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| Riou, Brieuc; Chaumillon, Eric; Chagu, Catherine; Sabatier, Pierre; Schneider, Jean-luc; Walsh, John-patrick; Zawadzki, Atun; Fierro, Daniela. |
| Following recent tsunamis, most studies have focused on the onshore deposits, while the offshore backwash deposits, crucial for a better understanding of the hydrodynamic processes during such events and offering an opportunity for sedimentary archives of past tsunamis, have mostly been omitted. Here, we present a unique sedimentary record of the backwash from two historical tsunamis sampled in a sheltered bay in American Samoa, namely the 2009 South Pacific Tsunami and the 1960 Great Chilean Earthquake Tsunami. Although not always concomitant with a marked grain size change, backwash deposits are identified by terrestrial geochemical and mineralogical signatures, associated with basal soft sediment micro-deformations. These micro-deformations, including... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00659/77079/78407.pdf |
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| Jacq, Kévin; Perrette, Yves; Fanget, Bernard; Sabatier, Pierre; Coquin, Didier; Martinez-lamas, Ruth; Debret, Maxime; Arnaud, Fabien. |
| In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored sediment sample. It was applied to a sediment core of the well-known Lake Bourget (Western Alps, France) to develop and validate a model for downcore high resolution LOI550 measurements used as a proxy of the organic matter. In lake and marine sediment, the organic matter content is widely used, for example, to reconstruct carbon flux variations through time. Organic matter analysis through routine analysis methods... |
| Tipo: Text |
Palavras-chave: Hyperspectral imaging; Chemometrics; Near-infrared spectroscopy; High resolution analysis; Organic matter. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00478/59018/61636.pdf |
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| Gardes, Thomas; Debret, Maxime; Copard, Yoann; Coynel, Alexandra; Deloffre, Julien; Fournier, Matthieu; Revillon, Sidonie; Nizou, Jean; Develle, Anne-lise; Sabatier, Pierre; Marcotte, Stéphane; Patault, Edouard; Faivre, Quentin; Portet-koltalo, Florence. |
| Anthropogenic impacts on rivers have increased significantly over the past ~150 years, particularly at the beginning of the industrial revolution. Among other signs, this impact is manifested through the addition of trace metals and metalloid elements to rivers. The Eure River watershed in France covers an area of 6017 km2 and is a major tributary of the Seine estuary. It is not exempt from anthropogenic pressures and has been exposed to significant metal discharges over the last 80 years. The average concentrations of metals (i.e., Cr, Co, Ni, Cu, Zn, Ag, Cd, Sb, and Pb), in suspended particulate matter currently transported by the river are high compared to the local geochemical background. Moreover, the lack of correlation between concentration... |
| Tipo: Text |
Palavras-chave: Anthropogenic impacts; Trace metals and metalloids; Eure River watershed; Temporal trends; Particulate metal flux; Pb isotopes. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00618/73046/72159.pdf |
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