Consulta: subjectFacets:"Mineralogy"
Registros recuperados: 34
Data/hora: 03/06/2024 11:17:14

Origen y distribución espacial de metales pesados en suelos de Zimapán, Hidalgo.
Provedor de dados: 32
Autores: Duarte Zaragoza, Víctor Manuel.
Se realizó un estudio en los suelos de Zimapán, Hgo, cuyo principal objetivo de este trabajo fue conocer el origen y distribución espacial de metales pesados y diferenciar las aportaciones geogénicas derivadas de la actividad humana; en particular sobre la influencia de los depósitos de residuos de mina. La investigación se desarrolló en dos etapas, en la primera, se analizó el grado de contaminación de los suelos superficiales y se determinó la distribución espacial de los metales, usando un análisis geoestadístico. En la segunda etapa, se calculó la tasa de transporte eólico de los residuos de mina, mediante el uso de los modelos teóricos de Bagnold y Kawamura; además se evaluó la contaminación en función de la profundidad de los sitios más contaminados;...
Palavras-chave: Mineralogía; Dispersión eólica; Sistemas de información geográfica (SIG); Concentración de fondo geológico; Análisis de componentes principales (ACP); Residuos de mina; Mineralogy; Wind dispersion; Geographic information system (GIS); Spatial interpolation; Geological background concentration; Principal component analysis (PCA); Mine waste; Edafología; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/1995

Manual de métodos de análise de solo.
Provedor de dados: 14
Autores: TEIXEIRA, P. C.; DONAGEMMA, G. K.; FONTANA, A.; TEIXEIRA, W. G.
Análises físicas; Análises químicas; Análises da matéria orgânica; Análises mineralógicas; Análises micromorfológicas.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Análise micromorfológica; Análise do solo; Física do solo; Química do solo; Matéria orgânica; Mineralogia; Soil analysis; Soil physics; Soil chemistry; Soil organic matter; Mineralogy; Soil micromorphology.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1085209

Caracterização de ambientes na Chapada dos Veadeiros/Vale do Rio Paraná: contribuição para a classificação brasileira de solos.
Provedor de dados: 14
Autores: CORREIA, J. R.; LOBO-BURLE, M.; CALDERANO, S. B.; SPERA, S. T.; GOMES, I. A.; SANTOS, R. D. dos; CAMPOS, J. E. G.; SILVA JUNIOR, M. C. da; NASCIMENTO, R. de O.; MINELA, G.; REATTO, A.; DUARTE, M. N.
bitstream/CPAC-2009/24674/1/doc_47.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Soil chemicophysical properties.; Cerrado; Classificação do Solo; Física do Solo; Geomorfologia; Geologia; Mineralogia; Perfil do Solo; Química do Solo; Solo; Vegetação.; Geomorphology; Geology; Mineralogical soil types; Mineralogy; Soil profiles; Soil classification; Soil; Vegetation.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559147

Predição da granulometria e mineralogia de latossolos do cerrado utilizando espectroscopia de infravermelho próximo.
Provedor de dados: 14
Autores: VENDRAME, P. R. S.; MARCHAO, R. L.; BRITO, O. R.; MARTINS, E. de S.; BECQUER, T.
bitstream/item/141931/1/bolpd-326.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Granulometry; Savanna.; Granulometria; Mineralogia; Classificação do Solo.; Mineralogy; Soil classification.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1041959

