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| Horbe,Adriana M.C.; Behling,Hermann; Nogueira,Afonso C.R.; Mapes,Russell. |
| The sediments from the Coari lake, a terra firme lake sculpted into Plio-Pleistocene deposits, and the Acará lake, a flooding-type lake developed on Quaternary sediments in the floodplain of the mid-Solimões river, in the western Amazônia, Brazil, were studied to investigate the environmental condition of their developing. This study includes mineral composition, geochemistry, Pb isotope, palinology, radiocarbon-age and morphological framework of the lakes obtained from SRTM satellite images. The geological and the environmental conditions in the two lakes are highly variable and suggest that their evolution reflect autogenic processes under humid rainforest condition. Although kaolinite, quartz, muscovite, illite, and smectite are the main minerals in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pb isotopes; Lacustrine environment; Paleovegetation; Flooding plain; Holocene. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300008 |
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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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| White, Lee F.; Bailey, Ian; Foster, Gavin L.; Allen, Georgina; Kelley, Simon P.; Andrews, John T.; Hogan, Kelly; Dowdeswell, Julian A.; Storey, Craig D.. |
| The provenance of sand-sized ice-rafted debris (IRD) sourced from Greenland is currently difficult to determine. Such knowledge, if it could be ascertained with a high degree of certainty, could be applied to the Greenland-proximal marine records to improve both our understanding of modern-day spatial patterns of iceberg rafting and the past history of the Greenland Ice Sheet (GIS). Recent studies have highlighted the utility of the Pb-isotope composition of individual sand-sized feldspars and the Ar-40/Ar-39 ages of individual sand-sized hornblendes in this regard. However, before any such provenance toolkit can be applied to the palaeo-record, it is necessary first to determine whether this approach can be used to track the sources of known recent... |
| Tipo: Text |
Palavras-chave: Greenland; Ice rafted debris; Ar-Ar; Pb isotopes; Icebergs; Provenance. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53292/54130.pdf |
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