Modelización numérica del plegamiento de capas oblicuas a la dirección de extensión

• Albert Griera ^[1]
  1. [1] Universitat Autònoma de Barcelona

     Universitat Autònoma de Barcelona

     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. 61-64
• Idioma: español
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • Folds with axes parallel to the local extension direction are a common feature of naturally deformed rocks, but there are few theoretical, experimental or numerical studies which consider the mechanical viability o f development of these buckle folds. The influence of fold axes inclination respect to the extension direction (X) was numerically modelled for single-layer models. Elastic-viscous linear and non linear materials have been adopted for simulated rock rheology. The numerical simulations highlight several interesting effects of folding dynamics. Active buckle folds can develop with axes sub-parallel to the local stretching direction, although fold axes rotation origin a decrease o f the current growth rate and a linealization of fold geometry for non-linear materials. For linear viscous rheology, the fold finite shape is directly related with the sectional strain ratio. Modelled results are used to inferred a coherent explanation to field observations in the Hercynian Belt o f the Cap de Creus.