Data/hora: 07/06/2024 09:32:33

Provedor de dados: | 90
País: | Brazil
Título: | Micromorphology and Genesis of Soils from Topolitosequences in the Brazilian Central Plateau
Autores: | Rolim Neto,Fernando Cartaxo; Schaefer,Carlos Ernesto Gonçalves Reynaud; Camêlo,Danilo de Lima; Corrêa,Marcelo Metri; Parahyba,Roberto da Boa Viagem; Caldas,Anildo Monteiro; Ibraimo,Anifo Soares Mamudo.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Ferralsols; Cambisols; Mafic rocks; Ultramafics; Perovskite; Tropical soils.
Resumo: | ABSTRACT The micromorphology of deeply weathered soils (Ferralsols/ Latossolos ) from the Central Plateau of Brazil remains little studied, and its affiliation to different parent materials, poorly known. To clarify the processes of soil formation of these acric, gibbsitic, Fe-oxide rich Ferralsols, three lithotoposequences on local ultrabasic to basic intrusive rocks were studied. The influences of mixing and pedobioturbation are evident in all soils, and Ferralsols of the Central Plateau of Brazil are polygenetic, based on the coarse mineral composition, with ultrabasic and metapelitic rock contributions. The typical oxic microstructure with stable microaggregates encompasses a gibbsite/Fe rich micromass with random inclusions of charcoal, allochthonous quartz, Ti-magnetite, and perovskite grains. Shallow Cambisols ( Cambissolos ) on tuffites also display a similar “oxic” microstructure, but a much lower degree of weathering. These Cambisols possesses apatite, and mafic and pelitic minerals as residuals minerals grains, indicating the polygenetic colluvia mixture of different substrates. The common occurrence of perovskite (CaTiO3) as a residual grain in deep-weathered, acric Ferralsols on ultrabasic rocks, not yet reported in the literature, shows an unusual resistant Ca reserve in oxic soils, though nothing is known about its implications to soil fertility.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100307
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/18069657rbcs20180219
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.43 2019
Fonte: | info:eu-repo/semantics/openAccess