Pesquisas coligadas da IX Reunião Brasileira de Classificação e Correlação de Solos: solos de formações sedimentares em sistemas amazônicos: potencialidades e demandas de pesquisa.
Provedor de dados: 14
Autores: SILVA, L. M. da; ANJOS, L. H. C. dos; LUMBRERAS, J. F.; PEREIRA, M. G.; WADT, P. G. S.
Atributos químicos e granulometria dos solos da IX Reunião Brasileira de Classificação e Correlação de Solos (RCC do Acre): um enfoque pedológico. Mineralogia da fração argila dos solos da IX Reunião Brasileira de Classificação e Correlação de Solos - estado do Acre. Mineralogia das frações areia e silte dos solos da IX RCC. Óxidos de ferro em solos do estado do Acre. Micromorfologia de alguns solos da IX RCC, Acre. Uso de georadar no estudo de solos da IX RCC. Classificação de solos da IX RCC: comparação entre os sistemas SiBCS, WRB e Soil Taxonomy. Formas de alumínio em solos do Acre. Fracionamento granulométrico e oxidável da matéria orgânica em solos sob pastagens no estado do Acre. Granulometria: análise convencional e teste de dispersantes químicos...
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Classificação do Solo; Análise do Solo; Granulometria; Mineralogia; Aptidão Agrícola; Soil classification; Soil analysis; Mineralogy; Land suitability.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1110799

Tecnicas de coleta e preparacao de amostras para micromorfologia com otimizacao do processo de impregnacao.
Provedor de dados: 14
Autores: MARTINS, E. de S.; FERREIRA, A. P. M.; CARVALHO JUNIOR, O. A. de; CARDOSO, F. B. da F.; REATTO, A.
bitstream/CPAC-2009/24859/1/doc_69.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Micromorfologia; Impregnacao; Soil testing; Impregnation; Micromorphology.; Análise do Solo; Mineralogia; Recurso Mineral; Solo.; Mineralogy; Mineral resources; Soil.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567868

Relação entre acidez e características químicas, físicas e mineralógicas de solos sob pastagem na região do cerrado.
Provedor de dados: 14
Autores: VENDRAME, P. R. S.; BRITO, O. R.; GUIMARÃES, M. D. F.; MARTINS, E. D. S.; BECQUER, T.
bitstream/CPAC-2009/26867/1/p2005_56.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Acidez do Solo; Cerrado; Fertilidade do Solo; Mineralogia; Química do Solo.; Mineralogy; Soil fertility; Soil pH.; Soil chemistry.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/562777

Guia de campo da XII Reunião Brasileira de Classificação e Correlação de Solos: RCC de Rondônia.
Provedor de dados: 14
Autores: LUMBRERAS, J. F.; SILVA, L. M. da; ANJOS, L. H. C. dos; OLIVEIRA, V. A. de; WADT, P. G. S.; PEREIRA, M. G.; DELARMELINDA-HONORÉ, E. A.; BURITY, K. T. L.
A XII Reunião Brasileira de Classificação e Correlação de Solos e o resgate histórico das RCCs. Uma breve contextualização sobre a ocupação e colonização do estado de Rondônia. Geologia do estado de Rondônia. Análise integrada das paisagens do estado de Rondônia. Vegetação do estado de Rondônia. Solos da XII Reunião Brasileira de Classificação e Correlação de Solos: RCC de Rondônia. Mineralogia da fração argila dos solos da XII Reunião Brasileira de Classificação e Correlação de Solos - estado de Rondônia. Micromorfologia dos perfis da XII RCC. A susceptibilidade magnética e a condutividade elétrica aparente em amostras de solos da XII Reunião Brasileira de Classificação e Correlação de Solos - RCC de Rondônia. Atributos químicos e granulometria dos solos...
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Classificação do Solo; Gênese do Solo; Geologia; Geomorfologia; Mineralogia; Aptidão Agrícola; Soil classification; Soil formation; Geology; Geomorphology; Mineralogy; Land suitability.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1112765

Revisão de intemperismo de micas.
Provedor de dados: 14
Autores: MARTINS, J. C.; MARTINS, E. de S.; REATTO, A.
ABSTRACT: The micas are rock forming mineral of the phyllosillicates group. The weathering of these minerals is fundamental in the understanding of potassium, silicon and magnesium liberation processes to the soil. the existent studies shown that the main factors that control the micas weathering are the pH of the solutions, the temperature, the size of the particles and the superficial area. The micas weathering is incongruous, in other words, always new minerals are formed as dissolution products, as vermiculite, kaolinite and goethite. These products can precipitate in the surface of the mica, especially the iron oxides of iron, and they impede the contact with its surface, reducing the dissolution kinetics. The structure of the micas is also a decisive...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Dissolução mineral; Intemperismo; Modelo experimental; Mineral dissolution; Experimental models.; Mineralogia; Solo.; Mineralogy; Soil; Weathering.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568958

