Resumen de Análisis de la deformación de los sistemas de venas y filones hidrotermales de la Península de Hurd (Isla Livingston, Antártida Occidental)
María del Carmen García Cuevas, José Manuel González Casado
In Hurd Peninsula (Livingston Island, Western Antarctica) has been analysed the orientation of calcite c-axes and e-twin from the sparitic grains that filled the hydrothermal veins and lodes in this region. The c-axes orientations allow to establish that during the Upper-Cretaceous tectonic episode, when these veins were developed, took place an E-W extension, although other extension direction, e.g. NW-SE, also are active. The analysis of the calcite e-twins show the existence of compressional strain ellipsoids with two different orientations. A first group has an orientation that is compatible with a N-S compression direction, i.e. the same direction associated with the development of the veins. While the other is close to E-W and It is probably related with local tectonic structures. The presence of type I and II e-twins allow to deduce that the deformation temperature ranges between 150 to 300°C. Both, the strain intensity and the temperature increases towards the south part of Hurd Peninsula
