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Volcanogenic quartz-magnetite-hematite veins, Snowdon, North Wales
Published online by Cambridge University Press: 05 July 2018
Abstract
In the Ordovician Snowdon Volcanic Group caldera quartz-magnetite-hematite-pyrite assemblages occur in a breccia vein in rhyolitic tuff and vein swarms in basalt. The veins developed pre-cleavage. Elevated levels of tin and tungsten in the veins, and of fluorine in the wall rocks, suggest a magmatic contribution to the mineralising fluids. The chemistry of the veins differs from that of the base-metal sulphide veins found elsewhere in the caldera.
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- Copyright © The Mineralogical Society of Great Britain and Ireland 1991
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