Capacidade de troca de cátions da fração argila em latossolo amarelo com diferentes texturas, em Paragominas, PA.
Provedor de dados: 14
Autores: SANTOS, P. L. dos; MARTINS, J. S.; VALENTE, M. A.; OLIVEIRA JUNIOR, R. C. de.
bitstream/item/32761/1/CPATU-BP172.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Troca de cations; Ferrasoils.; Latossolo Amarelo; Mineralogia; Química do Solo; Solo Argiloso; Solo.; Clay soils; Cations; Mineralogy; Soil chemistry; Soil.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/374973

Caracterização física e aspectos geoquímicos de dois solos da Península Keller, Ilha Rei George, Antártica Marítima.
Provedor de dados: 14
Autores: ALBUQUERQUE FILHO, M. R.; SCHAEFER, C. E. G. R.; SIMAS, F. B. N.; PEREIRA, V. V.; GUERRA, M. B. B.
bitstream/CPAC-2009/26885/1/p2005_61.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Soil testing.; Análise do Solo; Geoquímica; Mineralogia; Solo.; Geochemistry; Mineralogy; Soil.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569491

A influência da mineralogia na evolução micromorfológica do colapso em saprólito e latossolo.
Provedor de dados: 14
Autores: CARDOSO, F. B. da F.; MARTINS, E. de S.; CARVALHO, J. C. de.
Resumo: Este trabalho mostra a aplicação de técnicas modernas de micromorfologia e mineralogia no desenvolvimento de um modelo evolutivo do colapso em solos tropicais profundamento intemperizados. Abstract: This work exibition the application of modern techniques of micromorphology and mineralogy in the development of an evolutionary model of the collapse in deeply weathering tropical soils.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: ECOSOL170; Micromorfologia; Colapso; Micromorphology; Collapse; Soil testing.; Análise do Solo; Cerrado; Geoquímica; Mineralogia; Solo.; Geochemistry; Mineralogy; Soil.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567945

Variabilidade mineralógica de latossolos na bacia do Rio Jardim, DF (1999).
Provedor de dados: 14
Autores: REATTO, A.; MARTINS, E. de S.; GUIMARÃES, E. M.; SPERA, S. T.; SIMM, K. M. C. de B.; CORREIA, J. R.
A Bacia do rio Jardim constitui a principal sub-bacia do rio Preto, localizada na parte Leste do Distrito Federal. Nessa regiao e produzido a maior parte de graos, hortalicas, frutas, gado de corte, frango e leite. Os Latossolos compoem aproximadamente 65% das terras, representando a classe de solo de maior importancia agricola. O objetivo deste trabalho foi avaliar a variabilidade mineralogica de Latossolos dessa Bacia. As amostras dos Latossolos foram coletadas em sete perfis, durante o Levantamento Semidetalhado da Bacia do rio Jardim, realizado pela Equipe de Pedologia da Embrapa Cerrados. Essas foram submetidas a caracterizacao fisica (analise granulometrica); quimica (ataque sulfurico) e mineralogica (sseparacao das fracoes com NaOH),...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Rio Jardim; Distrito Federal; Brasil.; Cerrado; Latossolo; Mineralogia; Solo.; Ferralsols; Brazil; Mineralogy; Soil.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555309

Método integrado de caracterização mineralógica de solos profundamente intemperizados.
Provedor de dados: 14
Autores: MARTINS, E. de S.
bitstream/CPAC-2009/20308/1/comtec_37.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Intemperismo; Metodologia; Methods.; Cerrado; Mineralogia; Solo.; Mineralogy; Soil; Weathering.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/558084

