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| Corrêa,Marcelo Metri; Ker,João Carlos; Araújo Filho,José Coelho de; Camêlo,Danilo de Lima. |
| Na unidade geomorfológica dos Tabuleiros Costeiros dominam os solos com horizontes coesos, e alguns deles têm a presença de horizontes cimentados comumente do tipo fragipã. Esses horizontes interferem na dinâmica da água, no crescimento de raízes e, consequentemente, na nutrição mineral de plantas. O objetivo deste trabalho foi avaliar, por meio da dissolução seletiva, a participação de formas de Fe, Si e, ou, Al na coesão e, ou, cimentação de fragipãs e horizontes coesos em Argissolos e Espodossolos da região dos Tabuleiros Costeiros do sul da Bahia e norte do Espírito Santo. Para isso, foram realizadas extrações seletivas de Fe, Si e Al por ditionito-citrato-bicarbonato de sódio (DCB) e oxalato ácido de amônio. Os maiores teores de Fe, Si e,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Formação Barreiras; Dissolução seletiva; Goethita; Hematita. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000400940 |
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| Camêlo,Danilo de Lima; Ker,João Carlos; Fontes,Maurício Paulo Ferreira; Corrêa,Marcelo Metri; Costa,Antonio Carlos Saraiva da; Melo,Vander Freitas. |
| ABSTRACT Despite the considerable amount of information on the mineralogical characteristics of pedogenic Fe oxides in Brazilian soils, there are few studies on Fe-rich soils developed from mafic rocks with taxonomic identities at lower categorical levels. This study evaluated the mineralogical characteristics of pedogenic Fe oxides in B horizons (Bw) of Fe-rich Oxisols developed from several mafic rocks in the state of Minas Gerais, Brazil. The Bw horizons were sampled at a 0.8-1.0 m depth in 13 Ferric and Perferric Rhodic Oxisols along with a Mesoferric Typic Oxisol originating from basalt, gabbro, tuffite, amphibolite and itabirite in Minas Gerais. The selected soils have taxonomic identities up to the fourth categorical level of the Brazilian System of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hematite; Maghemite; Crystallographic characteristics; Al-substitution; Selective dissolution. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100413 |
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| 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. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferralsols; Cambisols; Mafic rocks; Ultramafics; Perovskite; Tropical soils. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100307 |
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| Camêlo,Danilo de Lima; Ker,João Carlos; Novais,Roberto Ferreira; Corrêa,Marcelo Metri; Lima,Vinício Coelho de. |
| In general, Latosols have low levels of available P, however, the influence of the parent material seems to be decisive in defining the pool and predominant form of P in these soils. This study evaluated P availability by extraction with Mehlich-1 (M-1) and Ion Exchange Resin (IER), from samples of B horizons of Ferric and Perferric Latosols developed from different parent materials. To this end, in addition to the physical and chemical characterization of soils, 10 sequential extractions were performed with M-1 and IER from samples of B horizons (depth between 0.8 and 1.0 m). Total contents of Ca, P, Fe, Al, and Ti were determined after digestion with nitric, hydrofluoric and perchloric acids. The effects of sequential P extractions on Fe oxides were also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Labile phosphorus; Iron oxyhydroxides; Tuffite; Mafic rocks; Total digestion. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401058 |
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| Silva Filho,Luiz Aníbal; Ker,João Carlos; Fontes,Maurício Paulo Ferreira; Camêlo,Danilo de Lima; Corrêa,Marcelo Metri; Cavalcante,Luis Carlos Duarte; Guimarães,Luciano de Moura. |
| ABSTRACT Ferrimagnetic Fe-oxides are important soil components, which are present in most of the agricultural soils of Brazil. Distinction, origin, and assessment of the influence of these minerals on magnetism and geochemistry is a challenge for mineralogists. This study aimed to characterize mineralogically Fe-rich Rhodic Oxisols ( Latossolos Vermelhos ) originating from several mafic rocks in Brazil, and assess the implications on their magnetic and geochemical properties. We present results on magnetic measurements, chemical dissolutions, X-ray diffractometry, Rietveld refinement, Raman, and Mössbauer spectroscopies of Fe-rich Rhodic Oxisols originating from several mafic rocks. They show that magnetite is inherited from the parent material, and its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Magnetite; Maghemite; Trace elements; Mafic rocks; Raman spectroscopy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100411 |
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