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Abstract
Chapter from: M
66: Hydrocarbon Migration And Its Near-Surface Expression
Edited By
Dietmar Schumacher and Michael A. AbramsAuthor:
A. M. Zyakun Geochemistry, Generation, Migration
Published 1996 as
part of Memoir 66
Copyright © 1996 The American Association of Petroleum
Geologists. All Rights Reserved.
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Zyakun,
A. M., 1996, Potential of 13C/12C variations in bacterial
methane in assessing origin of environmental methane, in D. Schumacher
and M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression:
AAPG Memoir 66, p. 341-352. |
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Chapter
25
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Potential
of 13C/12C Variations in Bacterial Methane in Assessing
Origin of Environmental Methane |
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| A. M. Zyakun
Institute of Biochemistry
and Physiology of Microorganisms
Russian Academy of Sciences
Pushchino, Russia
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Abstract
Laboratory experimental
results measuring carbon isotope fractionation of the methane produced
by pure cultures of methanogenic bacteria during their growth on both C1-
(CO2, formate, methanol, and methylamine) and C2-
(acetate) substrates have been carried out. Isotopic effects associated
with bacterial methane generation depend on the specific methane production
rate, that is, the amount of methane produced by a cell or cell biomass
per unit time. In some cases, the isotopic effects also depend on the specific
concentration of the substrate, or the amount of bicarbonate per unit of
cell biomass or per one bacterial cell.
Biogenic methane has various
carbon isotopic compositions both at extremely low (d13C
< -55 ) and comparatively
high (d13C
> 0) carbon isotope ratios
relative to the substrate used. Theoretical calculations show that the
carbon isotope content of bacterial methane can be depleted in 13C
by -100 relative to the
carbon dioxide in the culture medium. |
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