Composición de las lavas asociadas a los colapsos de flanco del sector occidental del Valle de La Orotava (Tenerife)
- Eumenio Ancochea 1
- María José Huertas 1
- Álvaro Márquez 2
- Raquel Herrera 2
- Juan Jesús Coello Bravo 3
- 1 Departamento de Mineralogía y Petrología. Facultad de Ciencias Geológicas. Universidad Complutense de Madrid, Ciudad Universitaria, Madrid
- 2 Área de Geología, Universidad Rey Juan Carlos (URJC), Móstoles, Madrid
- 3 Museo de Ciencias Naturales de Tenerife, MUNA, Santa Cruz de Tenerife
ISSN: 0213-683X
Datum der Publikation: 2022
Nummer: 71
Seiten: 75-78
Art: Artikel
Andere Publikationen in: Geogaceta
Zusammenfassung
The lava flows from two water galleries excavated in the La Orotava valley that drill the infilling sequence of the depression generated after the massive flank collapse of La Orotava (OL) and the two smaller flank collapses (WO-1 and WOL-2) have been analyzed. Especially the lava flows located immediately above and below the avalanche deposits associated with the WOL-2 (the U-DAD). They are mostly basanites, with some more evolved rocks (trachybasalts and basaltic trachyandesites). From their chemical characteristics, they all seem to belong to the same magmatic system and linked together by simple fractionation processes of clinopyroxene and, to a lesser extent, olivine.After the WOL-2 flank collapse, the rocks are, in general, less evolved, somewhat more alkaline, and often very rich in mafic phenocrysts.