References of "Fagel, Nathalie"
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See detailRoman road pollution assessed by elemental and lead isotope geochemistry in East Belgium
Renson, Virginie; Fagel, Nathalie ULg; Mattielli, Nadine et al

in Applied Geochemistry (2008), 23(12), 3253-3266

The ability of inorganic geochemistry to record environmental change and especially human impact has been evidenced by several studies across Europe, especially in peat, where it is possible to record the ... [more ▼]

The ability of inorganic geochemistry to record environmental change and especially human impact has been evidenced by several studies across Europe, especially in peat, where it is possible to record the impact of agriculture, mining and other industries. However, despite the numerous investigations on the impact of ancient human activities such as ore mining and smelting, little attention has been paid to geochemistry as a tool to solve problems of palaeopollution in the surroundings of archaeological sites. This paper presents geochemical evidence of the impact of a possible early Roman road built in SE Belgian peatland. Increased Zn and Pb concentrations suggest that Pb-Zn ores were transported on the road, Lead isotope analyses suggest that these ores are locally derived, being compatible with those found in the nearby Pb-Zn ore deposits from East Belgium. Present results provide direct evidence that East Belgian Pb-Zn ores were already being mined during Roman times, i.e. earlier than previously suspected (i.e. 14th century) and that Zn appears to be relatively immobile here. On a broader scale, it also demonstrates that such an early road already had an impact on the environment in terms of metal pollution. This paper enlarges on the range of possibilities offered by geochemistry in the field of geoarchaeology. (C) 2008 Elsevier Ltd. All rights reserved. [less ▲]

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See detailHolocene Records of Aerosols in Continental Environments (HoRACE)
Le Roux; De Vleeschouwer, F.; Cherbukin et al

Conference (2008)

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See detailDevelopment of a "pre-anthropogenic" peat standard for geochemical, paleo-environmental and archaeological investigations
Le Roux; De Vleeschouwer, F.; Cheburkin et al

Poster (2008)

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See detailRecent climatic instability in Poland and effect of Little Ice Age on human activities
De Vleeschouwer, F.; Lamentovicz, M.; Piotrowska, N. et al

Poster (2008)

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See detailDevelopment and application of high-resolution petrography on resin-impregnated Holocene peat columns to detect and analyse tephras, cryptotephras, and other materials
De Vleeschouwer, François ULg; van Vliet-Lanoe, Brigitte; Fagel, Nathalie ULg et al

in Quaternary International (2008), 178

We describe the potential for high-resolution detection, observation and chemical analysis of tephras and cryptotephras in freeze-dried and resin-impregnated peat sections. Special attention is drawn to ... [more ▼]

We describe the potential for high-resolution detection, observation and chemical analysis of tephras and cryptotephras in freeze-dried and resin-impregnated peat sections. Special attention is drawn to tephra grain alteration products, sensitive to standard lab treatment, but preserved using an impregnation technique developed here. Resulting blocks and thin sections provide a continuous archive of tephras that can be investigated through a wide range of non-destructive techniques encompassing polarising and fluorescence microscopy, scanning electron microscopy with/without elemental analysis, and XRF-based core scanning. (c) 2007 Elsevier Ltd and INQUA. All rights reserved. [less ▲]

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See detailTraces of the last earthquake sequence (1939-1944) along NAF from lacustrine sediments.
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

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See detailSedimentological Fingerprints of Recent Earthquakes in Lake Sediments: A Case Study on the North Anatolian Fault (NAF), Turkey
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

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See detailHolocene instabilities in GIN sea overflows based on mineralogical and Nd/Pb isotopic sedimentary records
Simon, Q.; Fagel, Nathalie ULg; Jennings, A. et al

Poster (2008)

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See detailLacustrine record of Late Pleistocene and Holocene climate evolution, volcanism and seismic activity in Lake Puyehue (Chilean Lake District)
De Batist, M.; Fagel, Nathalie ULg; Loutre, M. F. et al

Book published by Journal of Paleolimnology (2008)

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See detailHolocene records of regional dust deposition using peat bogs
Le Roux, G.; De Vleeschouwer, F.; Cheburkin, A. et al

Poster (2008)

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See detailNd and Pb isotopic signatures of detrital fractions from Labrador Sea and Iceland Basin sediments: Deep oceanic circulation changes over the Holocene
Fagel, Nathalie ULg; Brasseur; Mattielli, N. et al

in Geochimica et Cosmochimica Acta (2008), 72(12), 251-251

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See detailClay-mineral record in Lake Baikal sediments: The Holocene and Late Glacial transition
Fagel, Nathalie ULg; Boes, Xavier

in Palaeogeography, Palaeoclimatology, Palaeoecology (2008), 259(2-3), 230-243

We analyse the clay-mineralogical composition of two 1-m long cores from elevated plateaus in the southern and northern basins of Lake Baikal. Our aim is to test the limits of classically used clay ... [more ▼]

