Characterization of sorbed volatile hydrocarbons from the Peru margin, supplement to: Whiticar, Michael J; Suess, Erwin (1990): Characterization of sorbed volatile hydrocarbons from the Peru margin, Leg 112, Sites 679, 680/681, 682, 684, and 686/687. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 527-538

Michael J Whiticar & Erwin Suess
Bacterial and thermogenic hydrocarbons are present in the sorbed-gas fraction of Peru margin sediments. At Ocean Drilling Program (ODP) Sites 681, 682, 684, and 686, bacterial gases are restricted to the early diagenetic zones, where dissolved sulfate has been exhausted and methanogenesis occurs. Methane migrating into the sulfate zone at Sites 681, 684, 686, and possibly 682, has been consumed anaerobically by methanotrophs, maintaining the low concentrations and causing an isotope shift in d13C(CH4) to...
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