Abstract
Data from fluid inclusions and stable isotopes (O, C, S) have been used to characterize the fluids involved in the peridiapiric mineralization genesis in the Tebessa area. Iron ore mineralization (siderites and ankerites) occurred at temperatures of about 120 °C by substitution of Cretaceous carbonate rocks while epithermal polymetallic mineralization (Pb-Zn, Cu, Ba and F) occurred at relatively higher temperatures ranging from 100 to 250 °C from basinal brines expelled from sedimentary series by different episodes of diapiric activities and by neogen compressions. The carbon of iron carbonates are of mineral origin, they come from the reuse of the carbon in the limestone host rocks. The sulphide sulfur is produced by thermochemical reduction of the sulphates of the Triassic evaporates.
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