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Montaña de Pico de Galdar, Gran Canaria, Canary Islands.

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Photo ID: 750
Gallery ID: 62
Photo Title: Montaña de Pico de Galdar, Gran Canaria, Canary Islands.
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Keywords:
montaña de pico de galdar, galder, pico de atalaya, gran canaria, canary islands, macaronesia, atlantic islands, volcanic islands, atlantic ocean, ocean, sea, oceanic islands, volcano, cone, volcanic cone, cinder cone, eruption, explosive eruption, strombolian eruption, explosion, pyroclastic, lapilli, cinder, magma, lava, lava flow, nephelinite, olivine, pyroxene, augite, seawater,
Description:
The 284 metre high Montaña de Pico de Galdar, named after the town which has been built around its base, is also known as the Pico de Atalaya and is one of a number of small monogenetic volcanoes located along the north and north east of the island of Gran Canaria. The pyroclastic cone was formed by a strombolian type eruption from a single volcanic vent. The large volume of lapilli ejected and the very large dispersal area of this pyroclastic material suggest that the eruption was highly explosive, possible as a result of the interaction of seawater seeping into its feeder dikes. The cone itself is also unusual in that the lapilli is strongly welded together. Lava flows from the base of the volcano reached the sea to the north, it is however unknown, if any lavas flowed south since the whole area is covered by thick layers of pyroclastics. The highly silica undersaturated lavas are of a nephelinitic composition with a microcrystalline matrix rich in olivine and augite, with abundant olivine phenocrysts which are in large part altered (oxidised) to iddingsite. A nephelinite lava flow from the eastern flank of the volcano has been dated as 1.35 million years old.
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