqueros, Salta, Argentina

2 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina

3 Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Instituto de Geociencias Básicas y Aplicadas de Buenos Aires (IGEBA), Laboratorio de Paleomagnetismo D.A. Valencio, Universidad de Buenos Aires, Argentina

4 Departamento de Geología, FCEyN, Universidad Nacional de La Pampa, Argentina

5 Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Laboratorio de Modelado Geológico (LAMOGE), Universidad de Buenos Aires, Argentina
