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- W2416576444 abstract "Abstract Various chemical extractions of Fe and Al from bulk soil samples, including Na-pyrophosphate (Fe p, Al p ), acid ammonium oxalate (Fe o , Al o ), and Na-dithionite (Fe d , Al d ), have been used over the last half century to distinguish soil ages over varying time frames from 10 2 to 10 6 years and even as far into antiquity as the Oligocene (30 × 10 6 ) years. Problems with mineral/chemical uniformity of sediments, free drainage of open system profiles, and variable climate over long time frames have produced problems and uncertainties as to just what each extraction removes from the bulk material analyzed. Some problems have been resolved by the work of Parfitt and Childs (1988); but some persist, especially with respect to the solubility of some extractant forms and the actual composition of others, particularly Al p, Al o , and Al d . A recent test of soils and paleosols in a fluvial chronosequence in southern Ontario illustrates the soil-paleosol evolutionary time trend over a period of ~ 11 ky, essentially post-Iroquois time in the Ontario basin (Jackson et al., 2000). This work highlights the importance of isolated, free draining weathering systems, mineral uniformity, and new relationships between secondary forms of Fe d and Al d , the latter previously considered of little importance in age relationship quests." @default.
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- W2416576444 date "2016-10-01" @default.
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- W2416576444 title "Iron and aluminum soil/paleosol extractions as age/environment indicators: Some examples from a catchment in southern Ontario, Canada" @default.
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- W2416576444 doi "https://doi.org/10.1016/j.geomorph.2016.05.030" @default.
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