How deep do bacteria travel within the Earth's crust?

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SUMMARY

Bacteria can potentially travel deep within the Earth's crust, with evidence suggesting they may be found as deep as 10 kilometers. Sulfur-based bacteria are capable of surviving at temperatures around 250°F for extended periods, possibly thriving in subduction zones. However, the availability of hydrogen sulfide, a critical energy source for these organisms, remains uncertain in such environments. The discussion raises questions about the metabolic activity of these bacteria in extreme conditions, suggesting they may exist in a state of suspended animation rather than active growth.

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  • Understanding of extremophiles and their survival mechanisms
  • Knowledge of subduction zone geology
  • Familiarity with sulfur-based metabolic processes
  • Basic concepts of deep-ocean rift ecosystems
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  • Research the survival strategies of extremophiles in high-temperature environments
  • Explore the role of hydrogen sulfide in deep-sea ecosystems
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  • Study the metabolic pathways of sulfur-based bacteria
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Loren Booda
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How far might bacteria have been subducted within the Earth's crust? I suppose water could have carried single celled organisms to the current record, ~10 km down. Here I'm offering that sulfur-based bacteria could live at temperatures near 250o F, for possibly thousands of years, traveling many more miles beneath Earth's surface than now known.
 
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Interesting idea, to which I would ask - if they require hydrogen sulfide as their energy source, such as that found at deep-ocean rift ecosystems, would that still be available (under the conditions required to support life) in these subduction zones? I would think at least water, a critical component, would be in short supply. This doesn't mean that the bacteria couldn't survive under the conditions present in subduction zones, but are they actually metabolically active and thriving or are they simply in a type of suspended animation?
 

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