Browsing Earth and Environmental Sciences by Title
Now showing items 396-415 of 434
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Tectonic Stresses and Injection-Induced Fault Slip Assessment
(University of Waterloo, 2022-09-14)Understanding the Earth's stress state at depth is fundamental to a wide variety of subsurface projects, ranging from seismology projects to studies on underground energy storage or extraction. The primary objectives of ... -
Temporal record of osmium concentrations and 187Os/188Os in organic-rich mudrocks: Implications for the osmium geochemical cycle and the use of osmium as a paleoceanographic tracer
(Elsevier, 2017-11-01)We present a compilation of 192Os concentrations (representing non-radiogenic Os) and initial 187Os/188Os isotope ratios from organic-rich mudrocks (ORM) to explore the evolution of the Os geochemical cycle during the ... -
The Ten Stone Ranges Structural Complex of the central Mackenzie Mountains fold-and-thrust belt: a structural analysis with implications on the Plateau Fault and regional detachment level
(University of Waterloo, 2009-09-01)The Cordilleran Orogen affected majority of the western margin of ancient continental North America in the Cretaceous, which is well recorded in the Foreland Belt. The Mackenzie Mountains fold-and-thrust belt is located ... -
Th/U ratios in metamorphic zircon
(Wiley, 2018-03-05)The Th/U ratios of zircon crystals are routinely used to help understand their growth mechanism. Despite the wide application of Th/U ratios in understanding the geological significance of zircon U–Pb ages, the main controls ... -
Thermo-Hydro-Mechanical Behavior of Conductive Fractures using a Hybrid Finite Difference – Displacement Discontinuity Method
(University of Waterloo, 2013-06-21)Large amounts of hydrocarbon reserves are trapped in fractured reservoirs where fluid flux is far more rapid along fractures than through the porous matrix, even though the volume of the pore space may be a hundred times ... -
Three-dimensional imaging of aquifer and aquitard heterogeneity via transient hydraulic tomography at a highly heterogeneous field site
(Elsevier, 2018-04-01)Previous studies have shown that geostatistics-based transient hydraulic tomography (THT) is robust for subsurface heterogeneity characterization through the joint inverse modeling of multiple pumping tests. However, the ... -
Towards Quantifying Groundwater Resources of the Paloluoma Buried Bedrock Valley in Western Finland with Groundwater Modelling
(University of Waterloo, 2022-05-03)Groundwater provides about 60 percent of drinking water in Finland. In western Finland, drinking water for the town of Kurikka (pop. ~21 700) comes from glaciofluvial aquifers confined underneath thick glaciomarine aquitards ... -
Trace elements at the intersection of marine biological and geochemical evolution
(Elsevier, 2016-12-01)Life requires a wide variety of bioessential trace elements to act as structural components and reactive centers in metalloenzymes. These requirements differ between organisms and have evolved over geological time, likely ... -
The Tracing of a Contaminant (Tritium) from Candu Sources: Lake Ontario
(University of Waterloo, 1997)In any research program we begin with a hypothesis and when our expected results do not concur with the observed results we must try and understand the dynamics behind the changed process. In this study we were trying ... -
Tracing Redox Cycles during Microbe-Clay Interactions Using Stable Iron Isotopes
(University of Waterloo, 2018-10-17)Iron redox cycling, especially Fe(III) reduction, is mostly driven by microbial activity in the shallow subsurface. A wide range of bacteria, archaea, and fungi reduce Fe(III) to acquire energy with soil organic compounds ... -
Transient episodes of mild environmental oxygenation and oxidative continental weathering during the late Archean
(American Association for the Advancement of Science, 2015-11-20)It is not known whether environmental O2 levels increased in a linear fashion or fluctuated dynamically between the evolution of oxygenic photosynthesis and the later Great Oxidation Event. New rhenium-osmium isotope data ... -
Transport and Retention of Particulate Organic Matter in Riverbed Sediments: Laboratory Experiments and Modelling
(University of Waterloo, 2022-09-22)Infiltration of river water into riverbeds can deliver particulate organic matter (POM: the remains of plants, algae, and other life), which has an important role for transforming nutrients in watersheds. Once POM is ... -
Transport of chloride and deuterated water in peat: The role of anion exclusion, diffusion, and anion adsorption in a dual porosity organic media
(Elsevier, 2019-08)The dual-porosity structure of peat and the extremely high organic matter content give rise to a complex medium that typically generates prolonged tailing and early 50% concentration breakthrough in the breakthrough curves ... -
Treatment of a PHC Source Zone using Land Application of Sulfate
(University of Waterloo, 2015-02-23)This pilot-scale experiment was performed in the sand pit area at the University of Waterloo Groundwater Research Facility at CFB Borden located near Alliston, ON. A multicomponent PHC source zone (3 m x 3 m) was emplaced ... -
Treatment of Water-borne Nutrients, Pathogens, and Pharmaceutical Compounds using Basic Oxygen Furnace Slag
(University of Waterloo, 2013-09-27)Phosphorus (P) is one of the essential nutrients for living organisms; however, excess P in aquatic systems often causes environmental and ecological problems including eutrophication. Removal of P from domestic wastewater, ... -
THE TULU KAPI GOLD DEPOSIT OF THE WESTERN ETHIOPIAN SHIELD: STRUCTURAL FRAMEWORK, U-PB ZIRCON GEOCHRONOLOGY AND PARAGENESIS
(University of Waterloo, 2019-04-10)Gold production dates back millennia in the Arabian Nubian Shield. Most of the mined deposits are in the northern portions of the shield, with little know about its southern extent. Tulu Kapi is a rare example of a gold ... -
Two centuries of nitrogen dynamics: Legacy sources and sinks in the Mississippi and Susquehanna River Basins
(American Geophysical Union, 2017-01-07)Global flows of reactive nitrogen (N) have increased significantly over the last century in response to agricultural intensification and elevated levels of atmospheric deposition. Despite widespread implementation conservation ... -
Uncertainty-based multi-criteria calibration of rainfall-runoff models: a comparative study
(Springer, 2014-08-01)This study compares formal Bayesian inference to the informal generalized likelihood uncertainty estimation (GLUE) approach for uncertainty-based calibration of rainfall-runoff models in a multi-criteria context. Bayesian ... -
Uranium and Molybdenum Isotope Constraints on Ocean Redox Conditions During Deposition of the Upper Devonian Kettle Point Formation, Ontario
(University of Waterloo, 2016-10-18)The Late Devonian extinction event was among the most severe Phanerozoic mass extinction events, which led to a decline in the abundance and diversity of marine and terrestrial ecosystems, particularly tropical shallow-marine ... -
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
(Elsevier, 2015-05-01)To improve estimates of the extent of ocean oxygenation during the late Ediacaran Period, we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic-rich mudrocks (ORM) of Member IV, upper ...