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The Paleoproterozoic, synvolcanic Ni-Cu sulfide deposits at Pechenga are hosted by conformable, sill-like ferropicritic differentiated intrusions, injected into carbonaceous and sulfidic graywackes and shales of the Productive Formation. Due to the presence of abundant sulfides in the country rocks, assimilation of S-rich sedimentary material has commonly been attributed as the most significant factor that triggered sulfide immiscibility and led to the formation of the Pechenga ores. Several Ni-Cu sulfide prospects are associated with a ferropicritic dike system that transects the thick pillow lava succession of the Kolosjoki Volcanic Formation underlying the mentioned sedimentary unit, showing that the magma was...

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