Reconstitution de la variabilité naturelle climatique et océanographique dans l’estuaire et le golfe du Saint-Laurent au cours des 10,000 dernières années
Provedor de dados: 5
Autores: Casse, Marie.
L’estuaire et le golfe du Saint-Laurent (EGSL, Est du Canada) sont des milieux très dynamiques d’un point de vue sédimentaire. Pourtant, les voies de propagation des sédiments fluviaux ainsi que l’origine et le mélange des apports sédimentaires en milieu marin ne sont pas bien documentés dans cette zone. Or, ces connaissances sont fondamentales pour déterminer les sources principales des apports terrigènes et mieux comprendre la dynamique de ce système sédimentaire. Dans ce contexte, les propriétés physiques, la distribution granulométrique, la minéralogie, les éléments majeurs et traces, et les isotopes radiogéniques (néodyme et strontium) d’un ensemble de sédiments de surface et de carottes sédimentaires de l’EGSL ont été étudiées dans cette thèse afin...
Tipo: Text
Palavras-chave: Estuary and gulf of St.Lawrence; Holocene; Laurentide Ice Sheet; Relative sea level; Sedimentary dynamic; Mineralogy; Geochemistry; Radiogenic isotopes; Rare earth elements.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00494/60611/64095.pdf

Nickel isotope fractionation during tropical weathering of ultramafic rocks
Provedor de dados: 5
Autores: Ratie, G.; Jouvin, D.; Garnier, Julien; Rouxel, Olivier; Miska, S.; Guimaraes, E.; Cruz Vieira, L.; Sivry, Y.; Zelano, I.; Montarges-pelletier, E.; Thil, F.; Quantin, C.
Although Ni isotopes have been shown to be significantly fractionated in terrestrial samples, their use in continental environmental studies has not yet been evaluated. The present study focuses on an ultramafic (UM) massif (Barro Alto, Goias, Brazil) because such areas are naturally rich in Ni. We present developed lateritic weathering profiles. The goal of the study is to evaluate the potential of using Ni isotopes in environmental continental studies by combining its isotopic signature with mineralogy, in order to better understand the geochemical cycling of Ni in UM settings during weathering. As such, Ni isotope values were measured in samples from the Barro Alto UM complex in the main stages of the lateritic weathering profile of UM rocks, including...
Tipo: Text
Palavras-chave: Nickel; Isotope; Weathering; Mineralogy; Soil.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00254/36553/35098.pdf

Variabilité et origine des apports détritiques dans le secteur indien de l'océan Austral au cours des derniers 30 000 ans
Provedor de dados: 5
Autores: Manthe, Sandrine; Bareille, Gilles; Salvignac, Marie-eve; Labracherie, Monique; Lemoine, Flavien; Labeyrie, Laurent.
The surface water circulation variability in the southeastern Indian Sector has been investigated using micropalaeontological and isotopic analysis in a deep-sea core located near the Subantarctic Front. The frequency and intensity of iceberg and meltwater discharges have been studied by counting detrital grains &gt;45 mu m, by determining their mineralogical composition, and by measuring delta(18)O in the planktonic foraminifera Neogloboquadrina pachyderma sinistral. The variability of hydrologic fronts was determined by estimating the sea surface temperatures (SST) using the Imbrie and Kipp foraminifera transfer function. Four iceberg discharge events were determined between 24 and 12 ka C-14 BP during the last glacial stage. Distinct but low magnitude...
Tipo: Text
Palavras-chave: Océan Austral; Particules détritiques; Minéralogie; Icebergs; Southern Ocean; Ice-rafted-detritus; Mineralogy; Icebergs.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00220/33162/31670.pdf

Bohemian mineralogy in the early 19th century: the Vaterländisches Museum in Böhmen
Provedor de dados: 16
Autores: Schweizer, C.R.
The Vaterländisches Museum in Prague was officially founded in 1822 by Caspar and Franz Sternberg as a manifestation of Bohemian nationalism. It aimed at 1) the education of the public, 2) the sponsorship of Bohemian scientific and cultural research, and 3) the economical utilization of scientific knowledge. Under these aspects also the development of the oryctognostic collection of the museum should be regarded.   In 1818, private mineral collections were donated. After its official opening in 1822, the united collections were split into two parts, a systematic and a local native collection. The first was basically distinguished by a prominent sortiment of gems, particularly by the typical garnet species and varieties, furthermore by the meteorites of...
Tipo: Article / Letter to the editor
Palavras-chave: 19th century; Bohemia; Museum; Collections; Research; Mineralogy; 38.30.
Ano: 2004
URL: http://www.repository.naturalis.nl/record/215469

