References of "Fagel, Nathalie"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailAnthropogenic impacts in North Poland over the last 1300 years -- A record of Pb, Zn, Cu, Ni and S in an ombrotrophic peat bog
De Vleeschouwer, François ULg; Fagel, Nathalie ULg; Cheburkin, Andriy et al

in Science of the Total Environment (2009)

Lead pollution history over Northern Poland was reconstructed for the last ca. 1300 years using the elemental and Pb isotope geochemistry of a dated Polish peat bog. The data show that Polish Pb–Zn ores ... [more ▼]

Lead pollution history over Northern Poland was reconstructed for the last ca. 1300 years using the elemental and Pb isotope geochemistry of a dated Polish peat bog. The data show that Polish Pb–Zn ores and coal were the main sources of Pb, other heavy metals and S over Northern Poland up until the industrial revolution. After review of the potential mobility of each element, most of the historical interpretation was based on Pb and Pb isotopes, the other chemical elements (Zn, Cu, Ni, S) being considered secondary indicators of pollution. During the last century, leaded gasoline also contributed to anthropogenic Pb pollution over Poland. Coal and Pb–Zn ores, however, remained important sources of pollution in Eastern European countries during the last 50 years, as demonstrated by a high 206Pb/207Pb ratio (1.153)relative to that of Western Europe (ca. 1.10). The Pb data for the last century were also in good agreement with modelled Pb inventories over Poland and the Baltic region. [less ▲]

Detailed reference viewed: 48 (7 ULg)
Full Text
Peer Reviewed
See detailMultiproxy evidence of `Little Ice Age' palaeoenvironmental changes in a peat bog from northern Poland
De Vleeschouwer, François ULg; Piotrowska, Natalia; Sikorski, Jaroslaw et al

in Holocene (2009), 19(4), 625-637

`Little Ice Age' (LIA) climatic deteriorations have been abundantly documented in various archives such as ice, lake sediments and peat bog deposits. Palaeoecological analyses of peat samples have ... [more ▼]

`Little Ice Age' (LIA) climatic deteriorations have been abundantly documented in various archives such as ice, lake sediments and peat bog deposits. Palaeoecological analyses of peat samples have identified these climatic deteriorations using a range of techniques, for example palynology, plant macrofossils, testate amoebae or carbon isotopic analyses. The use of inorganic geochemistry and the reconstruction of dust fluxes has remained a challenge in tracing the nature of LIA climatic changes. Although the idea of enhanced erosion conditions and storminess is commonly discussed, the conditions for dust deposition in peatlands over Europe during the LIA are rarely favourable, because the natural forest cover over Europe was much more important than nowadays, preventing dust deposition. This intense forest canopy masks the deposition of dust in peatlands. In northern Poland, near the Baltic shore, the S[l]owi[n]skie B[l]ota area was deforested around AD 1100, ie, just before the LIA, and therefore constitutes a key area for the reconstruction of LIA climatic change. With the support of a well-constrained chronology, climatic fluctuations are recorded in an ombrotrophic bog using inorganic geochemistry, plant macrofossils and carbon isotopic analyses. The reconstruction of LIA climatic changes is in good agreement with other records from Poland and NE Europe. However, a c. 50-year discrepancy can be observed between various records. This discrepancy is possibly due to progressive time-dependent cooling gradient from north to south Europe. [less ▲]

Detailed reference viewed: 177 (15 ULg)
Full Text
See detailHolocene environmental changes in lake sediments from Northern Chilean Patagonia
Nuttin; Fagel, Nathalie ULg; Brogniet et al

Poster (2009)

Detailed reference viewed: 29 (0 ULg)
Full Text
See detailENVIRONMENTAL ASPECTS OF CLAY EXPLOITATION FOR FIRED CLAY BRICKS IN CAMEROON
Njoya, A.; Bastin, D.; Melo, U. et al

Poster (2009)

Detailed reference viewed: 46 (11 ULg)
Full Text
See detail3D anatomy of Heinrich Layer 2.
Van Rooij, D.; Zaazi, N.; Fagel, Nathalie ULg et al

Poster (2009)

Detailed reference viewed: 6 (1 ULg)
Full Text
See detailHolocene environmental changes in lake sediments from Northern Chilean Patagonia (45-48°S)
Nuttin, L.; Fagel, Nathalie ULg; Bertrand, S. et al

