References of "Geologica Belgica"
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See detailMagnetic susceptibility on different sedimentary settings, example from the Devonian of Belgium
Da Silva, Anne-Christine ULg; Mabille, Cédric; Boulvain, Frédéric ULg

in Geologica Belgica (2010, December), 13(4),

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See detailPalaeoenvironmental study and small scale correlations using facies analysis and magnetic susceptibility of the Mid-Emsian (Himmelbaach quarry, Luxembourg).
Michel, Jonathan ULg; Boulvain, Frédéric ULg; Philippo, Simon et al

in Geologica Belgica (2010), 13(4), 447-458

The Himmelbaach quarry is located in the Wiltz Synclinorium in Luxembourg. The rocks outcropping in this quarry correspond to the mid-Emsian Clervaux Shales Formation. Three different facies have been ... [more ▼]

The Himmelbaach quarry is located in the Wiltz Synclinorium in Luxembourg. The rocks outcropping in this quarry correspond to the mid-Emsian Clervaux Shales Formation. Three different facies have been identified in the quarry. An argillaceous sandstone facies with oblique stratifications, cross-stratifications, herring-bones and erosive bases represent the first facies; the second facies is characterized by lenticular- (with connected lenses) to wavy-bedded sandy argillites, argillaceous sandstones and quartz arenites. The last facies corresponds to a quartz arenite with oblique stratification, planar laminations and mud drapes. The base of this facies shows flaser bedding and sigmoidally curved bed surfaces. The palaeoenvironmental study of this area is rather difficult because of the structural deformation and lateral variation of the facies. Due to this deformation, six partial sections (4a to 4f) were sampled here. In order to reconstruct a reliable vertical and lateral succession of the depositional setting, facies analysis and magnetic susceptibility were used. Magnetic susceptibility (MS) is generally applied as a tool for correlation in a deepwater carbonated environment. In this paper we used the MS technique successfully in a siliciclastic proximal setting. Analysis of MS curves as well as the recognition of three marker beds ((1) the last bed of argillaceous sandstones in Facies 1; (2) a thin horizon of carbonated sandstone within Facies 2; (3) the first appearance of the characteristics massive quartzitic beds in Facies 3) allowed the correlation of sections 4a, 4b and 4c. These correlations helped us to reconstruct a vertical and lateral succession of facies, which ultimately led to the recognition of a tide-dominated marginal-marine depositional model composed respectively of tidal channels (Facies 1), a tidal flat (Facies 2) and a tidal sand ridge (Facies 3). This example also shows the usefulness of magnetic susceptibility for small scale correlation, even in a proximal environment such as a marginal-marine setting. [less ▲]

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See detailEarthquake-induced hazards in mountain regions: a review of case histories from Central Asia – an inaugural lecture to the society.
Havenith, Hans-Balder ULg; Bourdeau, Céline

in Geologica Belgica (2010), 13/3

This paper presents a summary of the main trigger factors of earthquake-induced landslides as well as a review of case histories of major landslide-triggering earthquake events in Central Asia. The goal ... [more ▼]

This paper presents a summary of the main trigger factors of earthquake-induced landslides as well as a review of case histories of major landslide-triggering earthquake events in Central Asia. The goal is to analyse the relationship between geological, tectonic and morphological conditions and the susceptibility to seismic slope failure and to show the potential long-term contribution of seismic ground motion dynamics, such as site effects and liquefaction, to slope failure. Case histories related to five M>7 earthquake events in the Tien Shan and Pamir Mountains are outlined: the earthquakes of Kemin in 1911, Sarez in 1911, Khait in 1949, Gissar in 1989 and Suusamyr in 1992. The Kainama earth-flow case history of 2005 is added to document possible mid-term effects of smaller earthquakes. These events show that in the Central Asian Mountains, two types of seismically triggered mass movements may have particularly disastrous effects: massive long rockslides and medium-sized earth flows made of loess – or a mixture of both. Actually, the most catastrophic mass movement of the last century in Central Asia triggered by the 1949 Khait earthquake was a massive long runout rock avalanche, which had gained a very high velocity due to the entrainment of loess sediments and related lubrification. [less ▲]

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See detailCenomanian sands and clays north of the Vesdre valley: the oldest known Cretaceous deposits in eastern Belgium
Demoulin, Alain ULg; Quesnel, Florence; Dupuis, Christian et al

in Geologica Belgica (2010), 11(3), 241-256

A number of motored auger holes have been drilled in 2002 and 2006 in four sand-clay deposits preserved in dissolution pockets within the Dinantian limestones of the watershed north of the Vesdre valley ... [more ▼]

