Oliver Warr
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View article: The impact of CO2-charged fluids on the aqueous geochemistry of terrestrial aquifers
The impact of CO2-charged fluids on the aqueous geochemistry of terrestrial aquifers Open
View article: Generation, migration and accumulation of natural hydrogen and helium in the intracratonic São Francisco Basin, eastern Brazil: implications for the understanding and exploration of natural H <sub>2</sub> systems
Generation, migration and accumulation of natural hydrogen and helium in the intracratonic São Francisco Basin, eastern Brazil: implications for the understanding and exploration of natural H <sub>2</sub> systems Open
An integrated understanding of H 2 generation, migration, trapping and preservation is required to facilitate H 2 exploration. Hydrogen-rich gas discoveries in the São Francisco Basin in Brazil enable investigation of these processes in in…
View article: Passive degassing of lithospheric volatiles recorded in shallow young groundwater
Passive degassing of lithospheric volatiles recorded in shallow young groundwater Open
View article: Deep terrestrial indigenous microbial community dominated by Candidatus Frackibacter
Deep terrestrial indigenous microbial community dominated by Candidatus Frackibacter Open
Characterizing deep subsurface microbial communities informs our understanding of Earth’s biogeochemistry as well as the search for life beyond the Earth. Here we characterized microbial communities within the Kidd Creek Observatory subsur…
View article: Isotopic evidence of acetate turnover in Precambrian continental fracture fluids
Isotopic evidence of acetate turnover in Precambrian continental fracture fluids Open
The deep continental crust represents a vast potential habitat for microbial life where its activity remains poorly constrained. Organic acids like acetate are common in these ecosystems, but their role in the subsurface carbon cycle - inc…
View article: Isotopic evidence of acetate turnover in the Precambrian continental crust
Isotopic evidence of acetate turnover in the Precambrian continental crust Open
The deep continental crust represents a vast potential habitat for microbial life where its activity remains poorly constrained. A common characteristic of these ecosystems is the presence of organic acids like acetate, but the role of the…
View article: Hydrogeological controls on microbial activity and habitability in the Precambrian continental crust
Hydrogeological controls on microbial activity and habitability in the Precambrian continental crust Open
Earth's deep continental subsurface is a prime setting to study the limits of life's relationship with environmental conditions and habitability. In Precambrian crystalline rocks worldwide, deep ancient groundwaters in fracture networks ar…
View article: The Hidden Hydrogeosphere: The Contribution of Deep Groundwater to the Planetary Water Cycle
The Hidden Hydrogeosphere: The Contribution of Deep Groundwater to the Planetary Water Cycle Open
The canonical water cycle assumes that all water entering the subsurface to form groundwater eventually reenters the surface water cycle by discharge to lakes, streams, and oceans. Recent discoveries in groundwater dating have challenged t…
View article: Radiolytically reworked Archean organic matter in a habitable deep ancient high-temperature brine
Radiolytically reworked Archean organic matter in a habitable deep ancient high-temperature brine Open
Investigations of abiotic and biotic contributions to dissolved organic carbon (DOC) are required to constrain microbial habitability in continental subsurface fluids. Here we investigate a large (101–283 mg C/L) DOC pool in an ancient (>1…
View article: The low permeability of the Earth’s Precambrian crust
The low permeability of the Earth’s Precambrian crust Open
View article: The application of Monte Carlo modelling to quantify in situ hydrogen and associated element production in the deep subsurface
The application of Monte Carlo modelling to quantify in situ hydrogen and associated element production in the deep subsurface Open
The subsurface production, accumulation, and cycling of hydrogen (H 2 ), and cogenetic elements such as sulfate (SO 4 2- ) and the noble gases (e.g., 4 He, 40 Ar) remains a critical area of research in the 21st century. Understanding how t…
View article: Reversibility controls on extreme methane clumped isotope signatures from anaerobic oxidation of methane
Reversibility controls on extreme methane clumped isotope signatures from anaerobic oxidation of methane Open
View article: Radiolysis-Driven Evolution of an Ancient Subsurface Habitable Brine in the Witwatersrand Basin, South Africa
Radiolysis-Driven Evolution of an Ancient Subsurface Habitable Brine in the Witwatersrand Basin, South Africa Open
View article: The impact of sedimentary basin architecture and gas phase formation on the transport of helium
The impact of sedimentary basin architecture and gas phase formation on the transport of helium Open
View article: Hydrogeological controls on microbial activity in continental crust
Hydrogeological controls on microbial activity in continental crust Open
View article: Groundwater Residence Time Compilation for Precambrian Rocks
Groundwater Residence Time Compilation for Precambrian Rocks Open
Residence times estimates from noble gases are provided for various locations in Canada, Finland, Sweden and South Africa along with porosities. Depth of samples are documented.