Estudio sedimentológico y mineralógico en Bahía Chile, Isla Greenwich, Islas Shetland del Sur (Antártida)
Provedor de dados: 20
Autores: Villacrés, J.; Goyes A., P.
En este trabajo se presentan los resultados de los análisis realizados sobre los sedimentos superficiales de fondo en Bahía Chile, Isla Greenwich, desde el punto de vista granulométrico y mineralógico. En un total de 18 muestras del área se observa una predominancia de limos muy mal seleccionados, platicúrticos y con asimetría hacia los tamaños finos. Mineralógicamente, se observa mayor concentración de minerales livianos sobre los pesados, con altos porcentajes de fragmentos de rocas igneas, deduciéndose que son sedimentos inmaduros y que el área fuente se encuentra en una zona cercana. Los sedimentos depositados en la bahía son de orígen mixto: Procedentes de la erosión de las formaciones costeras y en menor porcentaje, del aporte de organismos marinos....
Tipo: Journal Contribution
Palavras-chave: Granulometry; Mineralogy; Sediment mixing; Heavy minerals; Igneous rocks; Light minerals; Mineralogy.
Ano: 1993
URL: http://hdl.handle.net/1834/3770

Répartition granulométriques et minéralogiques des sédiments de surface dans le Golfe de Tunis
Provedor de dados: 20
Autores: Chkioua, A.; BRAHIM, M.
Les résultats des analyses granulométriques et minéralogiques des sédiments de surface du golfe de Tunis, prélevés à différentes profondeurs entre Sidi El Mekki et le Cap Bon, ont permis d’identifier l’origine de ces sédiments et de préciser les modes de transport et de dépôt. L’étude  granulométrique a montré que les matériaux détritiques dans le golfe de Tunis sont d’origine continentale. L’étude minéralogique a permit de mettre en évidence une nette relation entre le stock sédimentaire récent du golfe de Tunis et les formations géologiques bordières. La répartition des sédiments grossiers et fins dans le golfe de Tunis est contrôlée par les courants généraux de la méditerranée.  Le passage des courants généraux dans le golfe conditionne la présence...
Tipo: Journal Contribution
Palavras-chave: Dynamics; Grain size; Granulometry; Mineralogy; Sediment analysis; Sediment distribution.
Ano: 2007
URL: http://hdl.handle.net/1834/4254

Impact des émissaires et canalisation sur l'environnement de la baie de Tanger ( Maroc ) : Approche géochimique
Provedor de dados: 20
Autores: Achab, M.; El hatimi, I.; El moumni, B.
Dans le but d’évaluer le degré de contamination chimique et/ou organique des sédiments superficiels le long des émissaires continentaux, des échantillons de sédiments de surface ont été prélevés et analysés le long des oueds Souani et Mghogha et au niveau de la canalisation majeure de la ville de Tanger débouchant sur la baie située sur la marge méditerranéenne marocaine. La dynamique sédimentaire dans les oueds montre exceptionnellement une évolution amont–aval granocroissante en relation avec l’activité anthropique (remblaiement des bassins versants par les matériaux de construction tels que les briques, ciments, verres, etc.). La matière organique est présente à des teneurs relativement élevées en corrélation positive avec la sédimentation fine. L’azote...
Tipo: Journal Contribution
Palavras-chave: Sedimentology; Mineralogy; Pollution; Geochemical surveys; Bay dynamics.
Ano: 2002
URL: http://hdl.handle.net/1834/199

