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Roque Bentaiga, Gran Canaria, Canary islands.

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Photo ID: 792
Gallery ID: 62
Photo Title: Roque Bentaiga, Gran Canaria, Canary islands.
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Keywords:
roque bentaiga, gran canaria, canary islands, macaronesia, atlantic islands, oceanic islands, volcanic islands, volcanic monolith, caldera de tejeda, shield volcano, stratovolcano, roque nublo volcano, roque nublo breccia, lava flow, pyroclastic breccia, ignimbrite, strombolian cone, fissure vent, strombolian cone, extensive erosion, volcanic cycle, erosive cycle, cone sheet, syenite, ignimbrites,
Description:
During the Roque Nublo volcanic cycle lasting from 5.3 to 2.87 million years ago, this event was to build a very large stratocone in the centre of the island. The eruptions began with emissions of lava flows of basaltic, basanitic and later tephritic composition, then at around 3.9 million years the eruption became highly explosive, emitting a series of non-welded lithic rich ignimbrites; the Roque Nublo breccias. Also during this period, sometime between 3.9 and 3 million years ago, a number of small strombolian eruptive centres had formed on the flanks of the central stratovolcano. One of these, the most important one and which forms part of an alignment of three eruptive cones along a fissure on the south-western flanks, is the Cuevas del Rey eruptive center, located just below where the Roque Bentaiga stands today, forming part of the Three Kings (not seen in this image) This image is of the Roque Bentaiga, which is composed of eroded lava flows emitted from the main Roque Nublo stratocone (the horizontal layers and very clearly visible) and capped by Roque Nublo pyroclastic breccias. The underlying rock formations which form the base of this monolith, are geologically very complex since the Roque Bentaiga and the Cuevas del Rey cone, stand exactly on top of the focal point of the previously emplaced plutonic syenites and cone sheet intrusions. The formations below are comprised of layers of fallout pumice, epiclastic materials and the Miocene Caldera de Tejeda intra caldera ignimbrites (13.97 – 13.3 my), which were intruded into by syenite stocks and are criss-crossed by numerous dikes both of younger Roque Nublo age and of the previous cone sheet formation. This entire area is believed to have been structurally uplifted by as much as 1400 metres by the cone sheet swarm. Interestingly there are also breccias that seem to correspond to an older eruptive centre, although no evidence of this centre has ever been found. If it were to have existed, then all the materials emitted have been completely eroded away. Some of the lower outcrops of solid rock are syenites.
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