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Scapolite-bearing orthogneisses underlying the Proterozoic Varena Iron Ore Deposit, eastern Lithuania, the western East European Craton, represent the development of a sodic alteration zone. Scapolite chemistry records fluid salinity increase with temperature, reaching its maximum at temperatures of ∼750 °C. Fluid-mineral reactions controlled the fluid KCl/NaCl ratio, enabling partial melting at p
