Kiruna porphyry
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Kiruna Porphyry (Swedish: Kirunaporfyr) is a group of igneous rocks found near Kiruna in northernmost Sweden.[1] The Kiruna Porphyry formed 1,880 to 1,900 million years ago during the Paleoproterozoic Era.[1] In detail various rock types are distinguished in the Kiruna Porphyry such as trachyandesite lava and quartz-bearing porphyry of rhyolitic composition.[1] The former is found on the foot wall of the Kiruna iron ore body, while the latter is found in the hanging wall.[1] Part of the quartz-bearing porphyry is tought to be ignimbrite.[1] The Happaranda Series of rocks found near the Finnish border are tought to have the same origin as the Kiruna Porphyry.[2]
References
- ^ a b c d e Lundqvist, Thomas (2009). Porfyr i Sverige: En geologisk översikt (in Swedish). pp. 24–25. ISBN 978-91-7158-960-6.
- ^ Brewer, T.S.; Pharao, T.C. (1990). "Earyl Precambrian basic rocks of the Baltic Shield". In Hall, R.P.; Hughes, D.J. (eds.). Early Precambrian Basic Magmatism. Blackie. p. 291.
Category:Geology of Sweden Category:Kiruna Category:Paleoproterozoic volcanism
Kiruna Porphyry
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