Characterisation of river bed and suspended sediments in the Rio Madeira drainage basin (Bolivian Amazonia)

Guyot, Jean‐Loup; Jouanneau, J. M.; Wasson, Jean Gabriel

doi:10.1016/s0895-9811(99)00030-9

Cited by 67 publications

(65 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Madeira basin is one of the most important tributaries to the Amazon River in terms of sediment and water discharge (Guyot, 1993;Guyot et al, 1999). The basin can be subdivided into three major morpho-structural units: The Bolivian segment of the Andes where sediment production is high in steep terrains; the Amazon plain featuring vast flooded, low-relief areas at altitudes < 200 m; and the tectonically inactive Brazilian shield that constitutes old Precambrian rocks.…”

Section: Study Areamentioning

confidence: 99%

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

Wittmann

Blanckenburg

Guyot³

et al. 2009

Earth and Planetary Science Letters

View full text Add to dashboard Cite

The denudation rate signal of the Bolivian Andes as measured by cosmogenic 10 Be in sediment is preserved in the floodplain of adjacent foreland basins even though these basins store the sediment for thousands of years. This conclusion is drawn from comparing published Andean source area denudation rates with new cosmogenic 10 Be data as measured in the floodplains of the large Beni and Mamoré basins. For the entire Beni basin including the sediment producing Andes and the vast flooded plains of the foreland, the cosmogenic nuclide-derived denudation rate is 0.45 ± 0.06 mm/yr, while that of the Mamoré basin is 0.55 ± 0.19 mm/yr. By comparison, the respective Andean source areas erode at averaged rates of 0.37 ± 0.06 mm/yr (upper Beni), and at 0.56 ± 0.09 mm/yr (upper Mamoré). We notice a decrease in variability of denudation rate with increasing spatial scale as small-scale processes are averaged out. Sediment mixing within the floodplain damps scatter of nuclide-derived denudation rates picked up in the source area. On the temporal scale, a remarkable agreement between cosmogenic nuclide-derived rates averaging over a few kiloyears with those from fission track dating averaging over millions of years seems to suggest that cosmogenic nuclide-derived denudation rates capture the long-term erosional characteristics of the mountain belt. The sum of these observations suggests that any sample collected along a river traversing a floodplain will yield the denudation rate of the source area. This finding opens the unique possibility of constraining cosmogenic nuclide-derived paleo-sediment budgets for these large basins as the long-term, spatially-averaged denudation rate signal of the sediment-producing area is preserved in sedimentary archives.

show abstract

Section: Study Areamentioning

confidence: 99%

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

Wittmann

Blanckenburg

Guyot³

et al. 2009

Earth and Planetary Science Letters

View full text Add to dashboard Cite

show abstract

“…Essa variação na sua composição se deve a variação do transporte de sólidos em suspensão, uma diferença aproximada de 10 vezes, como medido em outros estudos como ), MORTATTI et al (1989) e LATRUBESSE et al (2005. O rio Madeira transporta na seca 57 x 10 6 e na cheia 552 x 10 6 por ano (GUYOT et al, 1999;AALTO et al, 2003). A dinâmica dos sólidos em suspensão é de suma importância no entendimento dos processos:…”

Section: Esse Sedimento Transporta O Mercúrio (Windmoller 2007)unclassified

“…Estas variações são parcialmente esclarecidas pelo regime de vazões do período hidrológico cuja dinâmica é iniciada com o degelo das geleiras nos contrafortes andinos da Bolívia e Peru e pelo efeito da geomorfologia da área de estudo, condicionada por uma variabilidade altimétrica das nascentes do Rio Beni (Bolívia) nos Andes a formação do Rio Madeira no Brasil de 6.500 m para 120 m (ROCHE et al, 1989;GUYOT et al, 1999). A diferença de altitude contribui para a dinâmica dos sólidos em suspensão na bacia.…”

Section: Esse Sedimento Transporta O Mercúrio (Windmoller 2007)unclassified

“…O regime hidrológico, responsável pela variação na composição da água, se inicia com o degelo dos Andes (LYONS & BIRD, 1995;GUYOT et al, 1999). A composição dos sólidos em suspensão é determinante na constituição físico-química da água (MORTATTI & PROBST, 1998), os argilominerais que o compõem demonstram sua origem e levam Hg MARTINELLI et al, 1993;.…”

Section: -Biomagnificação E Bioacumulação De Hg No Rio Madeiraunclassified

“…GUYOT et al, 2007;SIQUEIRA, 2013). O sedimento e os sólidos em suspensão são carreados aproximadamente 37 x 10 6 T e 40 x 10 6 T anualmente respectivamente MORTATTI et al, 1989;GUYOT, 1993;GUYOT et al, 1999). Os solos da Amazônia são naturalmente enriquecidos com mercúrio (SAINT-AUBIN et al,1998;FADINI et al, 2001;DÓREA et al, 2003;HACON et al,2008), porém, não é o único fator de contribuição, pois Hg é utilizado no garimpo de ouro (MARTINELLI et al, 1988;LACERDA & SALOMONS, 1992;MALM et al, 1998).…”

Section: -Biomagnificação E Bioacumulação De Hg No Rio Madeiraunclassified

See 2 more Smart Citations

Avaliação da dinâmica do mercúrio (Hg) na Bacia do Rio Madeira nos ambientes lêntico e lótico

Neto¹,

de²

View full text Add to dashboard Cite

Fill characteristics of abandoned channels and resulting stratigraphy of a mobile sand‐bed river floodplain

Schwendel

Aalto

Nicholas

et al. 2018

Fluvial Meanders and Their Sedimentary Products in the Rock Record

View full text Add to dashboard Cite

Characterisation of river bed and suspended sediments in the Rio Madeira drainage basin (Bolivian Amazonia)

Cited by 67 publications

References 9 publications

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

Avaliação da dinâmica do mercúrio (Hg) na Bacia do Rio Madeira nos ambientes lêntico e lótico

Fill characteristics of abandoned channels and resulting stratigraphy of a mobile sand‐bed river floodplain

Contact Info

Product

Resources

About