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Study reveals mineral composition in cupriferous sandstones from southeastern Perm Krai, suggesting local sources.
Studies of cupriferous grey-colored sandstones in the southeast of the Perm Krai (villages of Aspa, Ashap, Yug) have been conducted. Sandstone is composed of apovolcanogenic flints and chalcedonies (up to 95%); quartz up to 5%. The composition corresponds to greywacke. The heavy-mineral fraction is dominated by chloritized biotite, magnetite, and zircon; titanite and spessartine crystals are common. Zircon, titanite, and spessartine are of the same type, with no signs of mechanical wear. We assume that the sources of the material were local, possibly related to the Early Permian tectonic magmatic activation.
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Kisin et al. (2025) studied this question.
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