Аннотация
Recently, methane (CH4) of possible abiogenic origin has been reported
from many Localities within Earth's crust, However, little is known
about the mechanisms of abiogenic methane formation, or about isotopic
fractionation during such processes. Here, a hydrothermally formed
nickel-iron alloy was shown to catalyze the otherwise prohibitively
slow formation of abiogenic CH4 from dissolved bicarbonate (HCO3-)
under hydrothermal conditions. Isotopic fractionation by the catalyst
resulted in delta(13)C values of the CH4 formed that are as Low as
those typically observed for microbial methane, with similarly high
CH4/(C2H6 + C3H8) ratios. These results, combined with the increasing
recognition of nickel-iron alloy occurrence in oceanic crusts, suggest
that abiogenic methane may be more widespread than previously thought.
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