Essai d'interprétation de la dynamique sédimentaire par l'analyse granulométrique et minéralogique au large du golfe de Gabès
Provedor de dados: 20
Autores: Brahim, M.; Ben Amor, R.; Gueddari, M.
The results of the grain size and mineralogical analysis of the surface sediments of the Gulf of Gabes, taken with Various depths between the coast Sfax-Zarzis and the isobaths -100 m, allow to identify the origin of these sediments and to specify the factors and the phenomena, which are involved in their transport and their deposit. The mineralogical study resulted in high lighting a clear relation between the recent sedimentary stock of the gulf of Gabès and the bordering geological formations. The sediments study showed that the detritus materials are of continental origin and the sediments coming from the coastal erosion are subjected to a dynamics, which is controlled, primarily by the action of the currents (current coastal and currents tide and by...
Tipo: Journal Contribution
Palavras-chave: Grain size; Sediment analysis; Sediment chemistry; Sediments; Mineralogy.
Ano: 2003
URL: http://hdl.handle.net/1834/1118

Estudio sedimentológico y mineralógico de la plataforma continental ecuatoriana en el tramo comprendido  entre Salinas y Ayampe
Provedor de dados: 20
Autores: Soledispa, B.; Villacres, J.
Esta investigación tiene como principal objetivo conocer como están distribuidos los sedimentos en el área, su origen, procedencia y su comportamiento en relación a los agentes de transporte y sedimentación que allí actúan.
Tipo: Journal Contribution
Palavras-chave: Sedimentology; Mineralogy; Distribution; Sediment analysis; Mineralogy; Distribution; Http://aims.fao.org/aos/agrovoc/c_4856; Http://aims.fao.org/aos/agrovoc/c_35773.
Ano: 1989
URL: http://hdl.handle.net/1834/2158

INTERNAL STRUCTURE OF A VERMICULAR IRONSTONE AS DETERMINED BY X-RAY COMPUTED TOMOGRAPHY SCANNING
Provedor de dados: 90
Autores: Zinn,Yuri Lopes; Carducci,Carla Eloize; Araujo,Marla Alessandra.
Ironstones or petroplinthites are common materials in soils under humid tropical climate, generally defined as the result of Fe oxide accumulation in areas where the water table oscillates, and may exhibit considerable morphological variability. The aim of this study was to examine the internal structure and porosity of an ironstone fragment from a Petroferric Acrudox in Minas Gerais, Brazil, by computed tomography (CT) and conventional techniques. The sample analyzed had total porosity of 59.5 %, with large macropores in the form of tubular channels and irregular vughs, the latter with variable degrees of infilling by material released from the ironstone walls or the soil matrix. The CT scan also showed that the ironstone has wide variation in the density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laterite; Soils with plinthite; Density; Mineralogy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200345

Estimation of water retention and availability in soils of Rio Grande do Sul
Provedor de dados: 90
Autores: Reichert,José Miguel; Albuquerque,Jackson Adriano; Kaiser,Douglas Rodrigo; Reinert,Dalvan José; Urach,Felipe Lavarda; Carlesso,Reimar.
Dispersed information on water retention and availability in soils may be compiled in databases to generate pedotransfer functions. The objectives of this study were: to generate pedotransfer functions to estimate soil water retention based on easily measurable soil properties; to evaluate the efficiency of existing pedotransfer functions for different geographical regions for the estimation of water retention in soils of Rio Grande do Sul (RS); and to estimate plant-available water capacity based on soil particle-size distribution. Two databases were set up for soil properties, including water retention: one based on literature data (725 entries) and the other with soil data from an irrigation scheduling and management system (239 entries). From the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedotransfer functions; Texture class; Water retention curve; Mineralogy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600004

