
[Resumen] En la zona de cizalla dúctil asociada a la falla normal de Vivero, los macizos graníticos de Hombreiro y Santa Eulalia de Pena (emplazados en el bloque de muro) han sufrido una intensa milonitizacion. El estudio de la fábrica del cuarzo proporciona varios tipos de diagramas que evidencian una importante caída de la temperatura durante el proceso de deformación asociada a la falla de Vivero. Se propone que esta disminución de la temperatura es reflej o del carácter extensional de la falla de Vivero que conduce al levantamiento progresivo del bloque de muro.
[Abstract] In the ductile shear zone associated to the normal Vivero fault, Hombreiro and Santa Eulalia de Pena granitic massifs (emplaced in the foot wall block) have undergone intense mylonitization. Quartz~fabric analysis provides some types of diagrams which rather evidence an important temperature-fall coeval with deformation process associated to the Vivero fault. This temperature-decrease is proposed to a result of extensional character of the Vivero fault, leading to progressive uplift of the foot-wall.
Normal Vivero fault (Galicia), Falla de Vivero (Galicia), Shear ductile, Quartz fabric, Fábrica del cuarzo, Cizalla ductil
Normal Vivero fault (Galicia), Falla de Vivero (Galicia), Shear ductile, Quartz fabric, Fábrica del cuarzo, Cizalla ductil
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