We analyse the clay-mineralogical composition of two 1-m long cores from elevated plateaus in the southern and northern basins of Lake Baikal. Our aim is to test the limits of classically used clay proxies for climate reconstructions. Mineralogical signature is determined by X-ray diffraction on oriented aggregates from Holocene and Late Glacial sediments. Mineralogical results are presented on a palaeomagnetic-derived time scale. Sampling at a centimeter resolution allows for a sub-millenial order reconstruction. The evolution of clay-derived climate proxies (smectite/illite peak intensity ratio, S/I) is compared between the two locations, with respect to other climate reconstructions for the Lake Baikal area and Siberia. During the Late Glacial punctual increases of S/I are related to changes of particle source rather than any climate change. At both sites the most intense chemical weathering conditions occured during the Subboreal, lagging the Eurasian middle Atlantic climate optimum. S/I follows a gradual but irregular increase through the Holocene, probably related to slow warming favourable to the development of the Siberian soils. The different sensitivity to hydrolysing conditions in northern and southern sites can be explained by a combination of local lithological and topographical parameters. (c) 2007 Elsevier B.V. All rights reserved. [less ▲]

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See detailAssembly and concept of a web-based GIS within the paleolimnological project CONTINENT (Lake Baikal, Russia)
Heim, Birgit; Klump, Jens; Oberhaensli, Hedi et al

in Journal of Paleolimnology (2008), 39(4), 567-584

Web-based Geographical Information Systems (GIS) are excellent tools within interdisciplinary and multi-national geoscience projects to exchange and visualize project data. The web-based GIS presented in ... [more ▼]

Web-based Geographical Information Systems (GIS) are excellent tools within interdisciplinary and multi-national geoscience projects to exchange and visualize project data. The web-based GIS presented in this paper was designed for the paleolimnological project 'High-resolution CONTINENTal paleoclimate record in Lake Baikal' (CONTINENT) (Lake Baikal, Siberia, Russia) to allow the interactive handling of spatial data. The GIS database combines project data (core positions, sample positions, thematic maps) with auxiliary spatial data sets that were downloaded from freely available data sources on the world wide web. The reliability of the external data was evaluated and suitable new spatial datasets were processed according to the scientific questions of the project. GIS analysis of the data was used to assist studies on sediment provenance in Lake Baikal, or to help answer questions such as whether the visualization of present-day vegetation distribution and pollen distribution supports the conclusions derived from palynological analyses. The refined geodata are returned back to the scientific community by using online data publication portals. Data were made citeable by assigning persistent identifiers (DOI) and were published through the German National Library for Science and Technology (TIB Hannover, Hannover, Germany). [less ▲]

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See detailWeathering in the Lake Baikal watershed during the Kazantsevo (Eemian) interglacial: Evidence from the lacustrine clay record
Fagel, Nathalie ULg; Mackay, Anson W

in Palaeogeography, Palaeoclimatology, Palaeoecology (2008), 259(2-3), 244-257

The clay-mineralogical record of a piston core recovered on an elevated plateau in the northern basin of Lake Baikal has been investigated for the Kazantsevo interglacial period (i.e., Eemian s.s ... [more ▼]

The clay-mineralogical record of a piston core recovered on an elevated plateau in the northern basin of Lake Baikal has been investigated for the Kazantsevo interglacial period (i.e., Eemian s.s. equivalent in northern Europe). The age model (as inferred from palaeomagnetic intensity) suggests that this stage spans ca. 128 to 117 kyr BP. Relative clay mineral abundances and clay-mineral ratios are used to reconstruct the weathering conditions within the Baikal watershed at a sub-millennial resolution, and suggest that the clay record is highly variable. A bimodal clay-data distribution is in agreement with different clay sources and/or formation between the studied glacial and interglacial periods. High amounts of smectites in the Taz glacial samples (128.7-136.4 kyr BP) may be explained by an additional source of neoformed smectites during the glacial stage. In addition to the classically used smectite/illite ratio, the mineralogical results are integrated by the calculation of a hydrolysis index that takes into account the abundance of all clay species and their sensitivity to chemical weathering. A principal components analysis (PCA) of the Baikal clay minerals allows the comparison of the clay parameters with regard to weathering conditions. Clay data are further compared (i) with diatom and pollen profiles, (ii) with pollen-based quantitative reconstructions for the same core material, and (iii) with other climate reconstructions for the Lake Baikal region and Siberia. Several features of our record are highlighted here. During the early period of the Kazantsevo interglacial (128.4-125.2 kyr BP), weathering processes remain controlled by physical reworking for more than 2 kyr after the initial transition from cold to warm conditions. Inception of chemical weathering starts only after ca. 125 kyr BP, a period coincident with the warmest conditions according to both the pollen record and by the strongest chernozem development in Siberian soils. Within the interglacial interval, the hydrolysis index displays a two-step increase, punctuated by a minimum value ca. 122 kyr BP. The increasing but irregular trend persists after the transition from the Kazantsevo interglacial to the Zyryanka glacial (similar to 117 kyr BP). Peak chemical weathering, as inferred by clay changes, lags the interglacial/ glacial transition by at least 2 kyr. This suggests that pedogenesis remains active after the interval of surface stabilization. Lake Baikal clay minerals trace the nature of the main weathering conditions within the watershed. We note any increase in physical weathering is rapidly recorded in sedimentary clay assemblages but the mineral imprint to chemical weathering changes is more gradual, lagging reconstructed climate conditions over the lake by ca. 2 kyr. 0 2007 Elsevier B.V.. All rights reserved. [less ▲]

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See detailSpatial and temporal (30 yr.) variations of lead geochemical signature in a macrotidal highly polluted estuary
Taillez, A.; Jacqmot, A.; Petit, Jérôme et al

in Geochimica et Cosmochimica Acta (2007, August), 71(15, Suppl. S), 993-993

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