caa a22 4500 445814454 CHVBK 20180317145221.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10040-010-0647-4 doi (NATIONALLICENCE)springer-10.1007/s10040-010-0647-4 Millennial-scale diffusive migration of solutes in thick clay-rich aquitards: evidence from multiple environmental tracers [Elektronische Daten] [M. Hendry, L. Wassenaar] Migration diffuse à l'échelle millénaire de solutés dans des aquitards épais riches en argile: démonstration avec traceurs environnementaux multiples High-resolution one-dimensional profiles of naturally occurring environmental tracers (3H, δD, δ18O, 14C-DIC, 14C-DOC, 36Cl, 4He, and major ions) and hydraulic data were used to study residence times, transport mechanisms, and sources of pore water and solutes in an aquitard system in Saskatchewan, Canada. The aquitard system consisted of 80m of plastic clay-rich Battleford till discomformably overlying 77m of Late Cretaceous plastic marine clay. Individual tracers independently revealed molecular diffusion as the dominant transport mechanism in the unoxidized nonfractured till and clay. Transport modeling indicated that late Pleistocene-age pore water at 35-55m below ground was emplaced 15-30 thousand years Before Present (ka BP) during till deposition and ice retreat. The late Holocene climatic transition was estimated to have occurred 7-12ka BP. Differences in the timing of events determined with different tracers were attributed to inaccuracies in transport parameters and boundary condition assumptions. This study showed that solute transport in clay-rich aquitards can be accurately predicted for time scales beyond 20ka, and proved such aquitards are suitable for long-term isolation of most wastes. Springer-Verlag, 2010 Aquitard nationallicence Diffusion nationallicence Tracers nationallicence Waste disposal nationallicence Canada nationallicence Hendry M. Department of Geological Sciences, University of Saskatchewan, 114 Science Place, S7N 5E2, Saskatoon, SK, Canada aut Wassenaar L. Environment Canada, 11 Innovation Blvd., S7N 3H5, Saskatoon, SK, Canada aut Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 259-270 1431-2174 19:1<259 2011 19 10040 https://doi.org/10.1007/s10040-010-0647-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-010-0647-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hendry M. Department of Geological Sciences, University of Saskatchewan, 114 Science Place, S7N 5E2, Saskatoon, SK, Canada aut NATIONALLICENCE 700 1- Wassenaar L. Environment Canada, 11 Innovation Blvd., S7N 3H5, Saskatoon, SK, Canada aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 259-270 1431-2174 19:1<259 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer