Experimental measurements of the graphite C-O equilibrium and CO2 fugacities at high temperature and pressure

Daniel J. Frost; Bernard J. Wood

doi:10.1007/BF02688245

Experimental measurements of the graphite C-O equilibrium and CO2 fugacities at high temperature and pressure

Daniel J. Frost^*, Bernard J. Wood

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

The f_{o 2} of the equilibrium between graphite and C-O fluid has been determined from 15-30 kbar and 1100-1400°C using a sliding redox sensor consisting of (Ni, Mn) O+Ni metal. The equilibrium composition of oxide coexisting with metal was approached from both directions in each experiment with convergence to within 1 mol% NiO. Since, in the P-T range of the experiments, C-O fluids are >90% CO₂ our measurements of f_{o 2} translate into determinations of CO₂ fugacity with an uncertainty of ±0.1 log units. These new determinations of the P-T-f_{o 2} plane of GCO equilibrium are in excellent agreement with the mainly unreversed measurements of Ulmer and Luth (1991) using pure metal-metal oxide sensors and with the equation of state of Saxena and Fei (1987). Modified forms of the Redlich-Kwong (MRK) equation of state (Holloway 1977; Flowers 1979; Kerrick and Jacobs 1981) predict higher values of f_{o 2} for the GCO equilibrium than determined experimentally. This implies that CO₂ is more compressible than the MRK predicts.

Original language	English
Pages (from-to)	303-308
Number of pages	6
Journal	Contributions to Mineralogy and Petrology
Volume	121
Issue number	3
DOIs	https://doi.org/10.1007/BF02688245
Publication status	Published - Sep 1995

Access to Document

10.1007/BF02688245

Link to publication in Scopus

Fingerprint Dive into the research topics of 'Experimental measurements of the graphite C-O equilibrium and CO2 fugacities at high temperature and pressure'. Together they form a unique fingerprint.

Cite this

@article{be526ac1831c4afeae021ecfac62d25b,

title = "Experimental measurements of the graphite C-O equilibrium and CO2 fugacities at high temperature and pressure",

abstract = "The f o 2 of the equilibrium between graphite and C-O fluid has been determined from 15-30 kbar and 1100-1400°C using a sliding redox sensor consisting of (Ni, Mn) O+Ni metal. The equilibrium composition of oxide coexisting with metal was approached from both directions in each experiment with convergence to within 1 mol% NiO. Since, in the P-T range of the experiments, C-O fluids are >90% CO2 our measurements of f o 2 translate into determinations of CO2 fugacity with an uncertainty of ±0.1 log units. These new determinations of the P-T-f o 2 plane of GCO equilibrium are in excellent agreement with the mainly unreversed measurements of Ulmer and Luth (1991) using pure metal-metal oxide sensors and with the equation of state of Saxena and Fei (1987). Modified forms of the Redlich-Kwong (MRK) equation of state (Holloway 1977; Flowers 1979; Kerrick and Jacobs 1981) predict higher values of f o 2 for the GCO equilibrium than determined experimentally. This implies that CO2 is more compressible than the MRK predicts.",

author = "Frost, {Daniel J.} and Wood, {Bernard J.}",

year = "1995",

month = sep,

doi = "10.1007/BF02688245",

language = "English",

volume = "121",

pages = "303--308",

journal = "Contributions to Mineralogy and Petrology",

issn = "0010-7999",

publisher = "Springer, Springer Nature",

number = "3",

}

TY - JOUR

T1 - Experimental measurements of the graphite C-O equilibrium and CO2 fugacities at high temperature and pressure

AU - Frost, Daniel J.

AU - Wood, Bernard J.

PY - 1995/9

Y1 - 1995/9

N2 - The f o 2 of the equilibrium between graphite and C-O fluid has been determined from 15-30 kbar and 1100-1400°C using a sliding redox sensor consisting of (Ni, Mn) O+Ni metal. The equilibrium composition of oxide coexisting with metal was approached from both directions in each experiment with convergence to within 1 mol% NiO. Since, in the P-T range of the experiments, C-O fluids are >90% CO2 our measurements of f o 2 translate into determinations of CO2 fugacity with an uncertainty of ±0.1 log units. These new determinations of the P-T-f o 2 plane of GCO equilibrium are in excellent agreement with the mainly unreversed measurements of Ulmer and Luth (1991) using pure metal-metal oxide sensors and with the equation of state of Saxena and Fei (1987). Modified forms of the Redlich-Kwong (MRK) equation of state (Holloway 1977; Flowers 1979; Kerrick and Jacobs 1981) predict higher values of f o 2 for the GCO equilibrium than determined experimentally. This implies that CO2 is more compressible than the MRK predicts.

AB - The f o 2 of the equilibrium between graphite and C-O fluid has been determined from 15-30 kbar and 1100-1400°C using a sliding redox sensor consisting of (Ni, Mn) O+Ni metal. The equilibrium composition of oxide coexisting with metal was approached from both directions in each experiment with convergence to within 1 mol% NiO. Since, in the P-T range of the experiments, C-O fluids are >90% CO2 our measurements of f o 2 translate into determinations of CO2 fugacity with an uncertainty of ±0.1 log units. These new determinations of the P-T-f o 2 plane of GCO equilibrium are in excellent agreement with the mainly unreversed measurements of Ulmer and Luth (1991) using pure metal-metal oxide sensors and with the equation of state of Saxena and Fei (1987). Modified forms of the Redlich-Kwong (MRK) equation of state (Holloway 1977; Flowers 1979; Kerrick and Jacobs 1981) predict higher values of f o 2 for the GCO equilibrium than determined experimentally. This implies that CO2 is more compressible than the MRK predicts.

UR - http://www.scopus.com/inward/record.url?scp=0029526420&partnerID=8YFLogxK

U2 - 10.1007/BF02688245

DO - 10.1007/BF02688245

M3 - Article

AN - SCOPUS:0029526420

VL - 121

SP - 303

EP - 308

JO - Contributions to Mineralogy and Petrology

JF - Contributions to Mineralogy and Petrology

SN - 0010-7999

IS - 3

ER -