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Apr
2017

Reactive Fe(III) minerals can influence methane (CH4 ) emissions by inhibiting microbial methanogenesis or by stimulating anaerobic CH4 oxidation. The balance between Fe(III) reduction, methanogenesis, and CH4 oxidation in ferruginous Archean and Paleoproterozoic oceans would have controlled CH4 fluxes to the atmosphere, thereby regulating the capacity for CH4 to warm the early Earth under the Faint Young Sun. We studied CH4 and Fe cycling in anoxic incubations of ferruginous sediment from the ancient ocean analogue Lake Matano, Indonesia, over three successive transfers (500 days in total).
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http://biorxiv.org/content/biorxiv/early/2016/11/15/087783.f
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http://biorxiv.org/content/biorxiv/early/2017/02/13/087783.f
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http://doi.wiley.com/10.1111/gbi.12239
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In Lake Matano, Indonesia, the world's largest known ferruginous basin, more than 50% of authigenic organic matter is degraded through methanogenesis, despite high abundances of Fe (hydr)oxides in the lake sediments. Biogenic CH₄ accumulates to high concentrations (up to 1.4 mmol L⁻¹) in the anoxic bottom waters, which contain a total of 7.

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Dec
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Sep
2015

Modeling the carbon cycle in Lake Matano.

Geobiology 2015 Sep 29;13(5):454-61. Epub 2015 Apr 29.
L B Kuntz, T A Laakso, D P Schrag, S A Crowe
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Jul
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