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Melilite-nephelinite volcanic dike, Gran Canaria, Canary Islands.

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Photo ID: 885
Gallery ID: 62
Photo Title: Melilite-nephelinite volcanic dike, Gran Canaria, Canary Islands.
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Keywords:
melilite nephelinite volcanic dike, volcanic dike, feeder dike, gran canaria, canary islands, pico de las nieves, cruz de tejeda, los pecho formation,
Description:
On the highly eroded island of Gran Canaria, the erosion has revealed hundreds of volcanic dikes all over the island, some dating back to the very beginning of the island’s formation some 14.5 million years ago These dikes are the result of intrusions of rising magma into fissures or faults within the islands rocks and can range from a few centimeters to many metres in width. In many cases they remain below ground gradually crystallizing (cooling and solidifying) into solid rock, whilst in many other cases they actually become the feeder sources for volcanic eruptions. This particular dike is very large measuring up to 2 metres in width and up to 8 metres tall on its northern more eroded side and over 1 km in length, running west north west to east south east. It is situated on the northern rim of the central eastern highlands to the north side of the road from Pico de Las Nieves to Cruz de Tejeda, close to the turnoff to Telde. The rocks have been dated as 1.79 million years old and belong 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.
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