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Macizo de Inagua, Gran Canaria, Canary Islands.

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Photo ID: 677
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Photo Title: Macizo de Inagua, Gran Canaria, Canary Islands.
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Keywords:
macizo de inagua, inagua, gran canaria, canary islands, volcanic islands, atlantic islands, cliffs, mountains, montaña del horno, miocene, miocene rocks, rock formations, caldera de tejeda, shield volcano, ignimbrites, pumice, basalt, tasarte, village of tasarte, barranco tasarte,
Description:
The enormous cliffs in the background culminating in the 1412m high Montaña del Horno are known as the Macizo (massif) de Inagua and are of great interest geologically in that most of the rocks forming the cliffs were deposited inside of the Miocene, 1000m deep, 18 x 28 km wide Caldera de Tejeda, between 14.1 and 12.0 million years ago, finally overflow its flanks completely burying the caldera wall and part of the surrounding original shield volcano. Since then, the area has not been affected by any volcanic activity and the erosion over 12 million years has largely eroded the outer rock formations revealing the intra caldera materials and part of the caldera wall. The first formations, the smooth slopes above the village are composed of basaltic lavas of the original shield volcano that formed the basis of the island of Gran Canaria, these rocks originally having been much higher at this point. At the top of these slopes are the greenish and yellow hydrothermally altered pumice deposits that were deposited on the inside of the outer margins of the caldera, very close to the top of the caldera wall. Above these are some additional 8 layers of intra-caldera eruptive sequences composed of trachytic and rhyolitic ignimbrites. The top 250 metres (the vertical colums) are composed of two thick and several thinner layers of trachy-phonolitic ignimbrites of a younger age, deposited between 12.4 and 12 million years ago, originating from a resurgence of the island’s volcanism comprising of magmas of a chemically different composition and which instead of the eruptions being from ring fractures inside the caldera’s periphery, the focal point of activity moved to the centre of the caldera, with the formation of a high stratovolcano. The village in the foreground is that of Tasarte, located at the head of the Barranco de Tasarte is one of three small villages situated in the remote, rugged and almost unpopulated mountainous area of the extreme south west of Gran Canaria.
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