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• W2000668024 abstract "At three sites in the Western Glaciated Plains, Warman and Luck Lake in Saskatchewan, Canada, and Bow River in Alberta, Canada, thick (≥ 30 m) till sequences contain ∼0.3–0.8% S by dry weight. In the unweathered zone (depths>2.5–15 m), 65–90% of this S is Cr-reducible pyrite. The remainder, largely organic S, is enriched in 34S by 6–12‰ relative to the pyrite. At the Bow River site, both pyrite and organic S are enriched in 34S (by up to 9‰) relative to samples of the same fractions from the Warman and Luck Lake sites. This may reflect a higher content of non-marine parent material in southern Alberta till. At the Warman site, the sources and dynamics of sulfur in the weathered zone were investigated. During weathering of the Floral Formation till, sulfate was produced by the oxidation of pyrite, and to a lesser extent by mineralization of organic S. Based on the distribution of SO4 in the landscape at Warman, three settings have been distinguished: upland, leached channel depression and saline ring. The upland setting has a > 9-m-thick weathered zone, which contains abundant SO4, mainly as secondary gypsum. Sulfate has been leached downward from the upper 2 m, creating a peak accumulation of gypsum at ∼3 m. Sulfate has been leached from the entire 2.5-m-deep weathered zone in the channel depression setting by seasonal infiltration of snow-melt and lateral flow. In contrast, at ∼3–4-m depth in the weathered zone at the edge of the channel, SO4 has accumulated as a saline ring; here the gypsum-S is up to 1% of the soil (dry weight). In the weathered zone of upland and saline ring settings, the δ 34S-values of the SO4 in sediment extracts (water-soluble) and groundwater (−13.1 to −9.0‰) are very similar to those of the total S (−12.0 to −11.4‰) and pyrite S (−16.0 to −10.1‰) of unweathered Floral Formation till. This indicates an in situ weathering source of the SO4. In contrast, the δ 34S of SO4 in sediment extracts and groundwater from the leached weathered zone of the upland and channel depression settings (−7.7 to −4.5‰) is enriched in 34S relative to unweathered Floral Formation till S. This enrichment may be attributed to either: (1) isotope fractionation during oxidation of pyrite, and/or (2) mineralization of residual organic S, which is 34S-enriched, after pyrite was weathered away." @default.
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• W2000668024 date "1994-01-01" @default.
• W2000668024 modified "2023-09-27" @default.
• W2000668024 title "Sources and dynamics of sulfur in weathered till, Western Glaciated Plains of North America" @default.
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• W2000668024 doi "https://doi.org/10.1016/0009-2541(94)90081-7" @default.
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