Other
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70..687r&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 70, Issue 3, p. 687-696.
Other
10
Scientific paper
The solubility of molybdenum trioxide in liquid undersaturated water vapour has been investigated experimentally at 300, 320, and 360 °C and 39 154 bars. Results of these experiments show that the solubility of MoO3 in water vapour is between 1 and 29 ppm, which is 19 20 orders of magnitude higher than the vapour pressure of MoO3(g). Molybdenum solubility increases exponentially with f, suggesting the formation of a gaseous hydrated complex of the type MoO3·nH2O by the reaction: MoO3(g)+nH2O⇔MoO3·nH2O(g) The hydration number, n, is interpreted to have a value of 2.0 ± 1.0 at 300 °C, 2.4 ± 0.6 at 320 °C, and 3.1 ± 0.3 at 360 °C. Values of log K for this reaction are 18 ± 5 at 300 °C, 16 ± 3 at 320 °C, and 12 ± 1 at 360 °C. Comparison with data from the literature shows that the solubility of MoO3·nH2O increases non-linearly with increasing f, and that the hydration number is equal to the slope of the tangent to a function inferred from a plot of logf versus logf.The predominant species in water vapour at f≈1 bar is MoO3·H2O, whereas at the conditions of the present experiments it is MoO3·2 3H2O. Calculations based on the solubility of MoO3 in equilibrium with molybdenite at 600 °C and 500 bars, using average H2O and total S fluxes of actively degassing volcanoes, with f and f controlled by the assemblage hematite magnetite pyrite, indicate that the vapour phase can transport sufficient Mo in about 115,000 years (within the life of geothermal systems) to form a deposit of 336 Mt, with an average grade of 0.087% Mo (e.g., the Endako Mo-porphyry deposit, Canada). This suggests that vapour-phase transport of Mo is far more important than previously thought and should be given further consideration in modelling the formation of porphyry molybdenum deposits.
Migdisov Art A.
Rempel Kirsten U.
Williams-Jones Anthony E.
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