Experimental determination of carbon isotope fractionation between CaCO3 and graphite

2009 ◽  
Vol 73 (24) ◽  
pp. 7256-7274 ◽  
Author(s):  
Peter Deines ◽  
David H. Eggler
Keyword(s):  
Experimental Determination ◽  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Carbon Isotope Fractionation

scholarly journals Carbon Isotope Fractionation during the Formation of CO2 Hydrate and Equilibrium Pressures of 12CO2 and 13CO2 Hydrates

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4215
Author(s):  
Hiromi Kimura ◽  
Go Fuseya ◽  
Satoshi Takeya ◽  
Akihiro Hachikubo
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Small Difference ◽  
Hydrate Formation ◽  
Formation Temperature ◽  
Carbon Isotope Fractionation ◽  
Unit Cell Size ◽  
Naturally Occurring ◽  
Three Phase ◽  
The Difference

Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO2 hydrates. We investigated carbon isotope fractionation during CO2 hydrate formation and measured the three-phase equilibria of 12CO2–H2O and 13CO2–H2O systems. From a crystal structure viewpoint, the difference in the Raman spectra of hydrate-bound 12CO2 and 13CO2 was revealed, although their unit cell size was similar. The δ13C of hydrate-bound CO2 was lower than that of the residual CO2 (1.0–1.5‰) in a formation temperature ranging between 226 K and 278 K. The results show that the small difference between equilibrium pressures of ~0.01 MPa in 12CO2 and 13CO2 hydrates causes carbon isotope fractionation of ~1‰. However, the difference between equilibrium pressures in the 12CO2–H2O and 13CO2–H2O systems was smaller than the standard uncertainties of measurement; more accurate pressure measurement is required for quantitative discussion.

Large-scale carbon isotope fractionation in evaporites and the generation of extremely 13C-enriched methane

Geology ◽  
2004 ◽  
Vol 32 (6) ◽  
pp. 533 ◽  
Author(s):  
Joanna Potter ◽  
Michael G. Siemann ◽  
Mikhail Tsypukov
Keyword(s):  
Carbon Isotope ◽  
Large Scale ◽  
Isotope Fractionation ◽  
Carbon Isotope Fractionation

Carbon Isotope Fractionation in Noelaerhabdaceae Algae in Culture and a Critical Evaluation of the Alkenone Paleobarometer

2021 ◽  
Author(s):  
Samuel R. Phelps ◽  
Gwenn M. M. Hennon ◽  
Sonya T. Dyhrman ◽  
María D. Hernández‐Limón ◽  
Olivia M. Williamson ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Critical Evaluation ◽  
Carbon Isotope Fractionation
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