Poster (2009)

Detailed reference viewed: 8 (2 ULg)
Full Text
See detailReconstruction of oceanic circulation using mineralogical and isotopical signatures of deep sea sediments. The case study of the northern Noth Atlantic…and some perspectives for the Arctic
Fagel, Nathalie ULg

in Nihoul, Jacques; Kostianoy, Andrey (Eds.) Influence of climate change on the changing arctic and sub-arctic conditions (2009)

Detailed reference viewed: 5 (2 ULg)
Full Text
See detailSedimentological fingerprints of recent earthquakes in lake sediments: A case study on the North Anatolian Fault (NAF), Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1919

Detailed reference viewed: 13 (0 ULg)
See detailKuzey Anadolu Fayı Üzerinde Yer Alan Sığ Göllerde Tarihsel Depremlerin Sedimantolojik İzlerinin Araştırılması
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

Conference (2008, November)

Detailed reference viewed: 8 (1 ULg)
See detailSedimentological traces of earthquakes in recent lakes sediments along the North Anatolian Fault, Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

Conference (2008, October)

Detailed reference viewed: 4 (0 ULg)
See detailCaractérisation minéralogique des argiles Crétacé et Pliocène de la région Tanger-Tétouan (NW du Maroc) en vue de leur valorisation industrielle
El Ouahabi, Meriam ULg; Ben Moussa, Abelkhalek; Fagel, Nathalie ULg

Conference (2008, June)

Notre étude s’intéresse aux gisements d’argiles Crétacé et Pliocène de la région Tanger Tétouan au NW du Maroc. Dans cette région, les argiles crétacées sont utilisées en particulier dans l’industrie des ... [more ▼]

Notre étude s’intéresse aux gisements d’argiles Crétacé et Pliocène de la région Tanger Tétouan au NW du Maroc. Dans cette région, les argiles crétacées sont utilisées en particulier dans l’industrie des céramiques de murs et des briques. Les formations pliocènes inférieures, constituées d’un mélange de marnes, de sables et de graviers, sont traditionnellement utilisées comme matière première dans la production de poteries. Une quarantaine d’échantillons ont étés prélevés sur plus de vingt sites dans des formations à dominance argileuse qui affleurent dans le domaine rifain. Les analyses minéralogiques par diffraction des rayons X (D8 Advance) ont fait l’objet d’une analyse de la minéralogie totale sur poudre et d’une analyse de la fraction argileuse < 2 microns sur agrégat orienté ainsi que des essais géotechniques (limites d’Atterberg) Le cortège minéralogique est assez diversifié. La minéralogie totale est composée de quartz (47 %), feldspath (4 à 12 %.), carbonates (calcite de traces jusqu’à 43 % et dolomite de traces jusqu’à 23 %) et muscovite (49 %). Les minéraux argileux de base sont: chlorite – kaolinite – illites avec la présence d’interstratifiés (vermiculitesmectite et chlorites-vermiculite). Les argiles prises des formations crétacées contiennent une grande proportion de chlorites, de kaolinites, de illites et d’interstratifiés chlorite-vermiculite, alors que les argiles pliocènes renferment moins de chlorites, de smectites, de vermiculites et de kaolinites. Les limites d'Atterberg montrent des indices de plasticité (IP) inférieurs à 10% pour les pélites gris-vert de l’unité de Tanger interne tandis que des indices de plasticité sont compris entre 10 et 50% pour les argiles de l’unité de Tanger externe. Les limites d’élasticité (WP) oscillent entre 20 et 40%, et les limites de plasticité (WL) se situent entre 20 et 70%. Les résultats montrent que le cortège argileux extrait des sédiments crétacés et pliocènes de la zone d’étude est caractérisé par une variété en composition minéralogique et une hétérogénéité de la composition argileuse au sein de même site, tandis que les limites d’Atterberg montrent une plasticité moyenne pour l’unité de Tanger interne et une plasticité élevée pour les argiles de l’unité de Tanger externe [less ▲]

Detailed reference viewed: 26 (4 ULg)
Full Text
Peer Reviewed
See detailNature, origin, transport and deposition of andosol parent material in south-central Chile (36-42 degrees S)
Bertrand, Sebastien; Fagel, Nathalie ULg

in Catena (2008), 73(1), 10-22

The andosols of south-central Chile (36-42 degrees S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the ... [more ▼]

