Edades 39 Ar/40 Ar de los depósitos de Roques de García (Las Cañadas, Tenerife)

Abstract

During the evolution of the Las Cañadas volcanic edifice, debris avalanches were very significant destructive events. The Roques de Carcia unit was generated by such an evento 39Ar/40Ar dating has been carried out on different rock types related to this deposito 1.70-1.40 Ma ages were measured on volcanic material involved in the avalanche deposit, 0.43 Ma on a phonolitic dyke cutting this formation. These results bracket the age of the debris avalanche emplacement which could mark either the transition between Cañadas II-Cañadas III (1.4-1.1 Ma) or Cañadas IIIa-Cañadas IIIb (0.6-0.7 Ma) volcanic phases.