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Hondo de Fagaesto, Gran Canaria, Canary Islands.

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Photo ID: 760
Gallery ID: 62
Photo Title: Hondo de Fagaesto, Gran Canaria, Canary Islands.
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Keywords:
hondo de fagaesto, hondo de fagaesto maar, fagaesto, el sao volcanic edifice, el sao, gran canaria, canary islands, macaronesia, atlantic islands, volcanic islands, cinder cone, maar, holocene, rejuvenation stage, phraetomagmatic eruption, strombolian eruption, scoria, vesicular, bombs, lapilli, barranco de los berrezales,
Description:
The Hondo de Fagaesto forms part of the Fagaesto and El Sao volcanic edifice which comprises of a small cinder cone and a maar, seen here in this image. This is a relatively small volcanic edifice believed to be around 3000 years old and is one of several volcanoes of Holocene age, to have erupted along a 9 km long north west to south east fracture zone on the north west of Gran Canaria and which are the latest eruptions associated to the rejuvenation stage of Gran Canaria. Both vents opened up in the bottom of the Barranco del Sao, at an altitude of around 1000 meters and rest on post Roque Nublo lavas which largely covered the north and east of Gran Canaria between 2.9 and 1.45 million years ago. The Hondo de Fagaesto is a maar type circular depression measuring some 250 metres width and 40 metres in depth, and was formed by explosive eruptions involving the interaction of magma and water. (phraetomagmatic eruption) A short distance to the west (to the right, not seen in this image) is the El Sao cone, a small round tephra cone, 90 metres in hight, originating from strombolian eruptions and which is composed of scoria and vesicular bombs and to a lesser degree black lapilli. This volcano emitted a small ‘aa’ lava flow composed of basanite, which flowed down the El Sao valley and then cascaded down into the huge canyon below, the Barranco de los Berrezales. Both eruptive centres originated as strombolian type eruptions forming small cinder cones back to back, the crater being formed later in the sequence as rising magma was to come into contact with an aquifer, setting of a series of explosive phreatomagmatic surges, together with the ongoing strombolian activity, this would explain the layers of intermixed lapilli and phreatomagmatic deposits. Finally the caldera would have formed as the shattered bedrock collapsed in on itself as eruptions ceased.
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