References of "Keppens, E"
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See detailCarbon-isotope analysis of fossil wood and dispersed organic matter from the terrestrial Wealden facies of Hautrage (Mons Basin, Belgium).
Yans, Johan; Gerards, Thomas ULg; Gerrienne, Philippe ULg et al

in Palaeogeography, Palaeoclimatology, Palaeoecology (2010), 291

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See detailEchinoderm skeletons record sea temperatures
Ranner, Herwig; Ladrière, Ophélie ULg; Navez, Jacques et al

Poster (2006)

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See detailEchinoderm skeletons record sea temperatures
Ranner, Herwig; Ladrière, Ophélie ULg; Navez, Jacques et al

Poster (2005, December 31)

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See detailEffects of temperature on the chemistry of the echinoderm skeleton
Ranner, Herwig; Ladrière, Ophélie ULg; Navez, Jacques et al

Poster (2004)

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See detailEnvironmental effects on the chemistry of the echinoderm skeleton
Ranner, Herwig; de Jonghe, Caroline; Ladrière, Ophélie ULg et al

Poster (2004)

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See detailFaunal/floral and isotopic responses to Milankovitch precession cycles and environmental changes in the upper Gulpen Formation (Upper Maastrichtian) at the CBR-Lixhe and ENCI-Maastricht bv quarries
Felder, P. J.; Keppens, E.; De Clercq, Bernadette ULg et al

in Netherlands Journal of Geosciences-Geologie en Mijnbouw (2003), 82(3), 275-281

Two sections, just below the Nivelle Horizon in the upper Gulpen Formation (Upper Maastrichtian), and seven kilometres apart (CBR-Lixhe and ENCI-Maastricht bv quarries) have been analysed (samples every 5 ... [more ▼]

Two sections, just below the Nivelle Horizon in the upper Gulpen Formation (Upper Maastrichtian), and seven kilometres apart (CBR-Lixhe and ENCI-Maastricht bv quarries) have been analysed (samples every 5 cm) for dinocyst, pollen grains and bioclast contents as well as for carbon and oxygen isotopic composition, to obtain better insight into the influence of weathering on these sediments. The CBR section lies above groundwater level, while that at the ENCI quarry is some metres below. At the former quarry we recognised the influences of weathering (karst) nearby. At ENCI, palynological, bioclast and stable isotope results of the carbonate phase (mainly consisting of coccoliths) co-vary remarkably, displaying two cycles which may be interpreted tentatively as climatic fluctuations. The partial derivative(18)O curve varies roughly between -1.6parts per thousand and -1.1parts per thousand (on PDB scale), corresponding to a temperature change of about 2degreesC. Less negative values (i.e. cooler seawater) coincide with larger amounts of pollen of Normapolles and Triporates type assumed to represent temperate forest elements of a vegetation also containing tropical elements such as palms. Assuming the 5 cm sample intervals at ENCI to correspond to 1 ka, climatic maxima (and minima) may be 20-25 ka apart, obviously recalling Milankovitch precession cycles. These are independent of a sharp sedimentological change noted in the upper part of the lowest cycle (samples 42 to 24). Upwards of sample 42, bioclast contents increase and dinocysts, Spiniferites in particular, decrease significantly, corresponding to a marked shallowing. This turning point is also recorded in the partial derivative(13)C curve at ENCI. Bioclast percentages appear to follow composite trends that are influenced by both climatic and sedimentological conditions. [less ▲]

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See detailDiagenèse des monticules micritiques de la partie supérieure du Frasnien du Synclinorium de Dinant (Belgique, France)
Boulvain, Frédéric ULg; Herbosch, A.; Keppens, E.

in Comptes Rendus de l'Académie des Sciences. Série II, Mécanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre (1992), 315

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