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The forgotten eruption: The basaltic scoria cone of Montaña Grande, Tenerife

Fig. 2
Fig. 2. Satellite view of the studied area highlighted the main geographic features described in the text. Orange dots represent stratigraphic sections identified, measured and described around the cone of Montaña Grande (MG); yellow dots are site where samples for paleomagnetic datings have been recovered. The white dashed line indicates the rims of the area where eolic sands cove the lava flow. Image from Google Maps, 2019. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

Di Roberto A., G. Risica, P. Del Carlo, M. Pompilio, F. Speranza, S. Meletlidise (2020).
Journal of Volcanology and Geothermal Research, 401,


We report on the Strombolian to Violent Strombolian eruption of Montaña Grande which occurred between 789 and 725 BCE in the Güimar Valley on the NE flank of Tenerife island. The eruption produced a ca. 180 m-high scoria cone, a thick fallout deposit mostly dispersed southwest and a vast lava flow field that extends east of the cone, towards the coast, for 3.3 × 2.2 km. The eruption occurred in an unusual geodynamic context, outside the North West Rift and North East Rift zones and out of Las Cañadas caldera which are the main geological structures of Tenerife, where the volcanic activity concentrated during the Holocene. The tephra and lava have a trachybasalt composition similar to products of the recent activity of Tenerife but characterized by a distinct trace element pattern (Ta depletion relative to Nb), that points to a distinct source for the magma feeding the eruption and an ascent history along the whole crust which is independent and different from the central feeding system of the Teide-Pico Viejo volcanic complex. The study of this eruption, which until now had been completely neglected, adds new significant data for the correct definition of volcanic risk in Tenerife.