Deep subsurface / groundwater geomicrobiology

Sulfate-reducing bacteria (SRB) in the deep subsurface: oceanic crust is the planet’s largest aquifer, through which seawater circulates through deeply-buried sediments. We profiled the diversity of an ultra-deep (400+ mbsf) community of SRB in a NE Pacific subduction zone, to explore the limits to subsurface habitability.

Microbial responses to deep supercritical CO2 injection: geosequestration of scCO2 into deep aquifers (~1.4 km below surface) has been experimentally trialled as a mitigation technology for atmospheric CO2 build-up. We evaluated the effect of scCO2 on the subsurface microbiome, and isolated the genome of a dominant microbial community member.

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