The andosols of south-central Chile (36-42 degrees S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the nature, origin, mode of transport and deposition of the andosol parent material have been advanced but no general agreement has been found. In this paper, we test these hypotheses by analyzing new representative outcrops located around Icalma (38 degrees 50'S) and Puyehue (40 degrees 40'S) lakes by a pluri-methodological approach. Our data demonstrate that the andosol parent material has the typical mineralogical and geochemical signature of the regional volcanism and that these deposits are post-glacial in age. The grain size of the deposits and the morphology of the coarse grains evidence that most of these particles haven't been re-transported by wind but are direct volcanic ash falls deposited throughout the Late Glacial and Holocene. Because of the prevailing westerly winds, most of these volcanic ashes have been transported to the East. Following the deposition of the volcanic particles, weathering and pedogenetic processes have transformed part of the volcanic glasses and plagioclases into allophane and have wiped out the original layering. This work demonstrates that most of the andosols that occur in the Andes and in the eastern part of the Intermediate Depression of south-central Chile are developed on volcanic ashes directly deposited by successive volcanic eruptions throughout the Late Glacial and Holocene. (C) 2007 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 57 (5 ULg)
Full Text
Peer Reviewed
See detailHolocene records of regional dust deposition using peat bogs
Le Roux, G.; De Vleeschouwer, François; Cheburkin, A. et al

in Geochimica et Cosmochimica Acta (2008), 72(12), 535-535

Detailed reference viewed: 15 (0 ULg)
Full Text
See detailIntercomparison of lead 210 and radiocarbon bomb pulse age models. A key study in a peat bog core from North Poland
Piotrowska, Natalia; De Vleeschouwer, François; Sikorski, Jaroslaw et al

Poster (2008)

Detailed reference viewed: 10 (4 ULg)
Full Text
Peer Reviewed
See detailTiming of the late glacial and Younger Dryas cold reversal in southern Chile varved sediments
Boes, Xavier; Fagel, Nathalie ULg

in Journal of Paleolimnology (2008), 39(2), 267-281

The timing of the last deglaciation in southern Chile is re-evaluated from a calendar varve chronology (Lago Puyehue, 40 degrees S). The climate shifts are analysed by continuous annual varve-thickness ... [more ▼]

The timing of the last deglaciation in southern Chile is re-evaluated from a calendar varve chronology (Lago Puyehue, 40 degrees S). The climate shifts are analysed by continuous annual varve-thickness measurements through the similar to 17,100 cal. year to 10,800 cal. year BP time window (similar to 3.5 m sediment core). The varve years are determined by the alternation of light (phytoplankton-rich) and dark (terrigenous and organic-rich) layers forming graded annual couplets (similar to 0.2 to 0.8 mm/year). The varve chronology is constructed by conventional varve-counting methods on thin sections after correction for instantaneous volcanic and/or seismic events detected in the thin sections. The calibrated varve-age model derived from the manual varve counting is constrained by high-resolution grey-scale (GS) semi-automatic counts of the annual light phytoplankton-rich layers (similar to 120 mu m to 300 mu m thick). Due to physical sediment properties the GS constitutes a proxy record for the phytoplankton/terrigenous varve-thickness variations through the sediment record. The varve couplets are thicker/thinner during humid/dry phases and darker/lighter (negative/positive annual grey-scale index) during cold/warm phases. Our results show that at 40 degrees S the last deglaciation took place in two phases between similar to 17,100 cal. year and similar to 15,500 cal. year BP. We note a climate instability between similar to 15,500 cal. year and 13,300 cal. year BP and a significant dry phase between similar to 15,000 and 14,500 cal. year BP. We evidence a cold event in two phases between similar to 13,300 and 12,200 cal. year BP interrupted by a dry event between similar to 12,800 and 12,600 cal. year BP. The onset of a significant warmer period is observed after similar to 11,500 cal. year BP. Our results provide new evidence of a Younger Dryas cool reversal in southern Chile, i.e., the Huelmo/Mascardi event Hajdas et al. (2003) associated with an abrupt dry pulse at similar to 12,800-12,600 cal. year BP. The high-resolution grey-scale measurements performed on the biogenic varves from Lago Puyehue provide a reliable calibrated chronology of the regional environmental and climate shifts during the last deglaciation. [less ▲]

Detailed reference viewed: 373 (4 ULg)