A number of motored auger holes have been drilled in 2002 and 2006 in four sand-clay deposits preserved in dissolution pockets within the Dinantian limestones of the watershed north of the Vesdre valley. These deposits of unknown age are currently classified as (Tertiary) SBL in the new geological map of Wallonia. We present detailed lithostratigraphic logs of the deposits and describe the results of sedimentological and mineralogical analyses. In particular, K-Ar dating of neoformed Mn oxides found at the base of one augerhole at Rechain yielded ages ranging from Cenomanian to Santonian, allowing us to place the Rechain and Andrimont deposits within the early Late Cretaceous. This is fully consistent with their topographic location very close beneath the trace of the pre-Cretaceous erosion surface and makes them the westernmost remains of the Hergenrath Member of the Late Cretaceous Aachen Formation. To the west, the Magnée deposit is more “typical SBL”, probably corresponding to the Late Neogene filling of a dissolution pocket by reworked weathering products of the local Cretaceous cover. [less ▲]

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See detailMagnetic susceptibility, correlations and Palaeozoic environments: foreword.
Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg

in Geologica Belgica (2010), 13(4), 287-290

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See detailThe stratigraphical architecture of the Quaternary deposits as support for hydrogeological modelling of the central zone of Hanoi (Vietnam)
Jusseret, Simon; Baeteman, Cecile; Dassargues, Alain ULg

in Geologica Belgica (2010), 13(1-2), 77-90

The Quaternary deposits of the Hanoi area have been investigated in order to provide information required for the design of a groundwater-flow model. Limited sedimentological data exist from 32 ... [more ▼]

The Quaternary deposits of the Hanoi area have been investigated in order to provide information required for the design of a groundwater-flow model. Limited sedimentological data exist from 32 destructive drillings carried out previously in the study area. The data base contains hydrographical and hydrogeological observations, but few sedimentological details. This is in contrast with the more seaward regions of the area where the Holocene deposits of the Red River plain has previously been studied. However, a comparison of the results obtained in this study with the previous studies indicates that the Hanoi sediment succession developed in an incised valley under conditions of rapid relative sealevel rise until ca. 7-6 a cal BP. The succession consists initially of alluvial floodplain deposits conformably overlain by mud deposited at the head of an estuary which filled with continuing rapid sea-level rise. Once the relative sea-level rise stabilized, fluvial deposition prograded over the adjacent estuarine mud. The development of a groundwater-flow model requires knowledge of the three-dimensional distribution of the various deposits. Despite the paucity of information with respect to sediment description, a model of the entire Quaternary sequence is presented in several lithostratigraphic crosssections and a panel diagram. The latter forms the basis for the construction of a contour map of the base of the Pleistocene and Holocene deposits, and for a sequence map of the Quaternary deposits in the study area. [less ▲]

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See detailMagnetic susceptibility correlation of km-thick Eifelian–Frasnian sections (Ardennes and Moravia)
Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg; Mabille, Cédric et al

in Geologica Belgica (2010), 13(4), 309-318

After briefly introducing the sedimentology of two Eifelian-Frasnian carbonate sections in Belgium and Moravia, this paper focuses on the comparison of the magnetic susceptibility (MS) curves. The ... [more ▼]

After briefly introducing the sedimentology of two Eifelian-Frasnian carbonate sections in Belgium and Moravia, this paper focuses on the comparison of the magnetic susceptibility (MS) curves. The Ardennes section shows highly variable facies, with an alternation of ramp, platform and mound environments. Detrital inputs are locally very important. Time-equivalent facies in the area of the Moravian Karst correspond to rather pure carbonate platform facies, mostly composed of Amphipora beds. This first analyse of long-term trends in Devonian MS in Belgium and Moravia shows a remarkable similarity, despite a very different background of palaeogeographical setting, facies, sedimentary rate and retrogradation-progradation history. However, a relative independence of the MS and the distal-proximal curves, deduced either from the microfacies record (Ardennes) or from shoreline shifts (Moravia) is observed. This questions the nature of the forcing mechanisms that must at least be active at the inter-regional scale. Moravia and the Ardennes are located along the same palaeolatitude, perhaps suggesting some climatically driven mechanisms, responsible for the input of the detrital fraction responsible for the MS in these sediments. Trade winds are potentially responsible for transportation of dust and its widespread distribution in intertropical areas. [less ▲]

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See detailA magnetic susceptibility curve for the Devonian Limestone from Belgium
Boulvain, Frédéric ULg; Mabille, Cédric ULg; Poulain, Geoffrey et al

in Geologica Belgica (2010), 13

This paper proposes a first magnetic susceptibility (MS) curve for the Devonian Limestone from Belgium. A comparison with a large scale depositional model shows the complex relations between MS and ... [more ▼]

This paper proposes a first magnetic susceptibility (MS) curve for the Devonian Limestone from Belgium. A comparison with a large scale depositional model shows the complex relations between MS and paleoenvironments. Other Devonian-scale MS curves from other parts of the world are necessary to constraint these relations. [less ▲]

