Metallogeny of Finnmark, North Norway
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Metalliferous ore deposits and mineralisations in the county of Finnmark occur in rocks ascribed to three specific periods of geological time: 1) Archaean 2) Early Proterozoic 3) Caledonian. The only Archaean ore deposits is located at the largest iron mine in Norway, Sydvaranger; this was deposited in a shelf environment. The Early Proterozoic volcano-sedimentary belts can be divided into three major metallogenetic provinces. In the easternmost Pasvik area no significant deposits are known and only a few minor nickel mineralisations are present. The rocks of the Karasjok Greenstone Belt are thought to have accumulated during a complete \"Wilson orogenic cycle\" and contain both stratiform and stratabound copper deposits, banded iron formations and nickel mineralisations. A continental rifting model is more likely for the rocks of the Kautokeino Greenstone Belt and for correlative units in the tectonic windows to the northeast. Stratabound copper deposits are dominant, occurring in both metavolcanites and metasediments, but gold, uranium and REE minerali- sations are also found. This province includes the second operating ore mine in Finnmark at present, the Bidjovagge copper-gold mine. The Caledonian province contains lead deposits in both amphibolite-facies and very low grade metasandstones and Fe-Ti occurrences in mafic and ultramafic intrusive bodies in the Seiland magmatic province.