Tectonically induced distorsion of stratigraphic cycles: example of the Arguis anticline in the South Central Pyrenees (Spain)

• S. Castelltort ^[1] ; F. Guillocheau ^[1] ; T. Nalpas ^[1] ; D. Rouby ^[1] ; C. Robin ^[2] ; M. de Urreiztieta ^[3] ; I. Coutand ^[1]
  1. [1] Géosciences Rennes
  2. [2] Université Paris
  3. [3] Elf EP

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 2, 2000 (Ejemplar dedicado a: IV Congreso del Grupo Español del Terciario (Tremp, 19-21 septiembre, 2000)), págs. 55-58
• Idioma: inglés
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• Resumen

  • The distorsion of stratigraphic cycles refers to a variation in the symetry of the cycles, i.e. a variation of the ratio between progradation and rétrogradation. Short wave-lenght growth tectonic structures, like growth folds, generate local variations in the subsidence field, and therefore potential perturbations of the stratigraphic signal. The influence of such tectonic structures on the sequential architecture of syntectonic deposits has not yet been studied. We present here the conceptual basis for a tectonic induced distorsion of stratigraphic cycles, and examine the field example of the Eocene deltaic syntectonic deposits of the Arguis anticline (South Central Pyrennees, Spain). The good correspondence between the théorie predictions and the field case studied, allows us to propose this type of distorsion as an additionnai tool for predictive sequence stratigraphy in syntectonic sedimentation settings. For structural investigations, our approach also shows that non-uniform variations of the thickness of growth strata can record a constant rate of development of the structure, taking in account the cyclic nature of the sedimentary record.