Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/46261
Título: The Plio-Quaternary volcanic evolution of Gran Canaria based on new K-Ar ages and magnetostratigraphy
Autores/as: Guillou, Hervé
Torrado, Francisco José Perez 
Hansen Machín,Alex Roberto 
Carracedo, Juan Carlos 
Gimeno, Domingo
Clasificación UNESCO: 250621 Vulcanología
Palabras clave: Gran Canaria (Canary Islands
K–Ar geochronology
Magnetic stratigraphy
APTS
Gauss–Gilbert, et al.
Fecha de publicación: 2004
Editor/a: 0377-0273
Publicación seriada: Journal of Volcanology and Geothermal Research 
Resumen: The combined use of radiometric dating (51 new unspiked K–Ar ages), magnetostratigraphy and field geology establishes a new time framework for the last two stages of the volcanic evolution of Gran Canaria. Most of the dated samples have ages coherent with their stratigraphic positions and magnetic polarities. Our new set of data extends the end of the Roque Nublo (RN) group, one of the main posterosive stages of Gran Canaria which started about 4.9 Ma ago, to ages as young as 2.87 Ma. This is about 0.7 Ma younger than previously thought. Moreover, the dating of samples collected in well-defined stratigraphic sequences supports the contemporaneity of the early stages of the post-Roque Nublo group and the vanishing activity of the Roque Nublo stratovolcano between 3.7 and 2.9 Ma. The multiple lateral collapses of the Roque Nublo stratovolcano occurred during this period between 3.5 and 3.1 Ma which corresponds to a main period of volcanic quiescence. After 2.9 Ma, the effusive activity propagated along a well-defined NW–SE rift until about 1.5 Ma, shifting progressively from a rifting propagation to platform-forming lavas. Thereafter, the activity is very disperse and belongs to the Brunhes period, with most of it before 500 ka.
URI: http://hdl.handle.net/10553/46261
ISSN: 0377-0273
DOI: 10.1016/j.jvolgeores.2004.03.003
Fuente: Journal of Volcanology and Geothermal Research [ISSN 0377-0273], v. 135, p. 221-246
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