Post-depositional changes in the pore-water chemistry of the sensitive marine clays of the Ottawa area, eastern Canada
✍ Scribed by J. Kenneth Torrance
- Book ID
- 103071500
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 773 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0013-7952
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✦ Synopsis
The pore-water chemistry is reported for four sites in the Ottawa area. The present cation concentrations in the pore water are compared with the best estimates of the initial salinity conditions within the sediments. It is observed that leaching has occurred at all sites and is largely associated with downward movement of infiltrating rainfall. At one of the sites upward diffusion of salts along a concentration gradient appears to have been important.
High-salinity zones in the borings exhibited low sensitivities, whereas leached zones exhibited variable sensitivities. Where the sensitivity in the leached zones is high the pore water usually contains very low concentrations of Ca, Mg and K and a high proportion of Na, and where the sensitivity is low the Ca and Mg concentrations are higher, presumably as a result of a mild weathering of the soil material, and the proportion of Na is love. The roles of leaching and intense and mild weathering in influencing the geotechnical properties of these Postglacial marine clays are discussed.