Mathematics – Logic
Scientific paper
Nov 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15..131e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 1-2, pp.131-149
Mathematics
Logic
2
Scientific paper
All available chemical and thermodynamic information is utilized to construct a diagram showing the stability relationships of the known vanadium compounds in aqueous equilibrium in terms of oxidation potential and pH. The disparity between the observed precipitation conditions and those calculated from the published free energies of the oxides is used to estimate the free energy of hydration of the hydrated forms found in nature. The well-established vanadium mineral species (not including silicates) are assigned regions of stability on the equilibrium diagram on the basis of chemical constitution, crystal structure and observed petrologic associations. It is found that a completely self-consistent alteration sequence appears on the mineral diagram, showing the changes that occur in the vanadium ores under weathering conditions. Montroseite, VO(OH), is evidently the primary mineral source of vanadium. Two distinct branches appear in the alteration sequence: one is confined to acid conditions characteristic of zones of primary vanadium oxide concentration in the sandstone in the presence of pyrite; and the other occurs in more basic conditions where calcite is common. The equilibrium diagram is used to draw tentative conclusions regarding the conditions under which the original montroseite was deposited in the sandstones, presumably through the action of mineralizing solutions.
Evans Howard T. Jr.
Garrels Robert M.
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