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STUDIES ON THE BASALTIC SOILS OF NORTHERN IRELAND IV. MINERALOGICAL STUDY OF THE CLAY SEPARATES (<2μ)
Author(s) -
McALEESE D. M.,
MITCHELL W. A.
Publication year - 1958
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1958.tb01899.x
Subject(s) - vermiculite , montmorillonite , weathering , illite , clay minerals , basalt , soil water , geology , geochemistry , drainage , waterlogging (archaeology) , mineral , mineralogy , soil science , chemistry , paleontology , organic chemistry , ecology , wetland , biology
Summary The clay separates (<2μ) isolated from the horizons of ten basaltic soil profiles are shown by X‐ray analysis to have a mixedmineralogical composition; the type and amount of each mineral present being dependent on the drainage conditions within the profile. Kaolin, the end product of weathering, generally predominates in surface horizons. Vermiculite is formed in well‐drained profiles, but where gleying symptoms are evident vermiculite is replaced by montmorillonite, the amount of which increases with increased degree of waterlogging. Illite occurs in only two profiles to any appreciable extent. It is inferred that soil separates other than clay are contributing to the cationexchange capacity of these soils.