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• W1975589020 endingPage "241" @default.
• W1975589020 startingPage "233" @default.
• W1975589020 abstract "Linear saturated dicarboxylic acids are present in carbonaceous chondrite samples at concentrations that suggest aqueous alteration under conditions of metastable equilibrium. In this study, previously published values of dicarboxylic acid concentrations measured in Murchison, Yamato-791198, and Tagish Lake carbonaceous chondrites are converted to aqueous activities during aqueous alteration assuming water:rock ratios that range from 1:10 to 10:1. Logarithmic plots of the aqueous activities of any two dicarboxylic acids are proximal to lines whose slope is fixed by the stoichiometry of reactions describing the oxidation–reduction equilibrium between the two species. The precise position of any line is controlled by the equilibrium constant of the reaction relating the species and the hydrogen fugacity for the reaction of interest. Reactions among succinic (C4), glutaric (C5), and adipic (C6) acids obtained from CM2 chondrites show evidence of metastable equilibrium and yield logfH2 values that agree to within 0.3 log units at 298.15 K and 0.6 log units at 473.15 K. At a water:rock ratio of 1:1, metastable equilibrium among succinic, glutaric, and adipic acids results in calculated logfH2 values during aqueous alteration that range from −6.2 at 298.15 K to −3.3 at 373.15 K. These values are consistent with those obtained in previous work on carbonaceous chondrites and with metastable equilibrium at temperatures ranging from 300 to 355 K in contact with cronstedtite + magnetite." @default.
• W1975589020 created "2016-06-24" @default.
• W1975589020 creator A5007069469 @default.
• W1975589020 creator A5015083873 @default.
• W1975589020 date "2008-01-01" @default.
• W1975589020 modified "2023-10-01" @default.
• W1975589020 title "Metastable equilibria among dicarboxylic acids and the oxidation state during aqueous alteration on the CM2 chondrite parent body" @default.
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• W1975589020 doi "https://doi.org/10.1016/j.gca.2007.10.008" @default.
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