Clay mineral composition of river sediments in the Amazon Basin

Guyot, Jean‐Loup; Jouanneau, J. M.; Soares, Leonardo Silva; Boaventura, Géraldo Resende; Maillet, N.; Lagane, Christelle

doi:10.1016/j.catena.2007.02.002

Cited by 174 publications

(145 citation statements)

References 21 publications

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“…Thin soils cover the mostly silicic sedimentary rocks in the upper Beni basin, with a clay mineralogy dominated by illite and chlorite (Guyot et al, 2007). Two samples of the Beni close to the Andean piedmont (Be 1 and Be 2) are used here.…”

Section: 1mentioning

confidence: 99%

“…Seasonally flooding of "varzea" soils in the central Amazonian lowlands results in nutrient-richer soils, with major elemental concentrations (e.g. Mn, Mg, Ca, K) being closer to upper crustal abundances when compared to the depleted nonflooded Central Amazon or Shield soils (Konhauser et al, 1994;Guyot et al, 2007). Here, an increasing trend in iron-and manganese oxide and kaolinite contents and a decreasing trend in illite content from near the Andes in the east to central Amazonia in the west has been observed (Guyot et al, 2007) Tessier et al (1979).…”

Section: 1mentioning

confidence: 99%

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The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

et al. 2012

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(2012): The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios. AbstractConcentrations of meteoric 10 Be extracted from detrital Amazon river sediment are strongly particle size-dependent. Such grain size dependency presents a formidable obstacle to routine applications of meteoric cosmogenic 10 Be to basin-wide erosion studies. In this study, we explore means to eliminate these grain size effects in bedload from rivers of the Amazon basin by measuring 10 Be/ 9 Be ratios after selective chemical extraction of reactive authigenic phases. These phases mainly comprise FeMn(hydr)oxides that are the main carriers of 9 Be and 10 Be. We explore the distribution of 10 Be and its stable 9 Be counterpart between these phases and the partitioning of Be into remaining silicate fractions.This extraction procedure was carried out on bedload samples comprising the three main tectonic units of the Amazon basin, namely the Andes, the Guyana and Brazilian Shields, and the central Amazonian lowlands. For all samples, extracted 10 Be concentrations show a strong decrease with increasing particle size, with up to 20 times more 10 Be extracted from the finest analyzed (<30 μm) grain size when compared to the coarsest (90-125 μm) grain size. We attribute this decrease in 10 Be concentrations mostly to subsequent dilution by quartz in coarse bedload. However, when normalized to stable 9 Be concentrations that are also extracted from reactive phases, grain size effects are effectively removed

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Section: 1mentioning

confidence: 99%

Section: 1mentioning

confidence: 99%

The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

et al. 2012

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“…Os argilominerais podem ser usados como indicador de origem, intensidade do intemperismo e maturidade tanto de rochas sedimentes quanto sedimentos marinhos e fluviais recentes (GUYOT et al, 2007). A análise feita por MARTINELLI et al (1993) indicou a presença dos seguintes argilominerais: ilita, caulinita, clorita e esmectita.…”

Section: -Comparação Entre As Fases Do Empreendimentounclassified

“…Influenciando essa diferença de estoque deste elemento químico, o que mostra também a importância dos argilominerais (MARTINELLI, 1993;LYONS et al, 1995;GUYOT et al, 2007).…”

Section: -Comparação Entre As Fases Do Empreendimentounclassified

“…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;. GUYOT et al, 2007;SIQUEIRA, 2013).…”

Section: -Biomagnificação E Bioacumulação De Hg No Rio Madeiraunclassified

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

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The optical properties of river and floodplain waters in the Amazon River Basin: Implications for satellite‐based measurements of suspended particulate matter

et al. 2015

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Satellite images can now be used to assess river sediment discharge, and systematic studies over rivers and lakes are required to support such applications and document the variability of inland water optical properties at the watershed scale. The optical properties of the Amazon Basin waters were analyzed from in situ measurements of the remote sensing reflectance (R rs ) at 279 stations and downwelling diffuse attenuation coefficients (K d ) at 133 stations. Measurements of the apparent optical properties, suspended particulate matter (SPM) contents, and characteristics and colored dissolved organic matter (CDOM) absorption spectra were performed during 16 cruises along the main Amazonian Rivers draining the Andes and for some tributaries. Surface-suspended sediment granulometry and mineralogy showed a stable distribution at the catchment scale, even over large distances and between tributaries. The particle number-size distribution was best described using a segmented distribution with a slope of 2.2 for the fine range (1-15 μm), and the CDOM absorption coefficient at 440 nm varied from 1.8 to 7.9 m À1 . Overall, both R rs and K d were strongly correlated with SPM, although strong CDOM absorption limited the use of the blue spectrum. Reflectance saturation from blue to red was observed at approximately 100 g m À3 , whereas the near-infrared (NIR) wavelength enabled the monitoring of the full SPM range (5-620 g m À3 ). In contrast, K d showed no saturation for SPM from green to NIR, and a linear model was calculated. The use of the reflectance ratio was investigated and shown to improve the suspended sediment concentration retrieval performance.

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Clay mineral composition of river sediments in the Amazon Basin

Cited by 174 publications

References 21 publications

The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

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

The optical properties of river and floodplain waters in the Amazon River Basin: Implications for satellite‐based measurements of suspended particulate matter

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