Rates of Hydrothermal Reactions

See allHide authors and affiliations

Science  28 Oct 1983:
Vol. 222, Issue 4622, pp. 413-415
DOI: 10.1126/science.222.4622.413


The rates of reactions of silicates and aqueous fluids follow zero-order kinetics controlled by the reacting surface area with the rate constant given by the equation: log k[unknown] -2900/T -6.85, where T is temperature and where k has the unit's gram-atoms of oxygen per square centimeter per second. This expression appears to hold for all silicates and for reactions involving dissolution, fluid production, or solid-solid transformations in the presence of a fluid of moderate to high pH.