Discriminación de mecanismos de deformación dominantes en las calizas miloníticas del Zilair Thrust (Sur de Urales), mediante el análisis de paleoesfuerzos

• F.J. Fernández ^[1] ; D. Brown ^[2] ; J. Álvarez-Marrón ^[2] ; A. Pérez-Estaún ^[2] ; R. Menéndez-Duarte
  1. [1] Universidad de Oviedo

     Universidad de Oviedo

     Oviedo, España

     
  2. [2] Instituto de Ciencias de la Tierra Jaume Almera

     Instituto de Ciencias de la Tierra Jaume Almera

     Barcelona, España

     
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 3, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 41-44
• Idioma: español
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• Resumen

  • The calcite mylonites at the base o f the southern Urals accretionary prism present a high density of mechanical twins and dynamical recrystallized grains. Crain size and shape analysis of some calcmylonites were used to estimate palaeostress values, which are ranging between 135 and 229 MPa.

    Since palaeostress based on recristallized grain size are lower than palaeostress obtained previously by twin density (230±40 MPa), the methods constrains are discussed and results are interpreted in accordance with the domain o f different calcite mechanisms during deformation. Both results are consistent with the hypothesis that the recrystallized grains sizes are limited by the twinning field boundary in the deformation mechanism map.