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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pantanal. Para informações adicionais entre em contato com cpap.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
27/09/2019 |
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Data da última atualização: |
18/11/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
Lo, E. L.; McGLUE, M. M.; SILVA, A.; BERGIER, I.; YEAGER, K. M.; MACEDO, H. DE.; SWALLOMA, M.; ASSINE, M. L. |
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Afiliação: |
Edward L. Lo, University of Kentucky; Michael M. McGlue, University of Kentucky; AGUINALDO SILVA, UFMS; IVAN BERGIER TAVARES DE LIMA, CPAP; KEVIN M. YEAGER, University of Kentucky; HUDSON DE AZEVEDO MACEDO, UEM; MAREDITH SWALLOMA, University of Kentucky; MARIO L. ASSINE, UNESP. |
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Título: |
Fluvio-lacustrine sedimentary processes and landforms on the distal Paraguay fluvial megafan (Brazil). |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Geomorphology, v. 342, p. 163-175, 2019. |
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DOI: |
10.1016/j.geomorph.2019.06.001 |
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Idioma: |
Inglês |
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Conteúdo: |
Tropical fluvio-lacustrine depositional processes along the toe of the Paraguay fluvialmegafanwere investigated with a focus on Lake Uberaba (LU), the largest lake in the Pantanalwetlands. A limnogeological analysis of LUwas conducted using remote sensing imagery, lake water chemistry, sedimentological and radiochemical data from lake floor samples and short cores. Echo-sounding revealed that LU is deepest (Zmax = ~3.5 m) near its southern shoreline and outlet; the lake is hydrologically open throughout the year and is characterized by a dilute Ca+2-Na+-HCO3 − chemistry. Key environmental controls on sedimentation in LU include inflowing transverse and axial rivers and water level changes, which influence the composition, mixing, accumulation, and the organization of facies. Structureless brown sandy silts with relatively low organic carbon (TOCmean = ~1.7 wt %) and low to moderate biogenic silica (BiSimean = ~1.9 wt%) comprise most offshore lake floor sediments, whereas northern lake margin sediments consist of peaty silts and sandy silts whose origins are linked to inflowing Paraguay megafan distributary channels. Sediment core stratigraphy revealed that extant lacustrine deposits are underlain by oxidized clayey silts and sands, suggesting recent subaerial exposure of the basin floor. Sedimentary datasets conclusively suggest that LU is a shallow overfilled lake basin that is strongly influenced as a depositional system by its persistently open hydrology, shoreline channel density, and absence of margin coincident topography. This study provides newinsights on lacustrine landformdevelopment in distal megafan settings, which is important for improving our understanding of fluvial landscapes. MenosTropical fluvio-lacustrine depositional processes along the toe of the Paraguay fluvialmegafanwere investigated with a focus on Lake Uberaba (LU), the largest lake in the Pantanalwetlands. A limnogeological analysis of LUwas conducted using remote sensing imagery, lake water chemistry, sedimentological and radiochemical data from lake floor samples and short cores. Echo-sounding revealed that LU is deepest (Zmax = ~3.5 m) near its southern shoreline and outlet; the lake is hydrologically open throughout the year and is characterized by a dilute Ca+2-Na+-HCO3 − chemistry. Key environmental controls on sedimentation in LU include inflowing transverse and axial rivers and water level changes, which influence the composition, mixing, accumulation, and the organization of facies. Structureless brown sandy silts with relatively low organic carbon (TOCmean = ~1.7 wt %) and low to moderate biogenic silica (BiSimean = ~1.9 wt%) comprise most offshore lake floor sediments, whereas northern lake margin sediments consist of peaty silts and sandy silts whose origins are linked to inflowing Paraguay megafan distributary channels. Sediment core stratigraphy revealed that extant lacustrine deposits are underlain by oxidized clayey silts and sands, suggesting recent subaerial exposure of the basin floor. Sedimentary datasets conclusively suggest that LU is a shallow overfilled lake basin that is strongly influenced as a depositional system by its persistently open hydrology, shoreline ... Mostrar Tudo |
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Palavras-Chave: |
Distributive fluvial system. |
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Thesagro: |
Lago; Sedimento. |
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Thesaurus Nal: |
Fluvial soils; Lakes; Wetlands. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
null
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Registro original: |
Embrapa Pantanal (CPAP) |
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| 1. |  | AZEVEDO, D. T. de; ALMEIDA, A. M.; RODRIGUES, R. da S.; REIS, V. D. A. dos; SILVA, M. X. da. Monitoramento das tecnologias apícolas adotadas nos Assentamentos Rurais Taquaral e Tamarineiro II, Corumbá, MS. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA PANTANAL, 4.; SEMANA DA BIOLOGIA, 9., 2010, Corumbá. Resumos ... Corumbá: Embrapa Pantanal, 2010. p.31. (Embrapa Pantanal. Documentos, 108).| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pantanal. |
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| 2. | | DURAN, F. DA S.; FEIDEN, A.; SILVA, M. X. da; BISPO, W. A.; BORSATO, A. V.; RODRIGUES, A. K. C. Produção de biomassa de adubos verdes no assentamento Paiolzinho, Corumbá, MS. In: SEMINÁRIO DE AGROECOLOGIA DE MATO GROSSO DO SUL, 3.; ENCONTRO DE PRODUTORES AGROECOLÓGICOS DE MS, 2010, Corumbá, MS. Construindo um futuro sustentável: anais. Dourados: Embrapa Agropecuária Oeste; Corumbá: Embrapa Pantanal; Campo Grande: Embrapa Gado de Corte, 2010. 1 CD-Rom. Disponível também em: Cadernos de Agroecologia, V. 5, n.1, 2010.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pantanal. |
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| 3. | | REIS, V. D. A. dos; AZEVEDO, D. T. DE.; ALMEIDA, A. M. DE.; RODRIGUES, R. DA S.; SILVA, M. X. da; ROSA, W. P.; BARROS, M. A. F. DE.; RAMIREZ, R. P.; ROKENBACH, A.; SOUZA, N. E. DE.; CONCEIÇÃO, L. DA. Acompanhamento das tecnologias apícolas adotadas em assentamentos rurais de Corumbá, MS. In: SEMINÁRIO DE AGROECOLOGIA DE MATO GROSSO DO SUL, 3.; ENCONTRO DE PRODUTORES AGROECOLÓGICOS DE MS, 2010, Corumbá, MS. Construindo um futuro sustentável: anais. Dourados: Embrapa Agropecuária Oeste; Corumbá: Embrapa Pantanal; Campo Grande: Embrapa Gado de Corte, 2010. 1 CD-Rom. Disponível também em: Cadernos de Agroecologia, V. 5, n.1, 2010.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pantanal. |
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| Registros recuperados : 3 | |
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