A5047933708- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Geological formations and processes
- Geological and Geochemical Analysis
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Geological and Tectonic Studies in Latin America
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
- Groundwater and Watershed Analysis
- Hybrid Renewable Energy Systems
- Pleistocene-Era Hominins and Archaeology
- Karst Systems and Hydrogeology
- Geophysical Methods and Applications
- Seismic Imaging and Inversion Techniques
- Spacecraft and Cryogenic Technologies
- Soil erosion and sediment transport
- Lichen and fungal ecology
- Seismic Waves and Analysis
- Hydrogen Storage and Materials
- Aquatic and Environmental Studies
- Geological Studies and Exploration
University of Utah
2010-2023
Utah Water Science Center
2018-2023
New Mexico Water Science Center
2023
Pennsylvania State University
2015-2022
Utah Geological Survey
2019-2022
United States Department of the Interior
2013
United States Geological Survey
2013
IsoForensics
2012
Arthur D. Little (United States)
1994-1997
[1] The Pamir plateau forms a prominent tectonic salient along the western end of Tibet-Tarim margin. Despite its significance, relatively little is known about timing major Cenozoic events in Pamir. Here we present new apatite and zircon (U/Th)-He ages, bulk rock geochemistry, Al-in-hornblende barometry results from Karakul graben, north-south oriented rift basin located ∼50 km south Main Thrust. Although cooling ages do not record onset extension, graben-bounding normal faults provide...
The hydrologic connectivity between hillslopes and streams impacts the geomorphological evolution of catchments. Here, we propose a conceptual model for hydrogeomorphological Susquehanna Shale Hills Critical Zone Observatory (SSHCZO), first-order catchment developed on shale in central Pennsylvania, U.S.A. At SSHCZO, majority available water (the difference incoming meteoric outgoing evapotranspiration) flows laterally to outlet as interflow, while rest is transported by regional groundwater...
Abstract Focused groundwater discharge in closed basins provides opportunities to investigate mechanisms for closing hydrologic and solute budgets arid regions. The Salar de Atacama (SdA), adjacent the Central Andean Plateau hyperarid Desert, an extreme example of halite (>1800 km 3 ) lithium brine (~5000 ppm) accumulation spanning late Miocene present. Minimum long‐term water needed sustain over this timescale at SdA is 9–20 times greater than modern recharge (and double wet‐climate...
Abstract We document, analyse, and interpret direct rapid infiltration of precipitation to the southern margin Salar de Atacama halite‐hosted brine aquifer during two intense events in 2012–2013. present physical, geochemical, stable radioactive isotope data detail this influx water. The differ distinctly mechanisms recharge. 2012 event did not produce onto salar surface, while 2013 did. Both are recorded by abrupt changes head observation wells along halite margin. Spatially distributed...
The environmental impacts of shale-gas development on water resources, including methane migration to shallow groundwater, have been difficult assess. Monitoring around gas wells is generally limited domestic water-supply wells, which often are not situated along predominant groundwater flow paths. A new concept tested here: combining stream hydrocarbon and noble-gas measurements with reach mass-balance modeling estimate thermogenic concentrations fluxes in discharging streams constrain...
This report is part of an effort by the U.S. Geological Survey to update existing mineral deposit models and develop new ones. The global transition away from hydrocarbons toward energy alternatives increases demand for many scarce metals. Among these lithium, a key component lithium-ion batteries electric hybrid vehicles. Lithium brine deposits account about three-fourths world’s lithium production. Updating earlier model, we emphasize geologic information that might directly or indirectly...
Strontium isotope analysis has proven useful in geo‐location investigations of organic and inorganic materials may complement the region‐of‐origin information provided by hydrogen oxygen stable analysis. In this study, we analyzed 99 drinking (tap) water samples collected from 95 municipal systems across USA to investigate potential that 87 Sr/ 86 Sr can be used provenance managed hydrological systems. Results a leaching exchange experiment demonstrated non‐ideal storage conditions did not...
The Salt Lake Valley, UT, USA, is proximal to the desiccating Great (GSL). Prior work has found that this lakebed/playa contributes metals-laden dust snow in Wasatch and Uinta Mountains. Dust industrial particulate pollution are also delivered communities along Front, but their sources, compositions, fluxes poorly characterized. In study, we analyzed deposited 18 passive samplers positioned near GSL, cities Valley for total flux, <63 µm fraction,
Abstract A broad array of new provenance and stable isotope data are presented from two magnetostratigraphically dated sections in the south‐eastern Issyk Kul basin Central Kyrgyz Tien Shan. The results here discussed interpreted for plausible magnetostratigraphic age models. combination zircon U‐Pb provenance, paleocurrent conglomerate clast count analyses is used to determine sediment provenance. This analysis reveals that first coarse‐grained, syn‐tectonic sediments (Dzhety Oguz...
Abstract In the critical zone, surficial bedrock interactions result in formation of a mantle chemically‐ and physically‐altered material defined here as regolith. watershed Río Icacos, an upland river draining Luquillo Mountains tropical Puerto Rico, we explored influence lithology (quartz diorite versus hornfels‐facies volcaniclastic rock) on weathering. Regolith profiles were studied by drilling boreholes imaging subsurface using ground penetrating radar (GPR). Overall, regolith structure...
Just as microscopic observations show that minerals dissolve quickly at sites where defects intersect the water-crystal interface and slowly zones of perfect lattice structure, weathering rates also vary across a landscape. Specifically, landscape scale, dissolution (weathering) occurs faster (fractures) land surface, slower in unfractured zones. In rain forest Puerto Rico, for example, we used ground penetrating radar to document how deep fracture allow meteoric waters accelerate Luquillo...
Abstract New techniques are needed to distinguish between leakage of methane (CH 4 ) into surface waters from gas wells and natural sources. Here, scientists worked with >50 citizen in a hydrocarbon‐rich basin (Pennsylvania, U.S.A.) measure concentrations ([CH ]) streams. These measurements were combined published observations form reconnaissance dataset. The dataset was then used categorize sites as background or impacted by other sources gas. For 479 samples at 131 sites, 470...
Abstract The Rio Icacos watershed in the Luquillo Mountains (Puerto Rico) is unique due to its extremely rapid weathering rates. incised into a quartz diorite that has developed large knickzone defining river profile. Regolith thickness within generally decreases from 20 30 m at ridges several meters diorite‐dominated valley tens of centimeters near major knickpoint, as determined previous studies. Above knickzone, we observe spheroidal corestones, but below this much less apparent. Measured...