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Northern Sweden is dominated mainly by Paleoproterozoic rocks. Igneous activity during the Svecofennian orogeny (1.93-1.87 Ga) created vast amounts of both volcanic and plutonic rocks within and around the Archaean craton. Post-orogenic 1.80-1.77 Ga granitoids were formed later within the same region, it has Distinguishing between the different mafic and ultramafic members of such plutonie suites...
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