Resumen de Aportaciones del análisis microestructural a la evolución tectónica del extremo oriental de la Cuenca de Cameros.
L. Marqués, Adolfo Maestro González, Andrés Gil Imaz, Antonio María Casas Sáinz
The analysis of brittle mesostructures in mesozoic rocks of the easternmost part of the Cameros Massif indicates three stages in their tectonic evolution: 1) mesozoic, syn-rift extension, with o-3 varying from N-5 to ENE, determined from orientation of tension gashes and paleostress analysis of striated fault planes, 2) E-W to ESE compression and 3) N-5 to NE-SW compression. The chronology of these two compressions cannot be determined, but relationships between striae on fault planes suggest a possible 2)-3) sequence. The E-W compression could correspond with the mesozoic cleavage-related shortening described by Gil-lmaz and Pocoví-Juan (1994) in neighbour areas. Late N-5 to NE-SW cornpression is consistent with the main shortening stage during the Tertiary in the Cameros Massif and the lberian Chain.
