Geochronology of the mega-landslides of the last million years in Tenerife. Part II New contributions to knowledge about the landslides
DOI:
https://doi.org/10.21701/bolgeomin.131.4.022Keywords:
age determinations, Canary Islands, geochronology, Tenerife, volcanic mega-landslidesAbstract
The review on the ages available in the bibliography (1972-2019) related to the mega-landslides of the island of Tenerife in the last million years, and the new Ar/Ar ages we have obtained have allowed us to propose the following ages for the landslides of: Icod: ~170 ka; La Orotava: ~560, ~530 y ~500(?) ka; Güímar: ~830 ka; and Micheque: 810-830 ka (Ferrer et al., 2020-this volume). The relationship between the ages of the landslides and the geological and geomorphological evidence that support the flank instability failure processes, based on field observations in outcrops and underground data -from the
galleries excavated through the filling of the landslide valley- are presented. The hypothesis of several overlapping flank landslides, with time intervals of at least several tens of thousands of years is proposed, ruling out the occurrence of single processes of massive and instantaneous failure of the insular flank; thus, in the case of the La Orotava valley, an age of around 530 ka is confirmed for a large landslide, as well as the occurrence of other landslides around 560 ka and 500 ka. The relationship and causality between the Icod landslide, the last one that occurred in Tenerife, and the great explosive eruption at the end of the Cañadas cycle, and not the opposite as some authors have suggested, has also been analyzed, concluding that the explosion was a consequence of the landslide, ~170 ka ago. New data and evidence for the Micheque landslide are shown, indicating a Pliocene age for the deep substrate of the La Orotava and Micheque landslides.
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