Mid- and late-Holocene sedimentary process and palaeovegetation changes near the mouth of the Amazon River

Guimarães, José Tasso Felix; Cohen, Marcelo Cancela Lisboa; Pessenda, Luiz Carlos Ruiz; França, Marlon Carlos; Smith, Clarisse Beltrão; Nogueira, Afonso César Rodrigues

doi:10.1177/0959683611423693

Cited by 46 publications

(36 citation statements)

References 72 publications

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“…Several studies have presented coastal environmental shifts in response to Holocene sea-level changes (Behling et al, 2001(Behling et al, , 2004Blasco et al, 1996;Cohen et al, 2005aCohen et al, ,b, 2012Ellison, 2005;Engelhart et al, 2007;Fujimoto et al, 1996;Guimarães et al, 2012Guimarães et al, , 2013Horton et al, 2005;Monacci et al, 2009Monacci et al, , 2011Parkinson et al, 1994;Smith et al, 2012;Woodroffe, 1981;Yulianto et al, 2004Yulianto et al, , 2005. The effect of relative sea-level (RSL) changes is apparent in coastal environments, where significant geomorphological changes (Giannini et al, 2007) extend to the mangrove dynamics (Behling et al, 2001(Behling et al, , 2004Cohen and Lara, 2003;Cohen et al, 2004Cohen et al, , 2005aFrança et al, 2012;Guimarães et al, 2012;Lara et al, 2002;Vedel et al, 2006).…”

Section: Introductionmentioning

confidence: 95%

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

França

Cohen

Pessenda³

et al. 2013

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Section: Introductionmentioning

confidence: 95%

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

França

Cohen

Pessenda³

et al. 2013

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“…The major and trace element composition is very similar to that in French Guiana and Bragança, Pará, mangroves, which are relatively enriched in Fe 2 O 3 and immobile elements Sc, Zr, Nb and Cr in relation to Upper Continental Crust and Post-Archean Australian Shales (Table 3). The presence of albite and muscovite also indicates some contribution of Precambrian crystalline rocks from the Guianas Shield found near the coastal plain of the State of Amapá (Guimarães et al 2012).…”

Section: Bioturbated Sand (Sb)mentioning

confidence: 88%

“…The Amapá site presents extensive Holocene tidal flats, influenced by a semi-diurnal macrotidal regime (5-6 m amplitude) and the Amazon River's discharge (Meade et al 1985;Gallo and Vinzon 2005), and is mainly colonized by herbaceous vegetation (Guimarães et al 2010, Figure 1B). The herbaceous plain sampled is only flooded by a water column of 10 cm during overbank flow at higher spring tides of the rainy season (supratidal), and is characterized by an elevation between approximately 2 and 4 m and low drainage density due to the siltation of the tidal channels (Guimarães et al 2012). The climate is Tropical/megathermal, characterized by a total annual precipitation of 3,000 mm, mostly concentrated in January to July and average temperature around 27.5 ºC (Bezerra et al 1990).…”

