Sources of radiogenic helium in a clay till aquitard and its use to evaluate the timing of geologic events

Application of 2D resistivity profiling for mapping and interpretation of geology in a till aquitard near Luck Lake, Southern Saskatchewan, Canada

“…Quantifying groundwater flow through these aquitards has implications for solute transport in aquitards and protection of underlying aquifers (Shaw and Hendry 1998). Because of the extremely long time scales for groundwater flow and contaminant transport in till aquitards (over thousands of years or even longer), these formations can function as protective barriers against contaminant transport to more potable groundwater resources and allow them to be considered as historical hydrogeologic archives of ancient climates, geologic processes, and chemistry (Remenda 1993, Hendry 1988Hendry et al 2003Hendry et al , 2005. Hendry et al (2011) studied the vertical controls on solute transport in glacial till aquitard ([120 m thick) through seven boreholes in the area around Luck Lake using a high-resolution 1D stable isotope profiles.…”

Isotopic fractionation of noble gases by diffusion in liquid water: Molecular dynamics simulations and hydrologic applications

“…Dissolved noble gases have emerged as important geochemical indicators of both continental paleoclimate (Stute et al, 1995;Peeters et al, 2003;Hall et al, 2005) and mass transport in hydrological basins (Price et al, 2003;LaBolle et al, 2006), hydrocarbon reservoirs (Torgersen and Kennedy, 1999;Zhou et al, 2005), lacustrine sediments (Poreda et al, 2004;Brennwald et al, 2005), aquitards (Rü bel et al, 2002;Hendry et al, 2005), engineered clay barriers (Higashihara et al, 2005) and the oceans (Rodehacke et al, 2007). Despite this importance of noble gases in low-temperature geochemistry, remarkably few measurements of noble gas diffusion coefficients in liquid water have been reported.…”

CANCELLED Molecular dynamics simulations of noble gases in liquidwater: Solvati on structure, self-diffusion, and kinetic isotopeeffect

“…Dissolved noble gases have proven to be important geochemical indicators of transport 36 processes and paleoclimate in hydrogeological basins (1)(2)(3)(4)(5)(6)(7), lacustrine sediments (8)(9)(10), 37 aquitards (11)(12)(13), engineered clay barriers (14) and the oceans (15). Brennwald et al (10) used 38 Ne, Ar, Kr and Xe concentrations and 20 Ne/ 22 Ne and 36 Ar/ 40 Ar isotopic ratios to estimate rates of 39 methane release from anoxic lake sediments.…”