Contribution of non-exchangeable potassium forms and its accumulation in corn plants
Provedor de dados: 91
Autores: Vieira,Montesquieu da S.; Oliveira,Fábio H. T. de; Santos,Hemmannuella C.; Medeiros,Jailma dos S. de.
ABSTRACT The state of Paraíba, Brazil, has soils from well- to poorly-developed, in which potassium (K) is found in different levels, forms and, consequently, with varying availability to plants. The objective of this study was to evaluate the contribution of non-exchangeable K forms to corn plants in 12 soils from Paraíba state, along four successive cycles. The experimental design was completely randomized block with three replicates and the 24 treatments consisted of the combination between two K levels (0 and 100 mg dm-3) ​​and 12 soils. Before and after each cycle, subsamples of 0.2 dm3 were collected in each pot for the determination of non-exchangeable K (Kne), exchangeable K (Ke) and soluble K (Ks). For each cycle, dry matter production, dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeastern soils; Mineralogy; K forms; K availability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100009

Modeling boron adsorption on five soils before and after removal of organic matter
Provedor de dados: 63
Autores: Santos,Patricia dos; Goldberg,Sabine; Costa,Antonio Carlos Saraiva da.
ABSTRACT Boron- B concentrations that cause deficiency and those that cause toxicity appear to be very similar, compared to other nutrients, which can complicate successful management of this element in soils. In this study, B adsorption onto two Oxisols from Brazil (Rhodic Eutroperox and Anionic Acroperox), two Alfisols (Natric Palexeralf and Aridic Paleustalf) and an Entisol (Xeric Torrifluvent) from the United States of America were evaluated. The samples were treated with sodium hypochlorite in order to remove soil organic matter. Both treated and untreated samples were used to determine B adsorption isotherms using different B concentrations (0-4.630 mmol L–1) and NaNO3 (0.05 M) as background electrolyte solution at pH 7. Boron adsorption envelopes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FITEQL; Chemical properties; Mineralogy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401401

Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems
Provedor de dados: 63
Autores: Reis,Cecília Estima Sacramento dos; Dick,Deborah Pinheiro; Caldas,Jennifer da Silva; Bayer,Cimélio.
The capacity of soils to sequestrate carbon (C) is mainly related to the formation of organo-mineral complexes. In this study, we investigated the influence of soil management systems on the C retention capacity of soil with an emphasis on the silt and clay fractions of two subtropical soils with different mineralogy and climate. Samples from a Humic Hapludox and a Rhodic Hapludox, clayey soils cultivated for approximately 30 years under no-tillage (NT) and conventional tillage (CT) were collected from six layers distributed within 100-cm soil depth from each site and from an adjacent native forest. After the removal of particulate organic matter (POM), the suspension (&lt;53 µm) was sonicated, the silt and clay fractions were separated in accordance with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon saturation; Mineralogy; Physical fractionation; Soil organic matter; Soil profile.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400006

Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry
Provedor de dados: 36
Autores: Guimarães,José Tasso Felix; Cohen,Marcelo Cancela Lisboa; França,Marlon Carlos; Silva,Any Kelly Terra da; Rodrigues,Suyanne Flavia Santos.
Based on sedimentological and geochemical data, this work relates spectrophotometric measurements with sediment composition and its application in palaeoecological studies of Amazon wetlands. The CIELAB values are directly related to mineralogical and chemical composition, mostly involving quartz, iron oxyhydroxides and sulfides (e.g. pyrite), and total organic carbon. Total organic carbon contents between 0.4-1%, 1-2%, 3-5% and 15-40% were related to L* (lightness) data of 27, 26-15, 7-10 and 7 or less, respectively. The CIELAB values of a deposit in Marabá, Pará, were proportional to variations in quartz and total organic carbon contents, but changes in zones of similar color, mainly in the +a* (red) and +b* (yellow) values of deposits in Calçoene, Amapá...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentology; Amazon region; Munsell color systems; Mineralogy; Chemical composition.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000300009