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See detailXRF major and trace element determination in Fe-Ti oxide minerals
Duchesne, Jean-Clair ULg; Bologne, Guy

in Geologica Belgica (2009), 12(3-4), 205-212

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See detailTowards a palaeogeographical and sequential framework for the Givetian of Belgium
Boulvain, Frédéric ULg; Mabille, Cédric ULg; Poulain, Geoffrey et al

in Geologica Belgica (2009), 12

This paper starts with a review of facies and reef morphologies from the Givet Group in the Ardenne area. Platform initiation and evolution are analyzed and related to external factors at a global scale ... [more ▼]

This paper starts with a review of facies and reef morphologies from the Givet Group in the Ardenne area. Platform initiation and evolution are analyzed and related to external factors at a global scale (sea level changes, climate changes), at a regional scale (local subsidence, change in detrital supply) and to internal factors like organic communities composition. More specifically, the location of reef barriers are related to sea level changes and a sequence stratigraphic canvas is proposed. [less ▲]

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See detailCan we use authigenic phosphate minerals in cave entrance as palaeoenvironmental data recorders? A case study from Walou cave (Belgium)
Pirson, Stéphane; Hatert, Frédéric ULg; Court-Picon, Mona et al

in Geologica Belgica (2008), 12

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See detailDetailed sedimentological study of a non-classical succession for Trois-Fontaines and Terres d'Haurs formations (Lower Givetian, Marenne, Belgium)- Introduction of the Marenne Member
Mabille, Cédric ULg; De Wilde, Clotilde ULg; Hubert, Benoît et al

in Geologica Belgica (2008), 11

This work details for the first time the sedimentology of the Marenne quarry. It exposes a remarkable succession of strata from the Trois-Fontaines Formation and the base of the Terres d’Haurs Formation ... [more ▼]

This work details for the first time the sedimentology of the Marenne quarry. It exposes a remarkable succession of strata from the Trois-Fontaines Formation and the base of the Terres d’Haurs Formation. Two sections (Marenne East and Marenne Centre) are investigated within the quarry. The first one (115 metres) covers both formations and is characterized by a mixed carbonate-siliciclastic succession replacing the classical base of the Trois-Fontaines Formation. We propose here to include these particular facies into a new member of the Trois-Fontaines Formation, the Marenne Member. The second one (48 metres) exposes a reefal lens also attributed to this new Marenne Member. Magnetic susceptibility was used to confirm geometric correlations previously obtained between these two sections. Petrographic study leads to the definition of 14 microfacies which are integrated into three palaeoenvironmental models. The first model (six microfacies) is proposed for the Marenne Member. In this ramp model, terrigenous inputs are particularly important. The mid-ramp is composed of four microfacies more or less influenced by storm events. The inner ramp (limited to the FWWB vicinity) is characterized by the development of the reefal lens and by peloidal microfacies. The upper part of Trois-Fontaines Formation is depicted by a back-reef model (three microfacies) which is mainly dominated by lagoons. However, intermittent agitation and non-restricted settings allow the local development and the reworking of branching organisms. The last model proposed (five microfacies) concerns the Terres d’Haurs Formation and corresponds to a ramp profile with the development of shoals. Those shoals locally protect semi-restricted lagoons. Algal mats are also observed. The last part of the work concerns the sedimentary dynamics and proposes sea level variations as the key parameter probably responsible for the succession of these three depositional settings. [less ▲]

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See detailLes Monts de Baileux section: detailed sedimentology and magnetic susceptibility of Hanonet, Trois-Fontaines and Terres d'Haurs formations (Eifelian-Givetian boundary and Lower Givetian, SW Belgium)
Mabille, Cédric ULg; Boulvain, Frédéric ULg

in Geologica Belgica (2008), 11

This work details for the first time the sedimentology of Les Monts de Baileux section. This section, located in a quarry between Chimay and Couvin, exposes a remarkable succession of strata from the top ... [more ▼]

