ABSTRACT Upper Visean limestones in the Campine Basin of northern Belgium are intensively fractured. The largest and most common fractures are cemented by non‐ferroan, dull brown‐orange luminescent blocky calcite. First melting temperatures of fluid inclusions in these calcites are around ‐57°C, suggesting that precipitation of the cements occurred from NaCl‐CaCl 2 ‐MgCl 2 fluids. The final melting temperatures ( T m ice ) are between ‐5 and ‐33°C. The broad range in the T m ice data can be explained by the mixing of high salinity fluids with meteoric waters, but other hypotheses may also be valid. Homogenization temperatures from blocky calcite cements in the shelf limestones are interpreted to have formed between 45 and 75°C. In carbonates which were deposited close to and at the shelf margin, precipitation temperatures were possibly in the range 70‐85°C and 72‐93°C, respectively. On the shelf, the calcites have a δ 18 O around ‐9.3‰ PDB and they are interpreted to have grown in a fluid with a δ 18 O between −3.5 and +1.0‰ SMOW. At the shelf margin, blocky calcites (δ 18 O∼ ‐ 13.5‰ PDB) could have precipitated from a fluid with a δ 18 O betweenn ‐4.0 and ‐1.1‰ SMOW. The highest oxygen isotopic compositions are comparable to those of Late Carboniferous marine fluids (δ 18 O= ‐ 1‰ SMOW). The lowest values are more positive than a previously reported composition for Carboniferous meteoric waters (δ 18 O= ‐7‰ SMOW). Precipitation is likely to have occurred in marine‐derived fluids, which mixed with meteoric waters sourced from near the Brabant Massif. Fluids with a similar negative oxygen isotopic composition and high salinity are actually present in Palaeozoic formations. The higher temperature range in the limestones near the shelf margin is explained by the upward migration of fluids from the ‘basinal’ area along fractures and faults into the shelf.

Recrystallization (geology)

Pseudomorph

10.1111/j.1365-3091.1994.tb01395.x

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Evolution of porosity in extruded stoneware as a function of firing temperature

Applied Clay Science (1993)

O. Delbrouck James C. Janssen Raoul Ottenburgs P. Van Oyen Willy Viaene

10.1016/0169-1317(93)90036-z

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Citations (30)

The occurrence of a microbial buildup at Poederlee (Campine Basin, Belgium) : biostratigraphy, sedimentology, early diagenesis and significance for early Warnantian paleogeography

Philippe Muchez Willy Viaene Jos Bouckaert Raphaël Conil Michiel Dusar

Le sondage de Poederlee (Bassin de Campine) a ete implante dans une structure en dome affectant le sommet du Dinantien, reconnue par des etudes de reflexion sismique. Il a recoupe des calcaires attribues sur base des foraminiferes et des coraux au Warnantien inferieur (biosubzones Cf6γ et RC7α,s).Deux types de lithofacies ont ete determines. Le premier consiste en des bindstones cyanobacteriens developpes immediatement sous le niveau d'agitation des vagues et formant le corps d'une construction biohermale; le second type de lithofacies comprend des packstones et des grainstones bioclastiques deposes dans la zone d'agitation des vagues et qui, surmontant le precedent lithofacies, forment les flancs et le sommet de l'edifice. Cinq sequences biohermales ont ete reconnues dans le sondage et suggerent l'existence d'un complexe recifal. La comparaison de ces edifices biohermaux avec d'autres connus dans le Warnantien du Bassin de Campine fait ressortir l'influence de leur position paleogeographique sur leur developpement.La diagenese a commence avec des calcites fibreuses isopaques et fibro-radiaxiales, qui ont ete precipitees a partir d'eaux marines oxydees. Des ciments syntaxiaux (rim cements) se sont developpes a partir d'echinodermes dans un fluide capillaire, oxydant a reducteur, ainsi que le montrent leurs caracteristiques en analyse par cathodoluminescence.

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Minéralogie du gisement de Kipushi, Shaba, Zaïre

Annales de la Société géologique de Belgique (1974)

W. De Vos Willy Viaene Jules Moreau Jacques Wautier

Le gisement de Kipushi est caracterise par une mineralisation sulfuree tres riche en cuivre et en zinc. Outre ces elements majeurs, le minerai contient localement des concentrations en Pb, Ge, Ga, Mo, W et V.La premiere partie du travail est consacree a un apercu general des parageneses essentielles du gisement : six types de minerais ont ete reconnus suivant le rapport metal/soufre et suivant l'abondance relative des mineraux principaux : chalcopyrite, bornite, chalcosite, tennantite, blende et pyrite.La deuxieme partie est centree sur l'etude des mineraux germaniferes et galliferes et leur paragenese. On rencontre a Kipushi les trois sulfures germaniferes renierite, briartite, germanite. Associes a ceux-ci, on trouve la mawsonite, la tungstenite, une sulvanite germanifere et un sulfure de Cu, Ge, Zn, V non identifie.Le gallium, dont la presence est liee a celle du germanium, se concentre essentiellement dans la gallite qui forme des textures de demixtion avec la blende et la chalcopyrite. On trouve egalement des teneurs appreciables de gallium dans la briartite et la chalcopyrite.

Bornite

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Petrographical, mineralogical and chemical characterisation of lime mortars in the Saint Michael's church (Leuven, Belgium)

K Callebaut Willy Viaene Koenraad Van Balen Raoul Ottenburgs

Lime mortar

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Geochemical soil prospecting in Northwest Kalimantan, Indonesia

Journal of Geochemical Exploration (1981)

Willy Viaene T. Suhanda N. Vandenberghe Y. Sunarya Raoul Ottenburgs

Prospecting

Molybdenite

Lithology

10.1016/0375-6742(81)90079-0

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Petrographical, mineralogical and chemical investigation of 17th and 19th century lime mortars in the St.-Michael's church (Leuven, Belgium)

Restoration of Buildings and Monuments (1999)

K Callebaut Willy Viaene K. van Baien Raoul Ottenburgs

Petrographical, mineralogical and chemical analyses have been used to characterize historical lime mortars in the Saint-Michael's church (Leuven, Belgium). An analysis method is proposed for a mineralogical (petrography, XRD-analysis and SEM-EDX-analysis) and chemical characterization of historical mortars. Four groups of mortars have been distinguished and indications for the processes of mortar production and for the provenance of the raw materials used for these mortars have been found. Lime was burnt in vertical lime kilns and dry slaked. The provenance of the aggregate was local and the lime was imported from Namur (SW of Belgium) and Tournai (SW of Belgium). A change in binder type and properties of the lime mortars from the 17th century original mortars (air-hardening) to the 19th century restoration mortars (hydraulic) has been observed.

10.1515/rbm-1999-5408

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Geochemical constraints on the origin and migration ofpalaeofluida at the northern margin of the Variscan foreland,southern Belgium.

Philippe Muchez Marek Slobodník Willy Viaene E. Keppens

Margin (machine learning)

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The ionic model: Extension to spatial charge distributions, derivation of an interaction potential for silica polymorphs

Physics and Chemistry of Minerals (1995)

E. Tijskens Willy Viaene Paul Geerlings

Electrostatics

10.1007/bf00202299

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Citations (5)