The ceramic artifacts in archaeological black earth (terra preta) from lower Amazon region, Brazil: mineralogy
Provedor de dados: 36
Autores: Costa,Marcondes Lima da; Kern,Dirse Clara; Pinto,Alice Helena Eleotério; Souza,Jorge Raimundo da Trindade.
Several archaeological black earth (ABE) sites occur in the Amazon region. They contain fragments of ceramic artifacts, which are very important for the archaeological purpose. In order to improve the archaeological study in the region we carried out a detailed mineralogical and chemical study of the fragments of ceramic artifacts found in the two ABE sites of Cachoeira-Porteira, in the Lower Amazon Region. Their ceramics comprise the following tempers: cauixi, cariapé, sand, sand +feldspars, crushed ceramic and so on and are composed of quartz, clay equivalent material (mainly burned kaolinite), feldspars, hematite, goethite, maghemite, phosphates, anatase, and minerals of Mn and Ba. Cauixi and cariapé, siliceous organic compounds, were found too. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Terra Preta; Black Earth; Archaeological ceramic fragment; Lower Amazon; Phosphates; Mineralogy.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000200004

Petrology of Gameleira potassic lamprophyres, São Francisco Craton
Provedor de dados: 42
Autores: Plá Cid,Jorge; Campos,Cristiani S.; Nardi,Lauro V.S.; Florisbal,Luana.
Gameleira lamprophyres are dykes and mafic microgranular enclaves associated with the shoshonitic Gameleira monzonite. This association belongs to the Paleoproterozoic alkaline magmatism from Serrinha nucleus, northeast Brazil. The liquidus paragenesis is diopside, pargasite, apatite and mica. Reverse zoning was identified in the groundmass alkali feldspar and was related to the undercooling of lamprophyric magma during the emplacement, with high growth rate of pargasite/edenite inducing disequilibrium between feldspars and liquid. Chemical data indicate that the lamprophyres are basic rocks (SiO2 &lt; 48 wt%), with alkaline character (Na2O + K2O &amp;gt; 3 wt%) and potassic signature (K2O/Na2O ≈ 2). High contents of MgO and Cr are consistent with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potassic lamprophyres; Gameleira lamprophyres; São Francisco Craton; Mantle metasomatism; Petrology; Mineralogy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200010

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province
Provedor de dados: 42
Autores: VILALVA,FREDERICO C.J.; VLACH,SILVIO R.F.
The Morro Redondo Complex is one of the most important occurrences of the Graciosa A-type Province, southern Brazil. It consists of the Papanduva and Quiriri granitic plutons and a contemporaneous bimodal volcanic association. The Papanduva Pluton includes massive and deformed peralkaline alkali-feldspar granites with Na-Ca and Na-amphiboles and clinopyroxenes. The deformed types are the most evolved rocks in the province and carry rare ‘agpaitic’ minerals, some being described for the first time in granites from Brazil. The larger Quiriri Pluton comprises massive, slightly peraluminous, biotite syeno- and monzogranites with rare Ca-amphibole. Biotite compositions are relatively homogeneous, whereas sodic amphiboles and clinopyroxenes show increasing Na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: A-type granites; Geochemistry; Petrography; Graciosa Province; Mineralogy; Morro Redondo Complex.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100085

Physical attributes of kaolinitic and oxidic oxisols resulting from different usage systems
Provedor de dados: 52
Autores: Centurion,José Frederico; Beutler,Amauri Nelson; Souza,Zigomar Menezes de.
The objective of this study was to assess the physical attributes of a kaolinitic oxisol, medium texture (Haplustox) and an oxidic oxisol, clayey (Eutrustox) under different usage systems, localized in the region of Jaboticabal, SP, Brazil. The usage systems were sugarcane, cotton and forest. Parameters such as soil bulk density, total porosity, macro and microporosity at the depths of 0.0-0.1; 0.1-0.2; 0.2-0.3, and 0.3-0.4 m were evaluated. Haplustox showed greater bulk density and smaller total porosity, macro and microporosity. The usage increased the bulk density in 0.0-0.3 m depth, with greater effects on the kaolinitic oxisol, mainly in 0.1-0.2 m depth in the areas cultivated with sugarcane.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Cotton; Forest; Mineralogy; Porosity; Bulk density.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500007

Pedogenic iron oxides in soils of the Acre State, Brazil
Provedor de dados: 65
Autores: Inda,Alberto Vasconcellos; Fink,Jessé Rodrigo; Santos,Tatiele Fruett dos.
ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineralogy; X ray diffraction; Hematite; Goethite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000800251