Bertassoli Junior, Dailson José; Sawakuchi, André Oliveira; Sawakuchi, Henrique O; Pupim, Fabiano Nascimento; Hartmann, Gelvam André; McGlue, Michael M; Chiessi, Cristiano Mazur; Zabel, Matthias; Schefuß, Enno; Pereira, Tatiana S; Faustino, Samantha B; Oliveira, Paulo Eugenio; Bicudo, Denise C (2018): Geochemical data and luminescence ages from riverbed, downcore, and suspended sediment samples from the Xingu, Tapajós and Amazon Rivers [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.893251, Supplement to: Bertassoli Junior, Dailson José; Sawakuchi, André Oliveira; Sawakuchi, Henrique O; Pupim, Fabiano Nascimento; Hartmann, Gelvam André; McGlue, Michael M; Chiessi, Cristiano Mazur; Zabel, Matthias; Schefuß, Enno; Pereira, Tatiana S; Santos, Rudney A; Faustino, Samantha B; Oliveira, Paulo Eugenio; Bicudo, Denise C (2017): The fate of carbon in sediments of the Xingu and Tapajós Clearwater Rivers, Eastern Amazon. Frontiers in Marine Science, 4, https://doi.org/10.3389/fmars.2017.00044
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Abstract:
In this study, we analyzed the organic and inorganic geochemistry and magnetic susceptibility of sediments (suspended, riverbed, and downcore) from the Amazon, Xingu, and Tapajós Rivers to investigate the effects of hydrologic variations on the carbon budget of amazonian clearwater rivers over the Holocene. Ages of sediment deposition (∼100 to 5,500 years) were constrained by optically stimulated luminescence. Major elements concentrations were measured using an inductively coupled plasma-optical emission spectrometer (ICP-OES) for suspended sediments and an energy dispersive x-ray fluorescence (XRF) spectrometer for riverbed and downcore sediment samples. TOC values in sediment cores are similar to values measured in riverbed sediments and indicate suitable conditions for organic matter preservation in sediments of the Xingu and Tapajós rias at least since the mid-Holocene, with carbon burial rates varying from about 84g m−2 yr−1 to 169 g m−2 yr−1. Redox-sensitive elements in the sediment core indicate alternation between anoxic/dysoxic and oxic conditions in the water-sediment interface that may be linked to abrupt changes in precipitation. Changes promoted by hydrological variations significantly affect the capacity of amazonian rias to act either as sources or sinks of carbon.
Coverage:
Median Latitude: -2.457531 * Median Longitude: -52.436918 * South-bound Latitude: -3.885000 * West-bound Longitude: -55.511000 * North-bound Latitude: -1.444000 * East-bound Longitude: -51.691000
Date/Time Start: 2011-09-01T00:00:00 * Date/Time End: 2014-11-01T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
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Datasets listed in this publication series
- Bertassoli Junior, DJ; Sawakuchi, AO; Sawakuchi, HO et al. (2018): Major element concentration in riverbed sediment samples from the Xingu, Tapajós and Amazon Rivers, Brazil. https://doi.org/10.1594/PANGAEA.893252
- Bertassoli Junior, DJ; Sawakuchi, AO; Sawakuchi, HO et al. (2018): Major element concentration in suspended sediment samples from the Xingu, Tapajós and Amazon Rivers, Brazil. https://doi.org/10.1594/PANGAEA.893249
- Bertassoli Junior, DJ; Sawakuchi, AO; Sawakuchi, HO et al. (2018): Luminescence ages from sediment core XC05 from the Xingu River, Brazil. https://doi.org/10.1594/PANGAEA.893248
- Bertassoli Junior, DJ; Sawakuchi, AO; Sawakuchi, HO et al. (2018): Major element concentration of sediment core XC05 from the Xingu River, Brazil. https://doi.org/10.1594/PANGAEA.893250
- Bertassoli Junior, DJ; Sawakuchi, AO; Sawakuchi, HO et al. (2018): Magnetic susceptibility from sediment core XC05 from the Xingu River, Brazil. https://doi.org/10.1594/PANGAEA.893247