1989
DOI: 10.1016/0169-1368(89)90017-6
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A chemical model for the concentration of gold in volcanogenic massive sulphide deposits

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Cited by 139 publications
(64 citation statements)
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“…Gold associated with the sulfides was probably transported as AuCI-2 , in a high-temperature, relatively oxidized fluid acid, where precipitation occurs due to an increase of the pH, a decrease of the f0 2 or of the activity of CI-and a decrease in temperature (Huston & Large, 1989), in the same way as it occurs in the highest levei of the exhalative process in the oceanic floor.…”
Section: Cordierite-anthophyllite Rocksmentioning
confidence: 99%
“…Gold associated with the sulfides was probably transported as AuCI-2 , in a high-temperature, relatively oxidized fluid acid, where precipitation occurs due to an increase of the pH, a decrease of the f0 2 or of the activity of CI-and a decrease in temperature (Huston & Large, 1989), in the same way as it occurs in the highest levei of the exhalative process in the oceanic floor.…”
Section: Cordierite-anthophyllite Rocksmentioning
confidence: 99%
“…4A, B). Formation of cinnabar, Ag-sulfides, and sulfosalts from reduced percolating fluids associated with those reduced lithologies involved desulfurization in the Au-bearing solutions (Huston and Large, 1989;Williams et al, 2009). Therefore, these processes resulted in the destabilization of the aqueous Au 1+ -sulfur carrier complexes and the formation of medium-fineness and subrounded Au grains (Figs.…”
Section: Discussionmentioning
confidence: 99%
“…This mineral paragenesis (siderite ± galena within the gossan, and cinnabar + Ag-sulfosalts within fault breccias in the cementation zone) involves a reducing solution and (bio)sulfur reduction, which constrains the role of thiosulfate complexes as the only mobilization mechanism throughout the supergene profile. In zones where solutions were more reducing, thiosulfate complexes could have been reduced to bisulfide complexes due to their high solubility under low oxygen fugacity and near neutral conditions, as well as in equilibrium with pyrite (Stroffegen, 1986;Webster, 1986;Huston and Large, 1989;Renders and Seward, 1989;Vlassopoulos and Wood 1990;Benedetti and Boulegue, 1991;Gray et al, 1992;Tagirov et al, 2006). Furthermore, late-vertical fault systems acted as high permeability conduits driving the Au-Ag-enriched basinal fluids, with precious metals thiosulfate and/or bisulfide complexes as stable compounds in solution, until reaching the cementation zone (Fig.…”
Section: Discussionmentioning
confidence: 99%
“…Gold values show positive correlations with Cu, Zn, Ag and Pb and all together classify Cerro de Maimón as a nonauriferous/base-metal VMS deposit (Poulsen and Hannington, 1995). As summarized by Hannington and Scott (1989), Huston and Large (1989) and Huston et al (1992), in modern massive sulfide-forming systems, Au is commonly transported as Au(HS) 2 − complexes, Au solubility and transport being favored at low temperatures (<300 ºC) and near neutral pH; gold subsequently precipitates upon mixing with seawater by oxidation (above the HSO 4 − -H 2 S equal activity curve), a drop in temperature (<150 ºC) and dilution of H 2 S. The starting composition of the hydrothermal fluid can further complicate the system. Enrichment in Au (not related to high-sulfidation-VMS systems, Hannington et al, 1999b) may also reflect processes such as seafloor boiling or contribution from a magmatic source deeper in the system.…”
Section: Gold: On Its Original Distribution and Later Metamorphic Remmentioning
confidence: 99%