Equilibrium garnet-calcite oxygen isotope fractionation
| Autor: | Jeffrey M. Rosenbaum, David P. Mattey |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Calcite
Partition function (statistical mechanics) Grossular biology Chemistry Analytical chemistry Fractionation biology.organism_classification Isotopes of oxygen Equilibrium fractionation chemistry.chemical_compound Geochemistry and Petrology Andradite visual_art visual_art.visual_art_medium Temperature coefficient |
| Zdroj: | Geochimica et Cosmochimica Acta. 59:2839-2842 |
| ISSN: | 0016-7037 |
| DOI: | 10.1016/0016-7037(95)00181-x |
| Popis: | The equilibrium oxygen isotope fractionation between grossular/andradite garnet and calcite has been determined experimentally by direct exchange from 800–1200°C at ∼23 kbar. A least-squares fit to the equilibrium fractionation data reflected through the origin has the functional form 1000 l n α g r − c t T ( K ) = ( − 2.77 ± 0.19 ) × 10 6 T 2 + ( 0.0 ± 0.13 ) for temperatures greater than 800°C (±2σ errors). This is in good agreement with the difference between the reduced partition function ratios of the two phases recalculated for the purpose of comparison. The temperature coefficient from the experimental data curve has been combined with those of previous mineral-calcite exchange experiments to produce an internally consistent set of garnet-mineral oxygen isotope geothermometers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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