This work details for the first time the sedimentology of Les Monts de Baileux section. This section, located in a quarry between Chimay and Couvin, exposes a remarkable succession of strata from the top of the Jemelle Formation to the base of the Mont d’Haurs Formation. It therefore offers the opportunity to investigate the entire Hanonet, Trois- Fontaines and Terres d’Haurs formations, biostratigraphically from Polygnathus ensensis to P. timorensis conodont zones. This large lithostratigraphic thickness of clayley and argillaceous, and also pure limestones encompasses the Eifelian/ Givetian boundary in the lower part of Hanonet Formation, allowing a better understanding of the transition between the Eifelian which corresponds to a mixed siliciclastic-carbonate detrital ramp and the lower Givetian dominated by a carbonate rimmed shelf-related sedimentation. Petrographic study leads to the definition of 21 microfacies integrated into two palaeogeographical models. The first model (13 microfacies) is proposed for the Jemelle, Hanonet and Trois-Fontaines formations, i.e. P. ensensis Zone and almost entire P. hemiansatus Zone. In this platform model, the fore-reef environment is characterized by a high influence of storm events and carbonate input coming from proximal settings. The reef is mainly composed of an accumulation of stromatoporoids, crinoids, tabulate corals and rugose corals with a peloidal matrix. The back-reef area is dominated by agitated environments and calmer lagoons. Locally, less agitated conditions allow growth of massive and laminar organisms. The second model (6 microfacies) concerns the Terres d’Haurs Formation with the end of P. hemianstus Zone and significant part of the P. timorensis Zone. This ramp model is divided into a mid-ramp characterized by open-marine sedimentation interrupted by storm-related events and an inner ramp composed of ooidal shoals, back-shoal sedimentation and storm related deposits. Two other microfacies are fragmentarily defined for the Mont d’Haurs Formation, within the main P. varcus / P. rhenanus intervals. This unit was affected by strong dolomitization processes, where scarcity of well preserved, primary sedimentary fabrics is not favourable for designing of a microfacies-based model at all. The last part of the work concerns stratigraphic variations of magnetic susceptibility (MS). Values of mass MS of rocks were plotted and juxtaposed with semi-quantitative variation curves of microfacies. According to the prevailing magnitudes of MS, the relationships with two controlling parameters are evaluated: terrigenous influence (using the thin-section data on detrital quartz contents as proxies) and wave agitation (based on microfacies interpretation). The transgressive- regressive evolution of microfacies characteristics are compared with the juxtaposed trends in decreasing-increasing MS magnitudes. Approximately two thirds of this section suggests a good matching of the trends on generalized lithological and magnetic data. It is explained by common presence of clayey/silty impurities of slightly to moderately varying compositions which are greatly evidenced by means of thin-section studies and represent a principal and abundant paramagnetic component. The overall MS magnitudes actually show decreasing trends together with vigorous, eustatically driven sealevel rises. However, the remaining third of intervals in this section shows the rather complex than simple, equivocally or negatively arranged sequence/lithologic and MS stratigraphic trends. [less ▲]

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See detailThe miospores of the Westphalian C / Westphalian D transition in the Campine Basin (Belgium) in the context of the macroflora zonations.
Streel, Maurice ULg; Somers, Y; Dusar, M

in Geologica Belgica (2008), 11(3-4), 243-250

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See detailSedimentology and magnetic susceptibility of the Couvin Formation (Eifelian, South Western Belgium): Carbonate platform initiation in a hostile world
Mabille, Cédric ULg; Boulvain, Frédéric ULg

in Geologica Belgica (2007), 10(1-2), 47-67

The Eifelian of Belgium is mainly characterised by a mixed siliciclastic-carbonate sedimentation on a ramp profile. In this context, the Couvin Formation is the more important and remarkable exception. It ... [more ▼]

The Eifelian of Belgium is mainly characterised by a mixed siliciclastic-carbonate sedimentation on a ramp profile. In this context, the Couvin Formation is the more important and remarkable exception. It represents a carbonate platform initiation in a hostile environment. This work is mainly based on the stratotype, corresponding to two stratigraphic sections located in Couvin, along the southern border of the Dinant Synclinorium. These sections are the Eau Noire and Falaise de l'Abime sections. Unfortunately, they are discontinuous. To allow a better understanding of the sedimentary dynamics, the data are complemented by a shorter but continuous section located in Villers-la-Tour (3.5 km West of Chimay). Petrographic study leads to the definition of 14 microfacies which are integrated in a palaeogeographical model. It corresponds to a platform setting where the reef complex is mainly constituted by an accumulation of crinoids, stromatoporoids and tabulate corals. The microfacies evolution is interpreted in terms of bathymetrical variations. It shows a general shallowing-upward trend encompassing the vertical succession of fore-reef settings, reef development, back-reef and then lagoon environment. This interpretation is supported by trends in mean magnetic susceptibility data, providing a better understanding of the sedimentary dynamics. Moreover, these data show positive correlation with concentrations of detritic minerals, but an inverse relationship with well washed skeletal limestones. The comparison of the three studied sections leads to considerations concerning the lateral variability in the Couvin Formation indicating more agitated conditions in the Abime Member in Villers-le-Tour section. [less ▲]

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See detailPalynomorph distribution and bathymetry in the Chanxhe section (eastern Belgium), reference for the neritic late to latest Famennian transition (Late Devonian).
Maziane-Serraj, N; Hartkopf-Fröder, C; Streel, Maurice ULg et al

in Geologica Belgica (2007), 10(3-4), 170-175

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