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Miocene caldera wall, Barranco de Agaete, Gran Canaria.

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Photo ID: 748
Gallery ID: 62
Photo Title: Miocene caldera wall, Barranco de Agaete, Gran Canaria.
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Keywords:
miocene, caldera wall, caldera de tejeda, felsic ignimbrites, miocene basalts, barranco de agaete, gran canaria, canary islands, atlantic islands, atlantic ocean, oceanic islands, macaronesia, volcanic islands, canyon,
Description:
View of the miocene Caldera de Tejeda wall (centre right of image) on the southwestern side of the Barranco de Agaete, located in the north west of Gran Canaria. The most dramatic event in the volcanic history of Gran Canaria occurred 14.1 million years ago, when a cataclysmic volcanic explosion sent 85 cubic kilometres of ash, rock fragments and burning clouds of pulverised magma into the air, covering 400 Km2 of the island in a composite rhyolitic – trachytic – basaltic ignimbrite. Following this, the island’s summits collapsed into the now empty magma chamber, creating an elliptical caldera estimated to have been 17 x 20 kilometres in size and 1000 metres deep. Over the next million years, up until some 13 million years ago, explosive eruptions continued, filling in and overflowing the caldera with up to 20 layers of highly differentiated felsic trachytic and rhyolitic ignimbrites and lava flows. The caldera wall is visible in this image at the centre right, dipping down some 45º. To the rights are layers of Miocene pre caldera basaltic lavas, to the left and above the caldera wall are layer upon layer of felsic ignimbrites, ash flows and lavas, which constitute the post caldera in fill.
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