Carbon isotopic composition of solid carbon and C-H-O fluid produced through the decomposition of stearic acid under HP-HT condition

We estimated δ 13 C of the C-H-O fluid produced by the decomposition of stearic acid at high-pressure and high-temperature conditions (10 and 17 GPa, 800-1600°C) from δ 13 C of the solid carbon products and the initial stearic acid. The δ 13 C of the stearic acid and the recovered graphite/diamond w...

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Bibliographic Details
Published in:High pressure research 2024-01, Vol.44 (1), p.38-52
Main Authors: Kawamura, Hideaki, Ohfuji, Hiroaki, Satish-Kumar, Madhusoodhan, Kiran, Sasidharan, Suzuki, Akio
Format: Article
Language:English
Subjects:
C-H-O fluid
carbon isotope
Carbon isotopes
Decomposition reactions
diamond
Diamonds
Fractionation
High temperature
high-pressure and high-temperature experiments
isotope fractionation
Stearic acid
Stoichiometry
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Summary:We estimated δ 13 C of the C-H-O fluid produced by the decomposition of stearic acid at high-pressure and high-temperature conditions (10 and 17 GPa, 800-1600°C) from δ 13 C of the solid carbon products and the initial stearic acid. The δ 13 C of the stearic acid and the recovered graphite/diamond were −28.0‰ and −27.08 to −29.35‰, respectively. Then, the δ 13 C of the coexisting C-H-O fluid was estimated to be −26.3 to −29.2‰ based on the stoichiometry of the decomposition reaction C 18 H 36 O 2 → 10C + 8CH 4  + 2H 2 O. In the studied P-T-t conditions, carbon isotope fractionation through the stearic acid decomposition is as small as 
ISSN:0895-7959
1477-2299
DOI:10.1080/08957959.2023.2297680