Aspectos pedogeomorfológicos e mineralógicos de uma topossequência de solos gnáissicos no Complexo Bação – Quadrilátero Ferrífero, MG, Brasil.

dc.contributor.authorFigueiredo, Múcio do Amaral
dc.contributor.authorVarajão, Angélica Fortes Drummond Chicarino
dc.contributor.authorFabris, José Domingos
dc.contributor.authorLoutfi, Ivan Soares
dc.date.accessioned2017-07-11T16:04:02Z
dc.date.available2017-07-11T16:04:02Z
dc.date.issued2002
dc.description.abstractThe mineralogical association of the weathering rocks and their pedogenic process is fundamental in order to understand the erosive susceptibility of the soils. The regolith of the southern area of the Complexo Bação, Quadrilátero Ferrífero, Minas Gerais, was developed from gneiss and has as its predominant characteristic a thick saprolite (around 20 m) overlaid by a solum (A + B horizons) with of less than 3 m thick. This thickness is much thinner than those that frequently occur in the gneiss regolith from tropical and intertropical regions. In the toposequence investigated, the upper slope profile is a cambic soil with a poorly developed B horizon and with many relictal weathered gneiss nodules at the bottom, closer to the saprolite. The mineralogical composition of this B horizon is mainly kaolinite, gibbsite, quartz, hematite and goethite and secondarily pseudomorphous feldspars. The middle slope profile is a latosol with a well developed and thick B horizon. The mineralogical composition of this B horizon is essentially formed by kaolinite, gibbsite, quartz, hematite and goethite. The lower slope profile is a cambic latosol with the presence of relictal gneiss nodules in the B horizon analogously to the B horizon from the upper slope profile. Their mineralogical composition are also similar. The pedogeomorphological evolution of the studied catenary sequence shows that the middle slope profile is allochthonous with an accumulation of colluvial materials that formed a well developed latosol B horizon without primary minerals. The source of the colluvial materials is the upper slope profile. In the lower slope segment the lack of colluvial material suggests a process of incision, with channel and perennial flows that were originated from the adjacent gullies. The incipient fluvial plain that was formed occurs in abrupt altimetric unconformity (declivity rupture) with the lower slope segment.pt_BR
dc.identifier.citationFIGUEIREDO, M. de A. et al. Aspectos pedogeomorfológicos e mineralógicos de uma topossequência de solos gnáissicos no Complexo Bação – Quadrilátero Ferrífero, MG, Brasil. Pesquisas em Geociências, Porto Alegre, v. 29, p. 81-90, 2002. Disponível em: <https://seer.ufrgs.br/PesquisasemGeociencias/article/view/19599>. Acesso em: 20 de jun. 2017.pt_BR
dc.identifier.doihttps://doi.org/10.22456/1807-9806.19599
dc.identifier.issn1807-9806
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/8219
dc.language.isopt_BRpt_BR
dc.rightsabertopt_BR
dc.rights.licenseO periódico Pesquisas em Geociências permite o depósito da versão pós-print de um artigo. Permite remixagem, adaptação e nova criação a partir da obra para fins não comerciais desde que seja atribuído o crédito ao autor (CC BY-NC). Fonte: Diadorim <https://diadorim.ibict.br/handle/1/2352>. Acesso em: 04 maio 2020.
dc.subjectWeatheringpt_BR
dc.subjectPedogeomorphologypt_BR
dc.subjectSlope processespt_BR
dc.titleAspectos pedogeomorfológicos e mineralógicos de uma topossequência de solos gnáissicos no Complexo Bação – Quadrilátero Ferrífero, MG, Brasil.pt_BR
dc.typeArtigo publicado em periodicopt_BR
Arquivos