journal article

• Deep fracture fluids isolated in the crust since the Precambrian era.  Nature.  497:357-360. 2013
• Anaerobic Conversion of Chlorobenzene and Benzene to CH 4 and CO 2 in Bioaugmented Microcosms .  Environmental Science & Technology.  47:2378-2385.
• Carbon and Hydrogen Isotopic Composition of Methane and C 2 Alkanes in Electrical Spark Discharge: Implications for Identifying Sources of Hydrocarbons in Terrestrial and Extraterrestrial Settings .  Astrobiology.  13:483-490.
• Measurement of the 13 C/ 12 C of Atmospheric CH 4 Using Near-Infrared (NIR) Cavity Ring-Down Spectroscopy .  Analytical Chemistry.  85:11250-11257.
• A metagenomic window into carbon metabolism at 3 km depth in Precambrian continental crust.  The ISME Journal.  10:730-741.
• A model of diffuse degassing at three subduction-related volcanoes.  Bulletin of Volcanology.  62:130-142.
• ABIOTIC METHANE ON EARTH.  Reviews of Geophysics.  51:276-299.
• Abiogenic formation of alkanes in the Earth's crust as a minor source for global hydrocarbon reservoirs.  Nature.  416:522-524.
• Abiotic formation of hydrocarbons under hydrothermal conditions: Constraints from chemical and isotope data.  Geochimica et Cosmochimica Acta.  71:1982-1998.
• An oligotrophic deep-subsurface community dependent on syntrophy is dominated by sulfur-driven autotrophic denitrifiers.  Proceedings of the National Academy of Sciences.  113:E7927-E7936.
• Capture of Planktonic Microbial Diversity in Fractures by Long-Term Monitoring of Flowing Boreholes, Evander Basin, South Africa.  Geomicrobiology Journal.  28:275-300.
• Carbon Kinetic Isotope Effects Reveal Variations in Reactivity of Intermediates in the Formation of Protonated Carbonic Acid.  The Journal of Organic Chemistry.  78:12176-12181.
• Dissolved Organic Matter Compositions in 0.6–3.4 km Deep Fracture Waters, Kaapvaal Craton, South Africa.  Organic Geochemistry.  118:116-131.
• Eukaryotic opportunists dominate the deep-subsurface biosphere in South Africa.  Nature Communications.  6:8952.
• Exchange catalysis during anaerobic methanotrophy revealed by 12CH2D2 and 13CH3D in methane.  Geochemical Perspectives Letters.  26-30.
• Exchange catalysis during anaerobic methanotrophy revealed by12CH2D2&13CH3D in methane.  Geochemical Perspectives Letters. 
• Fluctuations in populations of subsurface methane oxidizers in coordination with changes in electron acceptor availability.  FEMS Microbiology Ecology.  94:fiy089.
• Insights into deep carbon derived from noble gases.  Nature Geoscience.  2:543-547.
• Isotopic signatures of CH4 and higher hydrocarbon gases from Precambrian Shield sites: A model for abiogenic polymerization of hydrocarbons.  Geochimica et Cosmochimica Acta.  72:4778-4795.
• Measurement of a Doubly Substituted Methane Isotopologue, 13 CH 3 D, by Tunable Infrared Laser Direct Absorption Spectroscopy .  Analytical Chemistry.  86:6487-6494.
• Methane sources and sinks in continental sedimentary systems: New insights from paired clumped isotopologues 13CH3D and 12CH2D2.  Geochimica et Cosmochimica Acta.  245:327-351.
• Neon identifies two billion year old fluid component in Kaapvaal Craton.  Chemical Geology.  283:287-296.
• New ecosystems in the deep subsurface follow the flow of water driven by geological activity.  Scientific Reports.  9:3310.
• Noble gas and carbon isotopic evidence for CO2-driven silicate dissolution in a recent natural CO2 field.  Earth and Planetary Science Letters.  341-344:10-19.
• Nonequilibrium clumped isotope signals in microbial methane.  Science.  348:428-431.
• Phylogeny and phylogeography of functional genes shared among seven terrestrial subsurface metagenomes reveal N-cycling and microbial evolutionary relationships.  Frontiers in Microbiology.  5.
• South African crustal fracture fluids preserve paleometeoric water signatures for up to tens of millions of years.  Chemical Geology.  493:379-395.
• Sulfur mass-independent fractionation in subsurface fracture waters indicates a long-standing sulfur cycle in Precambrian rocks.  Nature Communications.  13252.
• The contribution of the Precambrian continental lithosphere to global H2 production.  Nature.  516:379-382.
• The influence of carbon source on abiotic organic synthesis and carbon isotope fractionation under hydrothermal conditions.  Geochimica et Cosmochimica Acta.  74:2717-2740.
• The origin of NO3- and N-2 in deep subsurface fracture water of South Africa.  Chemical Geology.  294-295:51-62.
• The relative abundances of resolved 12CH2D2 and 13CH3D and mechanisms controlling isotopic bond ordering in abiotic and biotic methane gases.  Geochimica et Cosmochimica Acta.  203:235-264.
• Variations in microbial carbon sources and cycling in the deep continental subsurface.  Geochimica et Cosmochimica Acta.  173:264-283.
• ‘Follow the Water’: Hydrogeochemical Constraints on Microbial Investigations 2.4 km Below Surface at the Kidd Creek Deep Fluid and Deep Life Observatory.  Geomicrobiology Journal.  1-14.