Meteoric water-basalt interactions. I. A laboratory study

作者: Sigurdur R. Gislason , P.Eugster Hans

DOI: 10.1016/0016-7037(87)90161-X

关键词: MineralogyClay mineralsAnalytical chemistryCarbFixHydrogenActivation energyChemical reactionDissolutionBasaltChemistryStoichiometry

摘要: Rates, stoichiometry and activation energy of dissolution, pH vs. time activity-activity paths were determined by dissolving basaltic rocks under simulated natural conditions at 25 to 60°C. Dissolution follows a linear rate law, with glass about 10 times faster than crystalline basalt. Rates are independent from 7 9.5. The dissolves near stoichiometrically 25°C, but this is not so for the average dissolution 32 kJ/ mol (±3). For individual elements leached basalt, it ranges 35 15 kj/mol. This indicates that experimental reactions on surfaces solids rate-determining step in mechanism. Ca, Mg, Si reached steady state or equilibrium concentrations solutions 45 65°C. Alteration minerals formed vugs did form continuous protective layer solids. Reaction strongly dependent their versus evolution. Solutions sealed off atmosphere evolve into Ca-zeolite field, whereas those open clay mineral fields. During experiments consumption hydrogen 25°C (10−5 mol/kg) sufficient significantly change isotope ratio solutions.

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