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Roque Bentaiga, Gran Canaria, Canary islands.

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Photo ID: 794
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 1415 metre high 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 topmost vertically structured rocks). In the foreground to the extreme right are the highly eroded remains of the inside of the crater belonging to the Cuevas del Rey strombolian cone, which is believed to have measured 1 km in diameter. The red rock is composed of a mixture of intra crater lapilli, breccias, debris, scoria and bombs, these vivid red tones created by the oxidisation of iron within the rocks by the residual hot, water vapour rich gases escaping from the crater after the eruptions had ceased. The remains of the Cuevas del Rey formation are also cut by basaltic and phonolitic dikes of Roque Nublo age, one of these dikes being clearly seen in this image on the right.
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