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Arvidsjaur porphyryArvidsjaur porphyry (Swedish: Arvidsjaurporfyr) is a group of igneous rocks of intermediate to felsic composition found near Arvidsjaur in northern Sweden.[1] The Arvidsjaur Porphyry formed 1,870 to 1,880 million years ago during the Paleoproterozoic Era.[1] Most of the porphyry have well-preserved primary structures and textures which have allowed to interpret much of Arvidsjaur porphyry to be ignimbrites.[2] While much of the porphyryry have rhyolite compositions some parts that are interpreted as lava flows are made up of andesite with plagioclase phenocrysts.[1] References
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