Trazas de minerales evaporíticos en el Albiense superior de Bi Haizpeak / Dos Hermanas (Aralar, Nafarroa): implicaciones paleotectónicas

• Lertxundi, D. ^[1] ; García-Mondéjar, J. ^[1]
  1. [1] Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Leioa, España

     
• Localización: Geogaceta, ISSN 0213-683X, Nº. 22, 1997 (Ejemplar dedicado a: 22ª Sesión Científica, Bilbao 1997), págs. 101-104
• Idioma: español
• Títulos paralelos:
  • Evaporitic traces in the Upper Albian of Bi Haizpeak / Dos Hermanas (Aralar, Nafarroa): palaeotectonic implications
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• Resumen

  • Petrographic analysis of a thin (50 cm) bed from the Upper Albian Bi Haizpeak/Dos Hermanas (Aralar) unit, has shown signs and traces of evaporitic minerals. These features mainly consist of gypsum inclusions, micritic teplacements of gypsum crystals, and authigenic quartz cristals with anhidrite and gypsum inclusions. This is the first reference to Albian evaporites in the Basque-Cantabrian Basin, wihch, on the other hand, were formed in a general humid climate. We attribute these sulphate minerals to anomalous sedimentary conditions, related to a pulse of local ascension of Keuper salt through synsedimentary faults.