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Melilite-nephelinite rock sample, Gran Canaria, Canary Islands.

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Photo ID: 547
Gallery ID: 60
Photo Title: Melilite-nephelinite rock sample, Gran Canaria, Canary Islands.
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Keywords:
melilite nephelinite rock, olivine-melilites, intrusive dike, volcanic dike, feeder dike, gran canaria, canary islands, pico de las nieves, cruz de tejeda, los pecho formation, phenocrysts, olivine, pyroxene, xenolith, dunite,
Description:
Close up image of the melilite-nephelinite rock from an intrusive dike situated on the northern rim of the central eastern highlands of Gran Canaria, to the north side of the road from Pico de Las Nieves to Cruz de Tejeda, close to the turnoff to Telde. A sample from this dike has been dated as 1.79 million years old, (McDougall & Schmincke) and belongs to the “Los Pechos” formation, which during the period between 1.5 and 1.8 million years ago erupted a thin veneer of rare Melilite-nephelinite lavas around the highest points of Gran Canaria. Melilite-nephelinite is of a very rare type of lava of ultra-basic composition and of very low silica content, having undergone no differentiation at all during its rise to the surface. The rock contains phenocrysts of olivine and pyroxene, with occasional xenoliths of dunite. Owing to the abundance of olivine phenocrysts, these rocks have been said to correspond more realistically to olivine-melilites (ITGE, Geological map of Spain, San Bartolome de Tirajana) The rock also contains nodules of un-melted Peridotite brought up from the Earth’s mantle. SiO2 – 37.20%, Al2O3 – 9.30%, Fe2O3 – 4.52%, FeO – 7.96%, MgO – 13.70%, CaO – 14.40%, Na2O – 3.40%, K2O – 1.40%, TiO2 – 3.77%, P2O5 – 1.39%
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