View article: New Insights into Groundwater Dating from Paired <sup>14</sup>C, <sup>4</sup>He, and High-precision <sup>40</sup>Ar Measurements in the Columbia River Basalt Aquifer System
New Insights into Groundwater Dating from Paired <sup>14</sup>C, <sup>4</sup>He, and High-precision <sup>40</sup>Ar Measurements in the Columbia River Basalt Aquifer System Open
View article: Novel isotopic techniques to investigate the deep subsurface acetate cycle
Novel isotopic techniques to investigate the deep subsurface acetate cycle Open
View article: The Low Permeability of the Earth’s Precambrian Crust
The Low Permeability of the Earth’s Precambrian Crust Open
The large volume of deep groundwater in the Precambrian crust has only recently been understood to be relatively hydrogeologically isolated from the rest of the hydrologic cycle. Currently, the paucity of permeability measurements in the P…
View article: Hydrogeochemical and isotopic signatures elucidate deep subsurface hypersaline brine formation through radiolysis driven water-rock interaction
Hydrogeochemical and isotopic signatures elucidate deep subsurface hypersaline brine formation through radiolysis driven water-rock interaction Open
Geochemical and isotopic fluid signatures from a 2.9–3.2 km deep, 45–55 °C temperature, hypersaline brine from Moab Khotsong gold and uranium mine in the Witwatersrand Basin of South Africa were combined with radiolytic and water–rock isot…
View article: 86Kr excess and other noble gases identify a billion-year-old radiogenically-enriched groundwater system
86Kr excess and other noble gases identify a billion-year-old radiogenically-enriched groundwater system Open
Deep within the Precambrian basement rocks of the Earth, groundwaters can sustain subsurface microbial communities, and are targets of investigation both for geologic storage of carbon and/or nuclear waste, and for new reservoirs of rapidl…
View article: Methane clumped isotope signature of anaerobic oxidation of methane
Methane clumped isotope signature of anaerobic oxidation of methane Open
<p>Microbial anaerobic oxidation of methane (AOM) significantly mitigates atmospheric methane emissions on Earth and represents a thermodynamically favorable metabolic strategy for astrobiological targets where methane has been detec…
View article: The role of porosity in H2/He production ratios in fracture fluids from the Witwatersrand Basin, South Africa
The role of porosity in H2/He production ratios in fracture fluids from the Witwatersrand Basin, South Africa Open
Abiotic H2 produced in the Precambrian lithospheric crust is a key substrate at the base of the metabolic chain of chemosynthetic and photosynthesis-independent microbial communities, significant to our understanding of life on early Earth…
View article: It’s all about the baseline - geochemical perturbations in hydrochronology
It’s all about the baseline - geochemical perturbations in hydrochronology Open
At surface recharge, atmospheric-equilibrated groundwater contains multiple geochemical components at trace levels, including short-lived isotopes (e.g. 3 H, 14 C, 81 Kr) produced via a combination of anthropogenic and natural processes.Th…
View article: Reversibility controls on extreme methane clumped isotope signatures from anaerobic oxidation of methane
Reversibility controls on extreme methane clumped isotope signatures from anaerobic oxidation of methane Open
View article: Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs
Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs Open
View article: N2 in deep subsurface fracture fluids of the Canadian Shield: Source and possible recycling processes
N2 in deep subsurface fracture fluids of the Canadian Shield: Source and possible recycling processes Open
View article: Crustal Groundwater Volumes Greater Than Previously Thought
Crustal Groundwater Volumes Greater Than Previously Thought Open
Global groundwater volumes in the upper 2 km of the Earth's continental crust—critical for water security—are well estimated. Beyond these depths, a vast body of largely saline and non‐potable groundwater exists down to at least 10 km—a vo…
View article: Earth-like Habitable Environments in the Subsurface of Mars
Earth-like Habitable Environments in the Subsurface of Mars Open
In Earth's deep continental subsurface, where groundwaters are often isolated for >106 to 109 years, energy released by radionuclides within rock produces oxidants and reductants that drive metabolisms of non-photosyn…
View article: Deep Trek: Science of Subsurface Habitability & Life on Mars
Deep Trek: Science of Subsurface Habitability & Life on Mars Open