Stability of methane in reduced C–O–H fluid at 6.3 GPa and 1300–1400°C
- Authors: Sokol A.G.1,2, Tomilenko A.A.1,2, Bul’bak T.A.1, Palyanova G.A.1,2, Palyanov Y.N.1,2, Sobolev N.V.1,2
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Affiliations:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Novosibirsk State University
- Issue: Vol 474, No 2 (2017)
- Pages: 680-683
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/190073
- DOI: https://doi.org/10.1134/S1028334X17060149
- ID: 190073
Cite item
Abstract
The composition of a reduced C–O–H fluid was studied by the method of chromatography–mass spectrometry under the conditions of 6.3 GPa, 1300–1400°C, and fO2 typical of the base of the subcratonic lithosphere. Fluids containing water (4.4–96.3 rel. %), methane (37.6–0.06 rel. %), and variable concentrations of ethane, propane, and butane were obtained in experiments. With increasing fO2, the proportion of the CH4/C2H6 peak areas on chromatograms first increases and then decreases, whereas the CH4/C3H8 and CH4/C4H10 ratios continually decrease. The new data show that ethane and heavier HCs may be more stable to oxidation, than previously thought. Therefore, when reduced fluids pass the “redox-front,” carbon is not completely released from the fluid and may be involved in diamond formation.
About the authors
A. G. Sokol
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Author for correspondence.
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk
A. A. Tomilenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk
T. A. Bul’bak
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk
G. A. Palyanova
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk
Yu. N. Palyanov
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk
N. V. Sobolev
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk