A mottled, non-lithified paleosol in Brazil: diagnosis by morphological and mineralogical features

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorZinn, Yuri Lopes-
Autor(es): dc.creatorMiranda, Camila Fernandes-
Data de aceite: dc.date.accessioned2026-02-09T11:38:00Z-
Data de disponibilização: dc.date.available2026-02-09T11:38:00Z-
Data de envio: dc.date.issued2021-12-07-
Data de envio: dc.date.issued2021-12-07-
Data de envio: dc.date.issued2020-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/48651-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1143969-
Descrição: dc.descriptionThe identification of paleosols is difficult when no buried horizons or lithification occur. Here, we described the identification of a possible paleosol, its characterization, and which features supported its positive diagnosis. In a construction site, a vertical cut exposed an unusual red–yellow mottling with massive structure and channels (probably faunal), in contrast with the overlying homogeneous red Oxisol with fine granular structure. A similar but more deferrified section with white–yellow mottling also occurred nearby, and both were sampled as large clods. In thin sections, many oriented clay coatings occur along channel voids, suggesting illuviation, as well as dissolving Fe nodules and Mn coatings along planar and channel voids. X-ray diffraction showed a clay dominated by kaolinite, traces of illite, and absence of gibbsite, again contrasting with the gibsitic-kaolinitic clay of the Oxisol. We confirmed the diagnosis of a Paleoultisol due to the following incompatibilities with the overlying Oxisol: (1) massive, apedal structure, and higher bulk density; (2) clay coatings indicative of illuviation as key soil-forming process; (3) low clay contents in particle-size analysis due to cementation; (4) very low organic carbon consistent with long-term inhumation; and (5) kaolinitic–illitic clay. The unusual granular microstructure of the B horizon of the Oxisol is partly derived from disintegration and desilication of the Paleoultisol.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Publicador: dc.publisherMDPI-
Direitos: dc.rightsAttribution 4.0 International-
Direitos: dc.rightsAttribution 4.0 International-
Direitos: dc.rightsacesso aberto-
Direitos: dc.rightshttp://creativecommons.org/licenses/by/4.0/-
Direitos: dc.rightshttp://creativecommons.org/licenses/by/4.0/-
???dc.source???: dc.sourceMinerals-
Palavras-chave: dc.subjectPedology-
Palavras-chave: dc.subjectTropical soils-
Palavras-chave: dc.subjectSoil micromorphology-
Palavras-chave: dc.subjectSoil mineralogy-
Palavras-chave: dc.subjectPedologia-
Palavras-chave: dc.subjectSolos tropicais-
Palavras-chave: dc.subjectMicromorfologia do solo-
Palavras-chave: dc.subjectMineralogia do solo-
Título: dc.titleA mottled, non-lithified paleosol in Brazil: diagnosis by morphological and mineralogical features-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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