Journal
ORGANIC GEOCHEMISTRY
Volume 32, Issue 8, Pages 1019-1023Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0146-6380(01)00075-4
Keywords
n-tricosane; n-tricosene; PMI; anaerobic oxidation of methane; cold seeps
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C-13-depleted E and Z n-tricos-10-enes are prominent biomarkers in an anaerobic microbial mat at Black Sea methane seeps. These n-alkenes co-occur with archaeal irregular C-25 isoprenoid hydrocarbons, namely 2,6,10,15,19-pentamethylicosanc (PMI) and -enes (PMI Delta). Low delta C-13-values (-73 and -77 parts per thousand) for n-tricosenes and PMI imply the anabolism of methane carbon by their source biota. The n-tricosenes apparently originate from microorganisms closely associated with, if not identical to isoprenoid-producing, methane-metabolizing Archaea. Methane-seep deposits of Tertiary to Jurassic ages showed the absence of n-tricosenes, but C-13-depleted n-tricosane (delta C-13 as low as -87 parts per thousand), a plausible diagenetic product, was observed in enhanced concentrations in 7 out of 9 samples studied. It is proposed that a preference of n-tricosane over the enveloping n-alkanes may provide a specific hydrocarbon fingerprint for the anaerobic cycling of methane in ancient settings. (C) 2001 Published by Elsevier Science Ltd.
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