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Geophysical Monograph Series



  • Deep-sea ecology—Congresses
  • Mid-ocean ridges—Congresses



Geochemical energy sources that support the subsurface biosphere

Everett L. Shock

Department of Geological Sciences and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona

Melanie E. Holland

Department of Geological Sciences, Arizona State University, Tempe, Arizona

Predictions of bioavailable energy can be made through calculation of geochemical disequilibria. The geochemical model of McCollom and Shock [1997] of mid-ocean ridge black smoker systems was tested against microbiological measurements collected in these environments. This model was modified in this paper to include hydrogen oxidation, as there was evidence that hydrogen—oxidizing microorganisms inhabit black smoker environments. The sharp distinction between high temperature, anoxic environments and low temperature, oxic environments in the model of McCollom and Shock [1997] disappeared in the new model; both reductive and oxidative metabolic strategies provided energy in low- and high-temperature environments. Future directions for model modification are explored, in light of potential subseafloor biotopes.

Citation: Shock, E. L., and M. E. Holland (2004), Geochemical energy sources that support the subsurface biosphere, in The Subseafloor Biosphere at Mid-Ocean Ridges, Geophys. Monogr. Ser., vol. 144, edited by W. S. Wilcock et al., pp. 153–165, AGU, Washington, D. C., doi:10.1029/144GM10.


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