Deformaciones asociadas al deslizamiento gravitacional de flanco del Edificio Antiguo Inferior en Tazo (La Gomera)

  1. Ramón Casillas Ruiz 1
  2. Carlos Fernández Rodríguez 2
  3. Julio de la Nuez Pestana 1
  4. Encarnación García Navarro 2
  5. Juan Ramón Colmenero Navarro 3
  6. María Candelaria Martín Luis 1
  1. 1 Dpto. de Edafología y Geología. Fac. de Biología. Universidad de La Laguna.
  2. 2 Dpto. de Geodinámica y Paleontología, Fac. de Cc. Experimen., Universidad de Huelva
  3. 3 Dpto Geología, Facultad de Ciencias, Univ. de Salamanca
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2008

Issue Title: VII Congreso Geológico de España

Issue: 10

Pages: 1269-1272

Type: Article

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Abstract

Abstract: The rocks located below the surface of the gravitational slide of Tazo, i.e., the basaltic lava flows, sills and dikes of the Lower Old Edifice and the submarine volcanic rocks, gabbros, piroxenites and dikes of the Basal Complex of La Gomera, are strongly deformed near this sliding surface. Lava flows and dikes of the Lower Old Edifice are folded and brecciated, and a cataclasite, locally foliated, defines the sliding surface. The dikes of the Basal Complex also appear folded, and gabbros and piroxenites are affected by a large number of small faults. The sliding surface is defined in the Basal Complex by a cataclasite showing an incipient fracture cleavage. It is here suggested that the collapse of the northwestern flank of the Lower Old Edifice at Tazo could have been partly triggered by the displacement along the Montaña de Alcalá and Guillama normal faults that are deeply entrenched in the rocks of the Basal Complex.

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