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- W2040337437 abstract "Two Planosols developed on gravelly Quaternary sediments of the river Allier in the Limagne rift valley. Massif Central, France were studied. Parent material contained in addition to a granitic component large amounts of volcanic particles. Morphological, chemical, mineralogical and physical properties of both profiles were investigated to indicate some of the changes which have taken place during pedogenesis. Both profiles were characterized by pronounced textural contrasts between sandy A and E horizons and clayey B horizons. Soil formation rather than a transient depositional environment is thought to be responsible for this marked textural change. Clear dissolution features of all mineral grains, except quartz, and increasing amounts of volcanic fragments with depth suggested weathering. Increasing ratios of mobile basic cations to TiO2 with increasing depth corroborated this observation. The presence of non-laminated isotropic and anisotropic limpid clay coatings were also evidence of in-situ mineral weathering. In both profiles kaolinite predominated as clay mineral, and increased towards the surface. Micromorphological observations of microlaminated dusty and impure clay coatings in B horizons of both profiles were clear signs of clay illuviation. Bulk densities were high in lower E horizons and upper B horizons. Field observations and micromorphological data showed clear signs of periglacial features. The combination of pedogenic and periglacial processes has apparently lead to a considerable compaction. Abundant cemented iron and manganese features, predominantly occurring in E horizons suggested surface water gleying. Micromorphological observations of illuviation coatings in B horizons and of fine material in A and E horizons demonstrated grainy aspects suggesting ferrolysis." @default.
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- W2040337437 date "1988-12-01" @default.
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- W2040337437 title "Genesis of two Planosols in the Massif Central, France" @default.
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- W2040337437 doi "https://doi.org/10.1016/0016-7061(88)90046-8" @default.
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