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Clays and Clay Minerals

, Volume 53, Issue 3, pp 250–267 | Cite as

Clay Mineralogy and Chemical Composition of Bentonites from the Gourougou Volcanic Massif (Northeast Morocco)

  • Mohamed Ddani
  • Alain MeunierEmail author
  • Mohamed Zahraoui
  • Daniel Beaufort
  • Mohamed El Wartiti
  • Claude Fontaine
  • Boubker Boukili
  • Benacer El Mahi
Article

Abstract

The Gourougou volcanic massif (northeastern Morocco) is actively prospected for bentonite deposits. Five bentonites originating from different environments were selected for the present study: hydrothermal alteration of obsidian perlite glass inside the volcanoes themselves (Providencia and Tribia deposits); alteration of pyroclastic flows in a marine shallow water to lagoonal lacustrine environment (Ibourhardayn deposit); ash falls in marine or lacustrine systems (Moulay Rachid and Melg el Ouidan (formerly Camp Berteau) deposits). All of these bentonites were probably formed from volcanic glass originating from a rhyolitic magma at different stages of differentiation as shown by slight variations of REE and incompatible element abundances. The crystal-chemical characteristics of the smectite vary according to alteration conditions: beidellite predominates in hydrothermal systems, whereas montmorillonite predominates in lagoonal and lacustrine environments, and mixed-layer beidellite-montmorillonite in the sea-water-altered pyroclastic flows. All these dioctahedral smectites exhibit a heterogeneous distribution of charge as shown by the presence of partially expandable (1 EG) or non- expandable (0 EG) layers in the K-saturation state. The proportion of the collapsed or partially expandable layers is not related to the average layer charge or to the cation exchange capacity. This militates for an overall heterogeneous charge distribution. Compared to other natural or experimental alteration systems of similar rhyolitic glass, the formation of beidellite or montmorillonite appears to be controlled by the amounts of Mg in the system.

Key Words

Alteration CEC Layer Charge Smectite Volcanic Glass 

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Copyright information

© The Clay Minerals Society 2005

Authors and Affiliations

  • Mohamed Ddani
    • 1
    • 2
  • Alain Meunier
    • 1
    Email author
  • Mohamed Zahraoui
    • 2
  • Daniel Beaufort
    • 1
  • Mohamed El Wartiti
    • 2
  • Claude Fontaine
    • 1
  • Boubker Boukili
    • 2
  • Benacer El Mahi
    • 2
  1. 1.HYDRASA-UMR 6532 CNRSUniversité de PoitiersPoitiersFrance
  2. 2.Faculté des Sciences Agdal, Département de Sciences de la TerreLaboratoire de Géologie appliquée, Université Mohammed VRabatMorocco

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