Volcanogenic quartz-magnetite-hematite veins, Snowdon, North Wales
1991 ◽
Vol 55
(379)
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pp. 257-262
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AbstractIn 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.
2020 ◽
Vol 50
(1)
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pp. 237-250
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1968 ◽
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