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Open Access Gênese de ferri-argilãs em horizontes B texturais de uma seqüência de solos sobre diabásio em Piracicaba (SP) Ferriargillan genesis in argillic B horizons of a soil sequence over diabase in Piracicaba

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Numa sequência de solos sobre diabásio localizada no campus da USP em Piracicaba a formação de ferri-argilãs e os processos de adensamento foram estudados. Foram realizados estudos morfológicos, micromorfológicos, de microscopia eletrônica de varredura e microanálise em amostras retiradas de três trincheiras localizadas nesta sequência. A presença de ferri-argilãs de iluviação foi observada nos horizontes B textural e na alterita principalmente preenchendo a porosidade mamelonar, policôncava e fissural provocando o adensamento dos mesmos. Evidências de hidromorfia temporária sugeriram que este processo estaria provocando a desestabilização das ligações ferro-argila facilitando assim a mobilização e redistribuição do ferro e da argila.&60;br&62;The formation of ferriargillans and densing processes were studied on a soil sequence over diabase situated in Piracicaba (SP) Brazil. Morphological, micromorphological, scanning electron microscopic and microanalytical studies were performed on samples taken from three trenches within the sequence. The presence of illuvial ferriargillans was observed mainly in the argillic B horizons and the saprolite, which filled the mamelonar, polyconcave and planar voids which led to their densing. Evidence of temporary hydromorphy suggested that this process would affect the stability of the iron oxide-clay interactions which would promote the mobilization and redistribution of iron and clay.
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Document Type: Research Article

Publication date: January 1, 2000

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