Abstract
In order to find sediment storage zones into Jequitai hydrographic basin, 3D SRTM slope models were analyzed. These provided the identification of an anomalous drainage site located at Jequitai basin`s eastern portion between Espinhaco and Cabral ranges. Some contrasts of sedimentation pattern and valley cross-section along a short segment of Gameleira stream are good examples of these anomalies. Regional litho-structural analysis, including Cenozoic deformations, suggests that local variations of the Paraopeba Subgroup components is the main responsible for the observed fluvial system evolution. In addition, the northward tilting of Jequitai basin`s southern portion, in the Jequitai graben direction, increase the anomalous litho-structural effects. Log profiles suggest that alluvial fans coming probably from Espinhaco range covered the research sites. This work shows that some non-erosive fluvial segments are mistakenly explained as agradational when the investigation is supported only by geomorphological data obtained by remote sensing techniques. The studied segment presents morpho-sedimentary attributes that reflect the local geodiversity framework.
Highlights
The influence of the geodiversity of Cabral Range region on the Gameleira Stream morphologic variability
SRTM-derived slope models were analyzed to find sediment storage zones in Jequitaí hydrographic basin. Those data provided the identification of an anomalous drainage site located at Jequitaí basins eastern portion between Espinhaço and Cabral ranges
Log profiles suggest that alluvial fans coming probably from Espinhaço range covered the research sites
Summary
The influence of the geodiversity of Cabral Range region (northern Minas Gerais) on the Gameleira Stream morphologic variability. Resumo A análise de modelos de declividade da bacia do rio Jequitaí, gerados a partir de imagens SRTM, em busca de zonas de retenção de sedimentos, permitiu que fosse identificada uma área de drenagem anômala na porção oriental da bacia, entre as serras do Espinhaço e do Cabral.
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