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Roques de Tenteniguada, Gran Canaria, Canary Islands.

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Photo ID: 901
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Photo Title: Roques de Tenteniguada, Gran Canaria, Canary Islands.
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Keywords:
roques de tenteniguada, gran canaria, canaria islands, atlantic islands, oceanic islands, macaronesia, tephri-phonolite, phenocrysts, sanidine, intrusion, intrusive dome, roque nublo volcano, tenteniguada formation, lava, magma, volcano, stratovolcano, geochemical differentiation, crystallization, fissure, fault, rift, dike, sill, feeder vent, tenteniguada depression,
Description:
Located along the steep escarpment of the Tenteniguada depression, near to the north eastern edge of the island’s easternmost highlands, the Roques de Tenteniguada are a series of volcanic domes and plugs that form part of a significant number of igneous intrusions to be found on the island of Gran Canaria, Canary Islands, forming part of the Roque Nublo volcano’s Tenteniguada Formation. These intrusions formed more or less around the periphery of the statovolcano’s central emission area, in the centre of the island and represent the culmination of two separate periods of geochemical differentiation of its magmas, the first between 3.9 and 3.8 million years ago, marking the beginning of a period when the volcano’s activity was to become dominated by highly explosive eruptions and the second between 3.1 and 2.7 million years ago during the waning stages of the volcano’s activity. The two largest intrusions in this image (centre and right) are eroded from a single intrusive body and are known as the Roque Grande, which measure 160 metres from its base. The rock is composed of a tephri-phonolite of a light greenish grey colour with large phenocrysts of sanidine. The intrusion is dated as 3.11 million years old and was formed during the waning stages of the Pliocene, Roque Nublo volcano’s activity. An igneous intrusion is a body of molten magma that has risen toward the surface of the earth, forcing its way through fissures or faults until reaching the surface. These may be small fissure sized intrusions which when made visible by erosion are called dikes, or they may force apart the rock structures and form huge dome shaped bodies of rock. Many intrusions reach the surface and act as the feeder vents for volcanic eruptions and have lava flows associated to them. Others may fail to reach the surface as a result of a decline in the magma supply and crystallize below ground (cooling and solidifying completely). Millions of years later, these intrusions become exposed by the erosion and / or gravitational collapse of the surrounding rocks (as is this case) and form spectacular pillars or towers of rock.
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