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Mineralogical and Chemical Characteristics of Soils in Loess Overlying Shale in Northwestern Illinois
Author(s) -
Jones Robert L.,
Ray B. W.,
Fehrenbacher J. B.,
Beavers A. H.
Publication year - 1967
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1967.03615995003100060026x
Subject(s) - weathering , loess , silt , soil water , illite , vermiculite , geology , clay minerals , montmorillonite , geochemistry , oil shale , soil production function , parent rock , soil science , pedogenesis , mineralogy , environmental chemistry , geomorphology , chemistry , paleontology , organic chemistry
Eleroy and Derinda soils (Typic Hapludalfs) and Keltner and Schapville soils (Typic Argiudolls) were studied. Weathering of silt‐size minerals is not advanced in these relatively youthful soils. Iron is the most sensitive indicator of weathering, being particularly labile in the Hapludalf profiles. Iron weathers from silt‐size minerals and is localized in concretions and in the clay fraction. Clay‐mineral weathering involves formation of chloritized vermiculite and montmorillonite from illite and montmorillonite precursors. The stage of weathering of these soils approximates that in Clinton, Fayette (Hapludalfs), and Tama (Argiudoll) soils that occur along the Mississippi River. Soil test values for K and P and amounts of exchangeable K and total P are high. Productivity is related more to depth of underlying shale and attendant physical effects than to nutrient status.