Abstract
Transport of Pb and Zn by carboxylate complexes in basinal ore fluids and related petroleum-field brines at 100°C: the influence of pH and oxygen fugacity.
Highlights
It is well established through field observations, experiments, and chemical models that oxidation state and pH exert a strong influence on the speciation of dissolved components and the solubility of minerals in hydrothermal fluids
Examination of the Pb isopleths in Fig. 2 shows that sufficient lead in the model ore fluid can only be transported under log fO2–pH conditions corresponding to low total sulfide (SmSO4 the relatively oxidized RBRBM ore fl&uidSmoHf 2GS)i;ofrodranexoa76mapnled, the Mississippi Valley-type (MVT) ore fluid of Anderson.[37]
(1) A comparison of dissolved Pb, Zn and sulfur content of modern petroleum-field brines with Pb and Zn solubility systematics in log fO2–pH space for the composite ore-brine in this study reveals good correlations between modern brinetypes and proposed ore fluid models for Mississippi Valley-type deposits and red-bed related base metal deposits
Summary
It is well established through field observations, experiments, and chemical models that oxidation (redox) state and pH exert a strong influence on the speciation of dissolved components and the solubility of minerals in hydrothermal fluids. These parameters are known to act as major constraints on the stability of specific minerals and mineral assemblages in hydrothermal systems and to control sulfur and carbon isotope systematics in these systems. Zn2zzCH3COO{?Zn(CH3COO)z is directly influenced by pH through the control of acetate activity by protonation, CH3COO{ zHz? In this model total acetate and total malonate concentrations are independent of total carbonate
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