Origin of Ore-Forming Brines in Sediment-Hosted Zn-Pb Deposits of the Basque-Cantabrian Basin, Northern Spain

      Fluid inclusion data (microthermometry and Na-K-Li-Cl-Br chemistry) from Mississippi Valley-type Zn-Pb deposits in the Basque-Cantabrian basin, north Iberian Peninsula, indicate that fluid mixing occurred during mineralization. Cl/Br ratios of the ore-forming brines suggest that the high salinity was primarily acquired by evaporation of seawater. Only in deposits near salt domes (Ordu

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