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《GEOCHIMICA》 2000-01
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Evolution characteristics of δ~(13)C values of gaseous hydrocarbons under high-temperature and high-pressure conditions as suggested by aqueous pyrolysis

JIANG Feng; DU Jian-guo; XIE Hong-sen; WANG Wan-chun (Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China; Seismological Analysis and Prediction Centre, State Seismogic Bureau, Beijing 100036, China; Cuiyang Institute of Ge  
Immature organic matter (peat and lignite) were pyrolysized at temperatures ranging from 200 to 400℃ under high pressure ranging from 0.1 to 2 GPa in a closed system, and δ13℃ values of gaseous hydrocarbon generated from organic matter were measured by GC-C-MS system. At 400℃, for the peat samples, the δ13C values of ethane, propane and butane trend to become heavy with pressure increasing. Furthermore, the distribution of δ13C value for each sample has a partially reverse order characteristics, that is, δ13C2 δ13C3. For lignite samples, there is the same characteristics at 400℃ under pressure of 1. 5 GPa: δC2 δ13C3 δ13C4. At 600℃,δ13C (PDB) values of methane in peat and lignite samples are heavy, and are - 15. 4‰ and - 16. 3‰,respectively; δ13C values of ethane are -20. 0‰ and - 21. 4‰, respectively, and the distribution of δ13C value also has a partially reverse order characteristics of δ13C1 δ13C2. At 800℃ and under 2 GPa, methane has been detected in peat sample, it can be induced that high pressure makes methane more thermodynamically stable at high temperature, and δ13C value of methane in this sample is - 26. 9‰. The results indicate that pressure is one of the important factors that influence the distribution of δ13C values, it maybe causes carbon isotope fractionation, whichresults to reverse distribution of δ13C values during the evolution of organic matter.
【Fund】: 中国科学院院长基金
【CateGory Index】: P599
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