Composition of the lava associated with the flank collapses of the western sector of the La Orotava (Tenerife)

Authors

  • Eumenio Ancochea Dpto. de Mineralogía y Petrología, Universidad Complutense de Madrid
  • María José Huertas Dpto. Mineralogía y Petrología, Universidad Complutense de Madrid
  • Álvaro Márquez Área de Geología, Universidad Rey Juan Carlos, Madrid.
  • Raquel Herrera Área de Geología, Universidad Rey Juan Carlos, Madrid.
  • Juan Jesús Coello-Bravo Museo de Ciencias Naturales de Tenerife, Santa Cruz de Tenerife.

DOI:

https://doi.org/10.55407/geogaceta99924

Keywords:

Tenerife, La Orotava Valley, changes in the volcanic system, volcanic flank collapse

Abstract

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.

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Erupción de La Palma de 2021 (Cumbre Vieja, 19 septiembre a 13 de diciembre de 2021).

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Published

2022-06-06

How to Cite

Ancochea, E., Huertas, M. J., Márquez, Álvaro, Herrera, R., & Coello-Bravo, J. J. (2022). Composition of the lava associated with the flank collapses of the western sector of the La Orotava (Tenerife). GEOGACETA, 71, 75–78. https://doi.org/10.55407/geogaceta99924

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Vol. 71 (2022): Enero-Junio

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