E. Keppens

Variscan Veins: record of fluid circulation and Variscan tectonothermal events in Upper Palaeozoic limestones of the Moravian Karst, Czech Republic (2006)

Kral, J, Keppens, E

CHALLACEA: High-resolution, multi-proxy climate reconstruction for equatorial East Africa (21 ka BP to present) from laminated lake sediments near Mt. Kilimanjaro (2006)

Verschuren, D., Haug, G., Sinninghe Damsté, J., Geel, B. Van, Conley, D., Batist, M. De, ...

Columnar calcites as testimony of diagenetic overprinting at the boundary between Upper Tournaisian dolomites and limestones (Belgium): multiple origins for apparently similar features (2005)

Heijlen, W, Fallick, AET, Keppens, E, Weis, D, ...

In topographic flat areas, sedimentary settings may vary from one outcrop to another. In these settings, calcite precipitates may yield macroscopically similar columnar features, although they are...

Faunal/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 (2003)

Felder, P.J., Keppens, E., Declercq, B., Normand, S., Streel, M.

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...

Carbonate-hosted Zn-Pb deposits in Upper Silesia, Poland: Origin and evolution of mineralizing fluids and constraints on genetic models (2003)

Banks, DA, Kuchia, H, Keppens, E

Microthermometric and crush-leach analyses of fluid inclusions in ore and gangue minerals of the Upper Silesian Zn-Pb deposits, Poland, along with first results of Rb-Sr geochronology on sulfides,...

Diagenesis at exposure surfaces in a transgressive systems tract in a third-order sequence (Lower Carboniferous, Belgium) (2003)

Keppens, E

Visean limestones in Belgium show evidence for marine early diagenesis followed by meteoric and then deeper burial diagenesis. The fourth-order sequence boundaries have no influence on the diagenetic...

Biological and diagenetic influence in Recent and fossil tufa deposits from Belgium (1999)

Janssen, Anneleen; U0014552, Podoor, Nicole; U0002592, Keppens, E

Both Recent and fossil tufa deposits from Belgium were studied by petrographical and geochemical means. Study of the Recent deposits provides information on precipitation conditions and on possible...

Origin of calcite rosettes, palisade crusts and columnar calcites at the contact between dolomites and limestones in the Lower Carboniferous of Belgium (1999)

Nielsen, P, Keppens, E

Bacterially-mediated formation of carbonate concretions in the Rupelian Boom Clay in northern Belgium (1999)

De Craen, M, Keppens, E, Macaulay, C.I, Kiriakoulakis, K

Carbonate concretions in the Oligocene Boom Clay in Northern Belgium grew as a result of bacterially mediated geochemical processes, Concretion distribution patterns are controlled by glacioeustatic...

Evolution of palaeofluids at the Variscan thrust front in eastern Belgium (1998)

Dejonghe, L, Keppens, E

The geochemical evolution of the fluids migrating at the Variscan thrust front in eastern Belgium has been investigated by a petrographic, mineralogical and geochemical study of ankerite, quartz and...

Origin of Dinantian zebra dolomites south of the Brabant-Wales Massif, Belgium (1998)

Nielsen, P, Keppens, E

Zebra dolomites, characterized by a repetition of dark grey (a) and light (b) coloured dolomite sheets building up abbabba-sequences, occur in Dinantian strata from deep boreholes (> 2000 m) south of...

Stable isotope chemistry of gaylussite and nahcolite from the deposits of the crater lake at Malha, northern Sudan. (1998)

MEES, F, REYES, E, KEPPENS, E

Petrography and geochemistry of septarian carbonate concretions from the Boom Clay Formation (Oligocene, Belgium) (1998)

De Craen, M, Keppens, E

The septarian carbonate concretions from the Boom Clay (Belgium) consist mainly of authigenic minerals such as micrite (less than or equal to 70% bulk volume) and pyrite framboids (similar to 3%)....

Spheroidal dolomites in a Visean karst system - Bacterial induced origin? (1997)

Nielsen, P, Dickson, JAD, Fallick, AE, Keppens, E

Spheroidal dolomite crystals occur in the karstified top of a Dinantian dolomite sequence in eastern Belgium. The spheroidal dolomite crystals are best developed at the base of the karst system. The...

A depositional and diagenetic model for the Eocene Sulcis coal bassin of SW-Sardinia (1997)

Dreesen, R, Bossiroy, D, Thorez, J, Fadda, A, Ottelli, L, ...

Origin of zebra dolomites from the Dinantian south of the Brabant-Wales Massif (1997)

Nielsen, P, Keppens, E

palisade and columnar calcite at the boundary between lower Visean dolomites and limestones in E.-Belgium: a discussion on their origins (1997)

Nielsen, P, Groessens, E, Keppens, E

Sedimentology, diagenesis and burial history of Westphalian sandstones of the Floverich borehole (Aachen - Erkenlenz Coal District: Germany) (1996)

Muller, A, Keppens, E

Geochemical constraints on the origin and migration of palaeofluids at the northern margin of the variscan foreland, southern belgium (1995)

Slobodnik, M, Viaene, Wa, Keppens, E

Three major fracture types in the Dinantian of the Namur syncline at the northern margin of the Variscan foreland in southern Belgium, have been investigated by fluid inclusion and stable isotope...

Mississippi valley-type pb-zn mineralization in eastern belgium - indications for gravity-driven flow (1994)

Slobodnik, M, Keppens, E

Mississippi Valley-type deposits are widespread in Carboniferous strata in eastern Belgium. Five successive Fe-rich, fracture-filling calcite generations have been recognized in the veins containing...

Multiple-step recrystallization within massive ancient dolomite units - an example from the dinantian of belgium (1994)

Nielsen, P, Keppens, E

South of the Caledonian Brabant - Wales Massif a more than 200 m thick Tournaisian to Lower Visean replacive dolomite unit can be followed for several hundred kilometres from the Boulonnais (France)...

Stable isotopic composition of paleosols in the lower visean of eastern belgium - evidence of evaporation and soil-gas co2 (1993)

Muchez, Philippe; U0013297, Peeters, C, Keppens, E, Viaene, Wa

Numerous paleosols occur in the Lower Visean peritidal limestones of eastern Belgium. At the top of the peritidal unit, a widespread paleosol horizon occurs which has been analysed for its carbon and...

Stable isotopic composition of an evaporite dissolution breccia in the lower visean limestones of se belgium (1992)

Muchez, Philippe; U0013297, Peeters, C, Viaene, Willy; U0005819, Keppens, E

An evaporitic dissolution breccia occurs in the Lower Visean limestones of southeastern Belgium. Three periods of brecciation have been recognized, the first of which took place early in the...

Contribution of the 13C-urea breath test to the detection of Helicobacter pylori gastritis in children (1992)

Blecker, U, Devreker, T, Keppens, E, Cadranel, S, ...

Serology, 13C-urea breath test, histology, Campylobacter-like organism testing, and culture were performed in 95 consecutive children to evaluate the contribution of these tests to the detection of...

Diagenèse des monticules micritiques de la partie supérieure du Frasnien du Synclinorium de Dinant (Belgique, France) (1992)

Boulvain, Frédéric, Herbosch, A, Keppens, E

Vein cements and the geochemical evolution of subsurface fluids in the visean of the campine basin (poederlee borehole, belgium) (1991)

Viaene, Wa, Keppens, E, Marshall, Jd

Upper Visean reef-mound carbonates from the Campine Basin, northern Belgium, have a complex diagnetic history, which reflects the evolution of subsurface fluids in the basin. Primary pores became...