A5019255882- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Radioactive element chemistry and processing
- Drilling and Well Engineering
- Planetary Science and Exploration
- CO2 Sequestration and Geologic Interactions
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Geotechnical and Geomechanical Engineering
- Groundwater and Isotope Geochemistry
- Rock Mechanics and Modeling
- Geological Studies and Exploration
- Advanced Proteomics Techniques and Applications
- earthquake and tectonic studies
- Soil Carbon and Nitrogen Dynamics
- Space Exploration and Technology
- Biomedical Text Mining and Ontologies
- Genetics, Bioinformatics, and Biomedical Research
- Medical Imaging Techniques and Applications
- Seismology and Earthquake Studies
Princeton University
2019-2024
Abstract Deep within the Precambrian basement rocks of Earth, groundwaters can sustain subsurface microbial communities, and are targets investigation both for geologic storage carbon and/or nuclear waste, new reservoirs rapidly depleting resources helium. Noble gas-derived residence times have revealed deep hydrological settings where preserved on millions to billion-year timescales. Here we report enriched in highest concentrations radiogenic products yet discovered fluids, with an...
Abstract Investigations of abiotic and biotic contributions to dissolved organic carbon (DOC) are required constrain microbial habitability in continental subsurface fluids. Here we investigate a large (101–283 mg C/L) DOC pool an ancient (>1Ga), high temperature (45–55 °C), low biomass (10 2 −10 4 cells/mL), deep (3.2 km) brine from uranium-enriched South African gold mine. Excitation-emission matrices (EEMs), negative electrospray ionization (–ESI) 21 tesla Fourier-transform ion...
Geochemical and isotopic fluid signatures from a 2.9–3.2 km deep, 45–55 °C temperature, hypersaline brine Moab Khotsong gold uranium mine in the Witwatersrand Basin of South Africa were combined with radiolytic water–rock exchange models to delineate evolution over geologic time, explore conditions for habitability. The brines (Ca-Na-Cl) 215–246 g/L TDS, Cl− concentrations up 4 mol/L suggesting their position as end-member significantly more saline than any previously sampled fluids....
Many ecosystems are experiencing an increase in drought conditions as a consequence of climate warming and changing precipitation patterns. The stress imposed by these environmental changes can affect ecosystem processes such the extracellular enzymatic degradation carbon-containing leaf litter soil microbial communities. However, magnitude impacts may depend on composition metabolism community. Based hypothesis local adaptation, communities native to warm-dry should display greater capacity...
The ICDP DSeis project accomplished full-core drilling and borehole-logging of the seismogenic zone 2014 M5.5 Orkney earthquake, South Africa. Three NQ-holes (total 1.6 km in length), drilled from 2.9 depth at Moab Khotsong gold mine, penetrated mostly intact hard rock, including Ga meta-sedimentary altered andesite (Crown) formations dipping ~20°SE. Subparallel gabbroic diorite sills intrude formations. After borehole Crown Formation approached steeply-dipping planar cluster...
<p>This paper reports on the outcomes of ICDP drilling into seismogenic zones M2.0-5.5 earthquakes in South African (SA) gold mines (DSeis; 2017-2018), follow-up work 2019, and planned post-drilling activity from 2020 onwards.</p><p>In deep SA mines, evolve ahead thin tabular excavations. Normal faulting prevails because mining enhances vertical maximum principal stress. At 1km depth at Cooke 4 mine, we elucidated evolution zone with a dense acoustic...