CARBON ISOTOPE FRACTIONATION BETWEEN CALCITE, GRAPHITE AND CO2: AN EXPERIMENTAL STUDY
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dc.contributor.author | Scheele N. | |
dc.contributor.author | Hoefs J. | |
dc.date.accessioned | 2020-11-09T07:44:48Z | |
dc.date.available | 2020-11-09T07:44:48Z | |
dc.date.issued | 1992 | |
dc.identifier | https://elibrary.ru/item.asp?id=31611842 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 1992, , 1, 35-45 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/18725 | |
dc.description.abstract | The partitioning of stable carbon isotopes between calcite, graphite and CO2 was experimentally determined at temperatures from 500 to 1200 °C and 1 to 15 kbar pressure. Attainment of carbon isotope equilibrium in CO2-calcite runs was proven by achieving the same fractionation from isotopically opposite directions. The resultant CO2-calcite fractionation curve for carbon differs from Bottinga's calculation by 1.2‰ and confirms recent experiments of Chacko et al. and Mattey et al. In CO2-graphite experiments equilibrium fractions were extrapolated by applying the partial-exchange technique of Northrop and Clayton and by optimizing the contribution of surface reaction in graphite. CO2-graphite fractionations at temperatures up to 800 °C are in fair agreement with Bottinga's calculation, but yield a surprisingly high fractionation of ≈5‰ at upper mantle temperatures. The combination of CO2-calcite (carbon) and CO2-graphite fractionation results in a new experimentally determined calcite-grapite fractionation curve, expressed by the equation: 103 ln αcc - gr=7.99×106/T2−9.58×103/+5.76 (873 - 1473 Kelvin) Applying the experimentally determined fractionation curve on graphite-bearing metacarbonates yields metamorphic temperatures distinctly higher than those obtained by Valley and O'Neil. | |
dc.title | CARBON ISOTOPE FRACTIONATION BETWEEN CALCITE, GRAPHITE AND CO2: AN EXPERIMENTAL STUDY | |
dc.type | Статья |
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