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Evidence for Microbial Carbon and Sulfur Cycling in Deeply Buried Ridge Flank Basalt
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Evidence for Microbial Carbon and Sulfur Cycling in Deeply Buried Ridge Flank Basalt
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Journal Article
Evidence for Microbial Carbon and Sulfur Cycling in Deeply Buried Ridge Flank Basalt
2013
Overview
Sediment-covered basalt on the flanks of mid-ocean ridges constitutes most of Earth's oceanic crust, but the composition and metabolic function of its microbial ecosystem are largely unknown. By drilling into 3.5-million-year-old subseafloor basalt, we demonstrated the presence of methane- and sulfur-cycling microbes on the eastern flank of the Juan de Fuca Ridge. Depth horizons with functional genes indicative of methane-cycling and sulfate-reducing microorganisms are enriched in solid-phase sulfur and total organic carbon, host δ 13 C- and δ 34 S-isotopic values with a biological imprint, and show clear signs of microbial activity when incubated in the laboratory. Downcore changes in carbon and sulfur cycling show discrete geochemical intervals with chemoautotrophic δ 13 C signatures locally attenuated by heterotrophic metabolism.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS)
Subject
