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Related Experiment Videos

Sulfate reduction in deep-sea sediments.

D E Canfield1

  • 1NASA-Ames Research Center, Moffett Field, California 94035-1000, USA.

American Journal of Science
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

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Sulfate reduction rates are highest near continental margins and decrease towards ocean basins. Sediment deposition rate significantly influences organic carbon availability for sulfate reduction.

Area of Science:

  • Geochemistry
  • Oceanography
  • Marine Geology

Background:

  • Sulfate reduction is a key microbial process in marine sediments.
  • Understanding its spatial distribution is crucial for biogeochemical cycling.
  • Previous studies have linked sulfate reduction to organic matter availability.

Purpose of the Study:

  • To map and analyze global sulfate reduction rates.
  • To investigate the relationship between sulfate reduction and primary organic production.
  • To identify key factors controlling sulfate reduction in marine sediments.

Main Methods:

  • Analysis of approximately 200 Deep Sea Drilling Project (DSDP) pore water sulfate profiles.
  • Contouring and spatial plotting of calculated sulfate reduction rates.
Keywords:
NASA Center ARCNASA Discipline ExobiologyNASA Discipline Number 52-30NASA Program Exobiology

Related Experiment Videos

  • Statistical comparison of sulfate reduction rates with primary production, water depth, and sediment deposition rates.

    • Main Results:

    • Sulfate reduction rates exhibit spatial consistency, highest near continental margins and decreasing towards ocean basins.
    • Elevated rates were observed in the eastern equatorial Pacific, correlating with upwelling and high primary production.
    • While overall distribution mirrors primary production, direct correlation is only moderately strong.
    • Sediment deposition rate emerges as a critical factor, controlling organic carbon flux to sulfate reduction zones.

    Conclusions:

    • Sediment deposition rate is a primary control on sulfate reduction by influencing organic carbon availability.
    • Accurate prediction of sulfate reduction rates requires integrating primary production, water depth, and sediment deposition rate.
    • The spatial patterns of sulfate reduction are influenced by both surface productivity and sedimentary processes.