Section: Study Areamentioning

confidence: 99%

Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry

et al. 2013

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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 and Soure, Pará, indicate a close relationship between total organic carbon content and iron oxyhydroxides and sulfides. Furthermore, the Q7/4 diagram (ratio between the % reflectance value at 700 nm to that at 400 nm, coupled with L*) indicated iron-rich sediments in the bioturbated mud facies of the Amapá deposit, bioturbated mud and bioturbated sand facies of Soure deposit, and cross-laminated sand and massive sand facies of the Marabá core. Also, organicrich sediments were found in the bioturbated mud facies of the Amapá deposit, lenticular heterolithic and bioturbated mud facies of the Soure deposit, and laminated mud and peat facies of the Marabá deposit. At the Marabá site, the data suggest an autochthonous influence with peat formation. The coastal wetland sites at Marajó and Amapá represent the development of a typical tidal flat setting with sulfide and iron oxyhydroxides formation during alternated flooding and drying. KEYWORDS: Sedimentology, Amazon region, Munsell color systems, Mineralogy, chemical composition.Influências mineralógicas e geoquímicas na cor dos sedimentos das zonas úmidas da Amazônia analisada através da espectrofotometria no visível RESUMO Com base em dados sedimentológicos e geoquímicos, este trabalho relaciona medições espectrofotométricas com a composição do sedimento, e sua aplicação em estudos paleoecológicos das áreas alagáveis da Amazônia. Os dados CIELAB estão diretamente relacionados à composição mineralógica e química dos sedimentos, especialmente quartzo, oxihidróxidos e sulfetos de ferro, e carbono orgânico total. Conteúdos de carbono orgânico total entre 0,4-1%, 1-2%, 3-5% e 15-40% foram relacionados a dados de L* (luminosidade) de 27, 26-15, 7-10 e 7 ou menos, respectivamente. Os valores CIELAB de um depósito com turfa em Marabá, Pará, foram proporcionais a variações no conteúdo de quartzo e carbono orgânico total, mas mudanças nas zonas de cores similares, principalmente nos valores de +a* (vermelho) e +b* (amarelo), ao longo de outros depósitos em Calçoene, Amapá e Soure, Pará, indicam uma relação muito próxima entre os conteúdos de carbono orgânico total, oxihidróxidos e sulfetos de ferro. Além disso, o diagrama Q7/4 (razão entre valores percentuais de refletância em 700 nm e 400 nm, juntamente com dados ...

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“…After this period, Holocene sands and muds from the Amazon River were deposited, forming the modern tidal flats of the ACP (Fig. 9 -stage 6; Guimarães et al 2012Guimarães et al , 2013b. …”

Section: Paleoenvironment Evolution Of the Itaubal Formationmentioning

confidence: 99%

“…9 -stage 1), occurred before 120,000 years BP (Tatumi et al 2008;Rosseti and Valeriano 2007). Wong et al 2009;Guimarães et al 2012 …”

Section: Correlation With Pleistocene Units Of Northern South Americamentioning

confidence: 99%

Late Pleistocene sea-level changes recorded in tidal and fluvial deposits from Itaubal Formation, onshore portion of the Foz do Amazonas Basin, Brazil

et al. 2015

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The Pleistocene deposits exposed in the Amapá Coastal Plain (onshore portion of the Foz do Amazonas Basin, northeastern South America) were previously interpreted as Miocene in age. In this work, they were named as "Itaubal Formation" and were included in the quaternary coastal history of Amazonia. The study, through facies and stratigraphic analyses in combination with optically stimulated luminescence (single and multiple aliquot regeneration), allowed interpreting this unit as Late Pleistocene tidal and fluvial deposits. The Itaubal Formation, which unconformably overlies strongly weathered basement rocks of the Guianas Shield, was subdivided into two progradational units, separated by an unconformity related to sea-level fall, here named as Lower and Upper Units. The Lower Unit yielded ages between 120,600 (± 12,000) and 70,850 (± 6,700) years BP and consists of subtidal flat, tide-influenced meandering stream and floodplain deposits, during highstand conditions. The Upper Unit spans between 69,150 (± 7,200) and 58,150 (± 6,800) years BP and is characterized by braided fluvial deposits incised in the Lower Unit, related to base-level fall; lowstand conditions remained until 23,500 (± 3,000) years BP. The studied region was likely exposed during the Last Glacial Maximum and then during Holocene, covered by tidal deposits influenced by the Amazon River.

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Mid- and late-Holocene sedimentary process and palaeovegetation changes near the mouth of the Amazon River

Cited by 46 publications

References 72 publications

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

Mangrove vegetation changes on Holocene terraces of the Doce River, southeastern Brazil

Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry

Late Pleistocene sea-level changes recorded in tidal and fluvial deposits from Itaubal Formation, onshore portion of the Foz do Amazonas Basin, Brazil

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