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Clay Minerals, Humus Complexes, and Classification of Four “Andepts” of Maui, Hawaii
Author(s) -
Wada K.,
Kakuto Y.,
Ikawa H.
Publication year - 1986
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/sssaj1986.03615995005000040035x
Subject(s) - allophane , imogolite , andosol , soil water , geology , humus , udic moisture regime , clay minerals , mineralogy , hematite , goethite , pedology , pedogenesis , volcanic ash , andesite , geochemistry , soil science , chemistry , loam , volcanic rock , volcano , organic chemistry , adsorption
Clay minerals and humus complexes in the Pane, Kula, Kaipoioi, and Olinda soils, derived from basalt‐andesitic to andesitic volcanic ash on Maui, Hawaii, were studied by a combination of methods. These soils have ustic soil moisture regimes except for the Olinda, which has an udic moisture regime. The clay content of all soil samples was high (35‐73%). Allophane and/or noncrystalline Fe oxides were abundant in the Pane, Kula, and Kaipoioi soils, but they were not identified or were present only in small amounts in the Olinda soil. In the Olinda soil, layer silicates, largely of eolian origin, and hematite were major clay components. Substantial amounts of halloysite and imogolite were found in the surface and subsurface horizons, respectively, of the Pane soil. Maghemite or hematite and magnetite were major silt and fine sand components in all samples and the content of weatherable minerals was <10% except for the Kaipoioi soil. Iron and Al bound with humus increased in the soils in the order of Pane