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Mirador Helechal, Hauyne-phonolite rock sample, Gran Canaria.

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Photo ID: 448
Gallery ID: 59
Photo Title: Mirador Helechal, Hauyne-phonolite rock sample, Gran Canaria.
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Keywords:
mirador helechal, gran canaria, canary islands, hauyne-phonolite rock, hauyne, phonolite, lava, magma, igneous rock, igneous intrusion, roque nublo volcano, porphyritic rock, matrix, feldspathoid, clinopyroxine augite, sphene, apatite, hornblende, biotite, alkali feldspar, phenocrysts, sanidine,
Description:
Close up image of the highly evolved alkaline hauyne-phonolite rock, which forms the Mirador del Helechal igneous intrusive dome, located to the north west of the town of Valsequillo. This 160 metre high dome shaped rock is one of a significant number of intrusions to be found on the island of Gran Canaria. 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. This rock formation forms part of the latter intrusions. The rock is a fine-grained porphyritic rock of a satin dark-grey colour. The matrix is composed of the feldspathoid Hauyne and of the clinopyroxine augite, and of sphene, apatite, hornblende and biotite. This rock is distinguished from all other hauyne-phonolite rocks by the few, but very large sized alkali feldspar phenocrysts of sanidine, which may be as large as 3 cm (in this example the one on the right is 24 mm long) SiO2 - 51.55%, Al2O3 – 19.30%, Fe2O3 – 2.02%, FeO – 2.73, MgO – 1.24%, CaO – 3.28%, Na2O – 10.95%, K2O – 5.13%, MnO – 0.19%, TiO2 – 1.26, P2O5 – 0.25%, H2O – 1.51%.
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