Aproximación al comportamiento geotécnico de las Ignimbritas "ash and pumice" a partir de análisis químico-mineralógicos

• A. González Losa ; F.J. Pérez Torrado ^[1] ; A. Lomoschitz Mora Figueroa ^[1]
  1. [1] Universidad de Las Palmas de Gran Canaria

     Universidad de Las Palmas de Gran Canaria

     Gran Canaria, 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. 293-295
• Idioma: español
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• Resumen

  • Geological factors controlling the engineering properties of the Miocene (ca. 8,3 Ma) ash and pumice phonolitic ignimbrites in Gran Canaria island have been analysed. Emphasis has been placed on the influence of chemical and mineralogical changes on the strength and deformation properties. Optical microscopy, X-ray diffraction and X-ray fluorescence techniques have been used for characterization of the geochemistry and mineralogy of these pyroclastic flow deposits. Several physical and mechanical tests (classification tests, uniaxial compression, etc.) have been carried out to determinate the geotechnical behaviour. The alteration degree o f vitreous phase is the most important factor for explaining the decrease of quality in the geotechnical properties of these soft rocks.