A Contemporary Microbially Maintained Subglacial Ferrous "Ocean"

@article{Mikucki2009ACM,
  title={A Contemporary Microbially Maintained Subglacial Ferrous "Ocean"},
  author={Jill A. Mikucki and Ann Pearson and David T. Johnston and Alexandra V. Turchyn and J. Farquhar and Daniel P. Schrag and Ariel D. Anbar and John C. Priscu and Peter A. Lee},
  journal={Science},
  year={2009},
  volume={324},
  pages={397 - 400}
}
An active microbial assemblage cycles sulfur in a sulfate-rich, ancient marine brine beneath Taylor Glacier, an outlet glacier of the East Antarctic Ice Sheet, with Fe(III) serving as the terminal electron acceptor. Isotopic measurements of sulfate, water, carbonate, and ferrous iron and functional gene analyses of adenosine 5′-phosphosulfate reductase imply that a microbial consortium facilitates a catalytic sulfur cycle. These metabolic pathways result from a limited organic carbon supply… Expand
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References

SHOWING 1-10 OF 57 REFERENCES
Ferruginous Conditions Dominated Later Neoproterozoic Deep-Water Chemistry
TLDR
It is reported that through much of the later Neoproterozoic, anoxia remained widespread beneath the mixed layer of the oceans; deeper water masses were sometimes sulfidic but were mainly Fe2+-enriched, marking a return to ocean chemistry not seen for more than one billion years of Earth history. Expand
A new model for Proterozoic ocean chemistry
There was a significant oxidation of the Earth's surface around 2 billion years ago (2 Gyr). Direct evidence for this oxidation comes, mostly, from geological records of the redox-sensitive elementsExpand
Geomicrobiology of subglacial ice above Lake Vostok, Antarctica.
TLDR
Bacterial 16S ribosomal DNA genes revealed low diversity in the gene population, and phylotypes were closely related to extant members of the alpha- and beta-Proteobacteria and the Actinomycetes. Expand
Oxygen isotopic composition of sulfate in deep sea pore fluid: Evidence for rapid sulfur cycling
Changes in the major element and related isotope profiles in porewaters of organic-rich sediments suggest that various microbial processes using a succession of electron acceptors are in play duringExpand
Oxygen Isotope Constraints on the Sulfur Cycle over the Past 10 Million Years
TLDR
A numerical model suggests that sea level fluctuations during Plio-Pleistocene glacial cycles affected the sulfur cycle by reducing the area of continental shelves and increasing the oxidative weathering of pyrite. Expand
Microbially Driven Redox Reactions in Anoxic Environments: Pathways, Energetics, and Biochemical Consequences
After consumption of molecular oxygen, anaerobic microbial communities can use a continuum of alternative electron acceptors such as nitrate, manganese oxides, iron oxides, sulfate or CO2, withExpand
Halogen geochemistry of the McMurdo dry valleys lakes, Antarctica: Clues to the origin of solutes and lake evolution
Abstract We have determined the halogen and boron concentrations in the ice-covered lakes of Taylor Valley, Antarctica, to better establish the sources of salts and evolutionary histories of theseExpand
Bacterial Diversity Associated with Blood Falls, a Subglacial Outflow from the Taylor Glacier, Antarctica
TLDR
The results, together with previous reports, suggest that the brine below the Taylor Glacier hosts a viable ecosystem with microorganisms capable of growth, supported by chemical energy present in reduced iron and sulfur compounds. Expand
Pleistocene ice and paleo-strain rates at Taylor Glacier, Antarctica
Abstract Ice exposed in ablation zones of ice sheets can be a valuable source of samples for paleoclimate studies and information about long-term ice dynamics. We report a 28-km long stable isotopeExpand
Mass-Independent Sulfur of Inclusions in Diamond and Sulfur Recycling on Early Earth
Populations of sulfide inclusions in diamonds from the Orapa kimberlite pipe in the Kaapvaal-Zimbabwe craton, Botswana, preserve mass-independent sulfur isotope fractionations. The data indicate thatExpand
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