La secuencia volcánica submarina del Complejo Basal de La Gomera
- Ramón Casillas Ruiz 1
- Julio de la Nuez Pestana 1
- Carlos Fernández Rodríguez 2
- Encarnación García Navarro 2
- Juan Ramón Colmenero Navarro 3
- María Candelaria Martín Luis 1
- 1 Dpto. de Edafología y Geología. Fac. de Biología.
- 2 Dpto. de Geodinámica y Paleontología, Fac. de Cc. Experimen., Universidad de Huelva
- 3 Dpto Geología, Facultad de Ciencias, Univ. de Salamanca,
ISSN: 1576-5172
Year of publication: 2008
Issue Title: VII Congreso Geológico de España
Issue: 10
Pages: 1273-1276
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The Basal Complex of La Gomera includes volcanic submarine rocks, mainly exposed near Arguamul and Guillama, in particular at the La Higuerita gorge and the Santa Catalina and Arguamul beaches. This bimodal volcanic series is composed of trachytic and basaltic rocks, the latter being more recent than the former. The trachytic rocks form pillow-fragment welded breccias. The basaltic rocks constitute a sequence dipping more than 50o to the SE, with coherent volcanic deposits (pillow-lava flows), resedimented volcanoclastic deposits (pillow-fragment breccias), volcanogenic deposits (volcanic breccias, sandstones and siltstones) and peperites, as a consequence of the intrusion of dikes within poorly lithified volcanogenic deposits. The high proportion of volcanoclastic and volcanogenic layers in these series is indicative of the gravitational instability of the submarine volcanic edifice, a feature already described for the submarine volcanic rocks of the Basal Complex of Fuerteventura. On the contrary, the Basal Complex of La Palma is characterized by the predominance of the primary deposits, such as pillow-lava flows.