The Subseafloor Biosphere at Mid-Ocean Ridges
Vol. 144, 2004
GEOPHYSICAL MONOGRAPH SERIES, VOL. 144, 399 PP., 2004
ISSN: 0065-8448; ISBN: 0-87590-409-2
The Subseafloor Biosphere at Mid-Ocean Ridges
Awareness has grown over the past several years that the subseafloor may harbor a substantial biosphere sustained by volcanic
heat and chemical fluxes from the Earth's interior. This realization has profound scientific implications for questions concerning
the origins of life, the true extent of Earth's biosphere, and the search for life on other planets. At mid-ocean spreading
centers, the fluxes that sustain life are the highest, and the hydrothermal fluids in which micro-organisms grow are readily
accessible on the seafloor. In addition, periodic volcanic eruptions flush fluids and microbes from the subsurface, and volcanic
gases are believed to drive spectacular microbial blooms. Although ridges are challenging locations in which to work, they
are unique in the oceans because of the diversity and dynamic nature of their subsurface environments.
Citation: Wilcock, W. S.,
Preface
pp. vii-vii
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The subsurface biosphere at Mid-Ocean Ridges: Issues and challenges
pp. 1-11
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The upper temperature limit for life based on hyperthermophile culture experiments and field observations
pp. 13-24
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The stability of biomolecules and the implications for life at high temperatures
pp. 25-39
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On the edge of a deep biosphere: Real animals in extreme environments
pp. 41-49
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Geophysical constraints on the subseafloor environment near mid-ocean ridges
pp. 51-74
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Diking, event plumes, and the subsurface biosphere at mid-ocean ridges
pp. 75-97
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Fluid flow and fluid-rock interaction within ocean crust: Reconciling geochemical, geological, and geophysical observations
pp. 99-117
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Serpentinization of oceanic peridotites: Implications for geochemical cycles and biological activity
pp. 119-136
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Environmental conditions within active seafloor vent structures: Sensitivity to vent fluid composition and fluid flow
pp. 137-152
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Geochemical energy sources that support the subsurface biosphere
pp. 153-165
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Volatiles in submarine environments: Food for life
pp. 167-189
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Activation of diatomic and triatomic molecules for the synthesis of organic compounds: Metal catalysis at the subseafloor biosphere
pp. 191-198
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Potential importance of dissimilatory Fe(III)-reducing microorganisms in hot sedimentary environments
pp. 199-211
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Significance of polysaccharides in microbial physiology and the ecology of hydrothermal vent environments
pp. 213-226
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Detection of and response to mid-ocean ridge magmatic events: Implications for the subsurface biosphere
pp. 227-243
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Diffuse flow hydrothermal fluids from 9° 50′ N East Pacific Rise: Origin, evolution and biogeochemical controls
pp. 245-268
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Mixing, reaction and microbial activity in the sub-seafloor revealed by temporal and spatial variation in diffuse flow vents at axial volcano
pp. 269-289
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Illuminating subseafloor ecosystems using microbial tracers
pp. 291-303
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Sedimented ridges as a laboratory for exploring the subsurface biosphere
pp. 305-323
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The oceanic crust as a bioreactor
pp. 325-341
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Diversity of life at the geothermal subsurface—surface interface: The Yellowstone example
pp. 343-354
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Unifying principles of the deep terrestrial and deep marine biospheres
pp. 355-367
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Distribution of unusual archaea in subsurface biosphere
pp. 369-381
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Studying the deep subsurface biosphere: Emerging technologies and applications
pp. 383-399
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