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A great wealth of analytical data for fluid inclusions in minerals indicate that the major species of gasesin fluid inclusions are H_2O, CO_2, CO, CH_4, H_2 and O_2. Three basic chemical reactions are supposed toprevail in rock-forming and ore-forming fluids: H_2+1/2 O_2=H_2O, CO+1/2 O_2=CO_2, CH_4+2O_2=CO_2+2H_2O,and equilibria are reached among them. lgf_(O_2)-T, lgf_(CO_2)-T and Eh-T charts for petrogenesis andminerogenesis in the supercritical state have been plotted under different pressures. On the basis of thesechartsf_(o~2), f_(co_2), Eh, equilibrium temperature and equilibrium pressure can be readily calculated. In thispaper some examples are presented to show their successful application in the study of the ore-formingenvironments of ore deposits.
A great wealth of analytical data for fluid inclusions in minerals that that the major species of gases in fluid inclusions are H_2O, CO_2, CO, CH_4, H_2 and O_2. Three basic chemical reactions are considered toprevail in rock-forming and ore-forming fluids: Lgf_ (O_2) -T, lgf_ (CO_2) -T and Eh-T, H_2 + ½ O_2 = H_2O, CO + ½ O_2 = CO_2, CH_4 + 2O_2 = CO_2 + 2H_2O, and equilibria charts for petrogenesis andminerogenesis in the supercritical state have been plotted under different pressures. On the basis of thesechartsf_ (o ~ 2), f_ (co_2), Eh, equilibrium temperature and equilibrium pressure can be readily calculated. In thispaper some examples are presented to show their successful application in the study of the ore-formingenvironments of ore deposits.