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Trachy-rhyolitic ignimbrite U, Anden Verde, Gran Canaria, Canary

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Photo ID: 472
Gallery ID: 58
Photo Title: Trachy-rhyolitic ignimbrite U, Anden Verde, Gran Canaria, Canary
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Keywords:
trachy-rhyolitic ignimbrite u, anden verde, gran canaria, canary islands, caldera de tejeda, miocene rocks, welded ignimbrite, strongly welded, fiamme, oligoclase, na-anorthoclase, clinopyroxene, hypersthene, fe/ti oxide, phenocrysts,
Description:
Rock sample from a 10m thick trachy-rhyolitic, very strongly welded ignimbrite so far known only from the Anden Verde and hogarzales-Cedro area of Gran Canaria and dated as 13.94 million years old. This ignimbrite contains a basal vitrophyre with well developed fiamme. It contains sparse oligoclase, Na-anorthoclase, clinopyroxene, hypersthene and Fe/Ti oxide phenocrysts. Ignimbrite U is interpreted as having been deposited at very high temperatures. The rock is of a pale grey-violet colour. (Geological Field Guide, Gran Canary – H.U Schminke) SiO2 – 68.60%, Al2O3 – 14.81%, Fe2O3 – 2.70%, FeO – 0.60%, MgO – 0.58%, CaO – 1.40%, Na2O – 5.49%, K2O – 3.58%, MnO – 0.18%, TiO2 – 0.83%, P2O5 – 0.17%, H2O – 0.60%, CO2 – 0.16
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