Mogollón, J. M., Dale, Andy W. , Fossing, H. and Regnier, P. (2012) Timescales for the development of methanogenesis and free gas layers in recently-deposited sediments of Arkona Basin (Baltic Sea). Biogeosciences (BG), 9 . pp. 1915-1933.

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Abstract

Arkona Basin (southwestern Baltic Sea) is a
seasonally-hypoxic basin characterized by the presence of
free methane gas in its youngest organic-rich muddy stratum.
Through the use of reactive transport models, this
study tracks the development of the methane geochemistry
in Arkona Basin as this muddy sediment became deposited
during the last 8 kyr. Four cores are modeled each pertaining
to a unique geochemical scenario according to their respective
contemporary geochemical profiles. Ultimately the
thickness of the muddy sediment and the flux of particulate
organic carbon are crucial in determining the advent of
both methanogenesis and free methane gas, the timescales
over which methanogenesis takes over as a dominant reaction
pathway for organic matter degradation, and the timescales
required for free methane gas to form.

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