Partitioning of 13 C and 12 C on the degassing of CO 2 and the precipitation of calcite; Rayleigh-type fractionation and a kinetic model

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ID: 294047
1985
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Abstract
Calcite is not precipitated immediately from a supersaturated Ca-bicarbonate solution that becomes supersaturated by degassing CO/sub 2/. The degree of supersaturation increases until calcite begins to precipitate at ..delta..G approx. -1 kcal/mole. Over the whole range of the initial CO/sub 2/-degassing and the subsequent precipitation, the carbon isotope composition of the dissolved carbonate changes systematically. Measurements at the calcite-precipitating spring of Gueterstein, Germany indicate that this variation is controlled kinetically and cannot be attributed to a Rayleigh-type fractionation. An analytical expression for a kinetic model is derived. From this expression the ratio of rate constants for /sup 13/C- and /sup 12/C-species, controlling the partitioning, can be obtained.
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Authors J. Michaelis, E. Usdowski, G. Menschel
Journal american journal of science
Year 1985
DOI
10.2475/ajs.285.4.318
URL
https://ajs.scholasticahq.com/article/60343.pdf
Keywords Keywords not found

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