Weathering trends and parent material characteristics of polygenetic oxisols from Minas Gerais, Brazil: I. Mineralogy

dc.creatorMuggle, Cristine C.
dc.creatorBuurman, Peter
dc.creatorDoesburg, Jan D.J. van
dc.date2018-08-27T17:09:14Z
dc.date2018-08-27T17:09:14Z
dc.date2007-02-15
dc.date.accessioned2023-09-27T21:20:59Z
dc.date.available2023-09-27T21:20:59Z
dc.identifier00167061
dc.identifierhttps://doi.org/10.1016/j.geoderma.2006.10.008
dc.identifierhttp://www.locus.ufv.br/handle/123456789/21440
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8959100
dc.descriptionIn geologically stable areas in the tropics, climatic changes and geomorphic cycles give origin to polygenetic soils. Polygenesis involves new soil formation phases taking place on preweathered materials from previous phases, resulting in soils with rather similar chemical and mineralogical properties. Polygenetic soils from Minas Gerais, Brazil, were investigated with the purpose of distinguishing mineralogical aspects in relation to polygenesis. The soil materials were studied by micromorphology and electron microscope and analyzed by XRD. All soils are strongly weathered and even show weathered grains of ilmenite and quartz. The soils show two phases of kaolinite formation (pseudomorphs after mica and precipitation from solution) and of accumulation of iron compounds. Desilication causes gibbsite formation from kaolinite, occasionally even in the deep saprolite. Superposed processes can be due to progressively deeper weathering or to changes of the external environment.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherGeoderma
dc.relationv. 138, n. 1–2, p. 39- 48, fev. 2007
dc.rightsElsevier B.V.
dc.subjectOxisols
dc.subjectPolygenesis
dc.subjectSoil mineralogy
dc.subjectSoil micromorphology
dc.subjectSoil formation
dc.titleWeathering trends and parent material characteristics of polygenetic oxisols from Minas Gerais, Brazil: I. Mineralogy
dc.typeArtigo


Este ítem pertenece a la siguiente institución