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Fluids from the Oceanic Crust Support Microbial Activities within the Deep Biosphere

机译:Fluids from the Oceanic Crust Support Microbial Activities within the Deep Biosphere

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摘要

The importance of crustal fluid chemical composition in driving the marine deep subseafloor biosphere was examined in northeastPacific ridge-flank sediments. At IODP Site U1301, sulfate fromcrustal fluids diffuses into overlying sediments, forming a transitionzone where sulfate meets in situ-produced methane. Enhancedcell counts and metabolic activity suggest that sulfate stimulates microbialrespiration, specifically anaerobic methane oxidation coupledto sulfate reduction. Cell counts and activity are also elevatedin basement-near layers. Owing to the worldwide expansion of thecrustal aquifer, we postulate that crustal fluids may fuel the marinedeep subseafloor biosphere on a global scale.

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