Estratigrafia do Grupo Bambuí e coberturas fanerozóicas no vale do rio São Francisco, norte de Minas Gerais

Iglesias, Mario; Uhlein, Alexandre

doi:10.25249/0375-7536.2009392256266

Cited by 55 publications

(49 citation statements)

References 2 publications

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“…Such features are inherent to the parent material itself, as the top of the Santa Helena formation has siltstones constituted by mica, pyrite, and quartz (Iglesias and Uhlein, 2009). In fact, quartz predominates in the sand and silt fractions, with smaller amounts of mica and feldspar in the Bi horizon, which suggests an association of these minerals with the parent material and lithogenic inheritance (Kämpf et al, 1997;Teramoto et al, 2001).…”

Section: Soils Derived From Siltstonementioning

confidence: 99%

Mineralogy and Concentration of Potentially Toxic Elements in Soils of the São Francisco Sedimentary Basin

Ferreira

Coelho

Valladares

et al. 2018

Rev. Bras. Ciênc. Solo

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Lithological and geomorphological variations determine formation of soils with different mineralogical constitutions and can influence the distribution of potentially toxic elements (PTE). The aim of this study was to determine the contents of PTE and mineralogical assemblages along soil profiles of different classes and parent materials and to investigate the association among these factors in the São Francisco sedimentary basin in the northern part of the state of Minas Gerais (Brazil). Eight soil pedons of different classes that developed from different parent materials (limestone, siltstone, phyllite, alluvial-colluvial sediments, detrital cover, and rhythmite) were studied in two lithotoposequences. Soil morphological, particle-size, and chemical analyses were carried out for soil characterization and classification. A mineralogical investigation was carried out by X-ray diffraction on soil sand, silt, and clay fractions. Potentially toxic elements were extracted by microwave-assisted acid digestion (EPA 3015A method) and determined in an ICP-OES. Soil mineralogy showed relevant interactions between pedogenesis and morphogenesis. Quartz is the main mineral in the sand and silt fractions, with varying amounts of weatherable primary minerals, whereas kaolinite is the main mineral in the clay fraction, followed by 2:1 clay minerals and oxides. The main soil properties associated with PTE variability were pH, redox environment, mineral and organic reactive surfaces, and clay content. The unique patterns of PTE distribution per pedon and differences in PTE contents in soils from the same parent material, but with different pedogenic evolution, showed that pedogenic processes influence PTE distribution. Mainly Mn, Ni, Pb, and Ba were influenced by parent material, especially limestone, siltstone, and detrital cover, but Cd, As, and Cu were also influenced. To a lesser extent, Mo was influenced by phyllite and Cr by detrital cover and phyllite. Rhodic Ferralsol (Latossolo Vermelho Distrófico típico) was the only taxonomic class to show class association with PTE. The association of Ferralsols (Latossolos) with Cd, Mn, Ni, Pb, Ba, As, and Cu and the low contents of these elements in soils of this class suggest that pedogenic processes common to Ferralsol (Latossolo) evolution are responsible for decreasing levels of these PTE.

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Section: Soils Derived From Siltstonementioning

confidence: 99%

Mineralogy and Concentration of Potentially Toxic Elements in Soils of the São Francisco Sedimentary Basin

Ferreira

Coelho

Valladares

et al. 2018

Rev. Bras. Ciênc. Solo

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“…O rio Peruaçu é uma vereda em grande parte do seu curso (AUGUSTIN, 2009;AUGUSTIN & MAIA-RODRI-GUES, 2012;VIOTTI, 2013;LUCENA, 2013;VIO-TTI & AUGUSTIN, 2015), banhando áreas de rochas siliciclásticas cretáceas do Grupo Urucuia e coberturas quaternárias associadas (IGLESIAS & UHLEIN, 2009). Do médio curso em diante, torna-se um típico rio de carste (fl uviocarste), correndo sobre calcários do Grupo Bambuí (PILÓ & RUBIOLLI, 2002;RODET et al, 2009) e, posteriormente, sedimentos aluviais da planície da margem esquerda Rio São Francisco (AUGUSTIN & MAIA-RODRIGUES, 2012).…”

Section: Materiais E Métodosunclassified

Estudo Das Coberturas Superficiais Na Interface Cerrado-Vereda No Norte De Minas Gerais

Neves

Menezes

Oliveira

et al. 2015

Rev. Bras. Geomorfol.

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Resumo:Embora sejam contempladas por pesquisas que abordam seus diversos aspectos naturais, com ênfase biológica, as veredas carecem de estudos sobre suas geocoberturas e das encostas associadas, incluindo os solos. Este estudo buscou analisar essas coberturas e suas relações com a dinâmica do canal fl uvial, tendo como área de investigação a vereda/rio Peruaçu, afl uente do Rio São Francisco, localizada no norte de Minas Gerais. Estudos dessa natureza podem elucidar mecanismos hidrogeomorfológicos presentes no desenvolvimento e manutenção da água no canal, bem como nas características e especifi cidades das coberturas superfi ciais. A metodologia envolveu a identifi cação e caracterização de uma vertente na zona de cabeceira através de medidas e observações ao longo de um Informações sobre o Artigo

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“…The main substrate of the São Francisco Craton is the Bambuí Group, which formed as an association of siliciclastic and biochemical lithofacies (Iglesias and Uhlein 2009) with a high occurrence of carbonate rocks. Most of the rocks within the São Francisco Craton exhibit little deformation, which is consistent with the relatively low level of tectonic activity that has occurred in the area since its individualisation as a cratonic area.…”

Section: The São Francisco Cratonmentioning

confidence: 99%

Long-Term Geomorphological Evolution of the Brazilian Territory

Salgado

Bueno

Diniz

et al. 2015

World Geomorphological Landscapes

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In Brazil, there is great diversity in the geomorphological evolution of landscapes as a result of the country's massive geographical size (over 8.5 million km 2 ). Diverse climates and palaeoclimates acting on different tectonic compartments, substrates, and reliefs have generated a rich diversity of natural landscapes. The Brazilian territory can be broadly divided into two tectonic mega-compartments: Amazonian Brazil and Atlantic Brazil (ExtraAmazonian Brazil). These two compartments are separated by a lineament known as the Transbrasiliano Lineament, which crosses the country in a southwest to northeast direction. Amazonian Brazil is characterised by lower elevations and a more uniform relief, whereas Atlantic Brazil contains higher elevations and exhibits greater topographic diversity and complexity. KeywordsLong-term relief evolution Á Amazonian Brazil Á Atlantic Brazil Á Transbrasiliano Lineament

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Estratigrafia do Grupo Bambuí e coberturas fanerozóicas no vale do rio São Francisco, norte de Minas Gerais

Cited by 55 publications

References 2 publications

Mineralogy and Concentration of Potentially Toxic Elements in Soils of the São Francisco Sedimentary Basin

Mineralogy and Concentration of Potentially Toxic Elements in Soils of the São Francisco Sedimentary Basin

Estudo Das Coberturas Superficiais Na Interface Cerrado-Vereda No Norte De Minas Gerais

Long-Term Geomorphological Evolution of the Brazilian Territory

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