References of "Boulvain, Frédéric"
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See detailUnderstanding of the diversity of earthquake turbiditic flows in a single lake: the case of the Lake Hazar on the East Anatolian Fault
Lamair, Laura ULg; Hage, Sophie ULg; Hubert, Aurelia ULg et al

Poster (2014, August)

The East Anatolian Fault (EAF) is a major left-lateral strike-slip fault accommodating with the conjugate North Anatolian Fault the westward extrusion of the Anatolian Plate away from the Arabia-Eurasia ... [more ▼]

The East Anatolian Fault (EAF) is a major left-lateral strike-slip fault accommodating with the conjugate North Anatolian Fault the westward extrusion of the Anatolian Plate away from the Arabia-Eurasia collision zone. The East Anatolian Fault ruptured over most of its length during the 19th century in a series of magnitude ~7 earthquakes. During the 20th century this fault was less active with only two events of magnitude greater than 6. This absence of large earthquakes has resulted in relatively little attention being paid to the East Anatolian Fault compared to the North Anatolian Fault, which has ruptured during the last century in several earthquakes of Ms~7. To constrain the seismic history of the East Anatolian Fault in its central part, we focus on the Hazar Lake, occupying a 20 km long pull-apart basin. Short cores and long sedimentary cores were collected at three different sites to retrieve a paleoseismic record. Small correlative coarse-grained sedimentary events are identified in all cores. The age of the events is inferred combining radiocarbon and radionuclide (137 Cs and 210Pb) dating. We present here detailed analyses of three sedimentary events assigned respectively to the historical earthquakes occurring in 1789, 1513-1514, 1285. The source of the sedimentary events is different at the three sites. We combine X-ray imagery, magnetic susceptibility, grain-size and XRF measurements with thin section analysis to investigate the nature of sedimentary events. The analyses show first that the three sedimentary events are different. The magnitude of the terrigenous signal varies significantly. Second the correlative events have a different expression at the three sites. So each site has a different and specific sensitivity. In particular, an individual event can be composed of several coarse-grained sub-events of different magnitude with a time lapse in between greater than a week. The latter is reveals by the presence of bioturbation in particular by chironomids in individual thin sand layers. Thin section also shows that subevents are gradded. Each coarse-grained layer is thus a separated turbiditic flow. The site with the highest sensitivity is the one located near the near-shore steep submarine southern slopes overhanged by the steep subaerial slopes of the Hazar Mountains. The rivers draining the Hazar Mountains are ephemeral and provide a restricted sedimentary supply. In addition, seismic reflection data show that the submarine slopes do not to accumulate a significant sedimentary load. However on these steep slopes, an earthquake intensity of 6 or less is enough to trigger a slope failure and the associated turbiditic flow. We conclude that the different sub-events at this site may record a complete earthquake sequence, i.e the main-shock and its foreshocks and aftershocks. [less ▲]

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See detailBelgian mud mounds, facies and structure and stromatoporoid fauna
Da Silva, Anne-Christine ULg; Kershaw, S.; Boulvain, Frédéric ULg et al

in Wesenberg Lauridsen, b.; Bjerager, M. (Eds.) Cold water carbonates at high paleolatitudes from the Palaeozoic to the Reent – combining outcrops studies with core studies and geophysical imaging. Programme and abstract book (2014)

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See detailEsquisse géologique du bassin de la Basse Lesse
Boulvain, Frédéric ULg

in Atlas du karst wallon: bassin de la Basse Lesse (2014)

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See detailSEDIMENTARY DEVELOPMENT AND MAGNETIC SUSCEPTIBILITY OF THE FRASNIAN CARBONATE PLATFORM IN WESTERN BELGIUM (DINANT SYNCLINORIUM, LA THURE SECTION)
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Labaye, Corentin et al

in 14 ième ASF 2013 (Association des Sédimentologistes Français) (2013, November 07)

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See detailDEPOSITIONAL ENVIRONMENT OF THE EARLY FRASNIAN TO EARLY FAMENNIAN SLOPE DEPOSITS OF MOUNT FREIKOFEL (CARNIC ALPS, AUSTRIA/ITALY)
Pas, Damien ULg; Da Silva, Anne-Christine ULg; suttner, Thomas et al

in 14 ième ASF 2013 (Association des Sédimentologistes Français) (2013, November)

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See detailSedimentary development of a continuous Middle Devonian to Mississippian section from the fore-reef fringe of the Brilon Reef Complex (Rheinisches Scheifergebirge, germany)
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Cornet, Pierre et al

in Facies (2013), 59

The Brilon-reef complex is one of the biggest Devonian carbonate buildups (~80 km²) of the Rheinisches Schiefergebirge. The Burgberg section is located in the south-eastern fore-reef area of the Brilon ... [more ▼]

The Brilon-reef complex is one of the biggest Devonian carbonate buildups (~80 km²) of the Rheinisches Schiefergebirge. The Burgberg section is located in the south-eastern fore-reef area of the Brilon reef-complex and exposes a succession of strata (117 m thick) which extend from the Middle Givetian (middle varcus conodont Zone) to the Viséan (bilineatus conodont Zone). Field and microfacies observations led to the definition of nine microfacies which are integrated into a sedimentary model divided into off-reef, intermediate fore-reef and proximal fore-reef sedimentary domains (SD). The off-reef domain (SD1) is the most distal setting observed and is characterized by fine-grained sediments, dominated by pelagic biota and the local occurrence of gravity-flow deposits. The intermediate fore-reef (SD2) is characterized by a mixture of biota and sediments coming from both, deeper-water and shallow-water sources and is influenced by storm and gravity-flow currents. In this domain Renalcis mound-like structures developed locally. Finally, the proximal fore-reef (SD3) corresponds to the most proximal setting which is strongly influenced by gravity-flow currents derived from the Brilon reef-complex. The temporal evolution of microfacies in the fore-reef setting of the Burgberg section show five main palaeoenvironmental trends influenced by the onset, general development, and demise/drowning of the Brilon reef-complex. Fore-reef to off-reef lithologies and their temporal changes are from the base to the top of the section: (U1) - fine-grained sediments with large reef debris, corresponding to the initial development of the reef building upon submarine volcanoclastic deposits during the Middle Givetian (middle varcus Zone) and first export of reef debris in the fore-reef setting; (U2) - high increase of reef-derived material in the fore-reef area, corresponding to a significant progradation of the reef from the Middle Givetian to the Early Frasnian (maximum extension of the Brilon reef-complex to the south, disparilis to the falsiovalis conodont biozones); (U3) - progressive decrease of shallow-water derived material and increase of fine-grained sediments and deep-water biota into the fore-reef setting, corresponding to the stepwise withdrawal of the reef influence; from the Middle to the Late Frasnian (jamieae conodont Zone); (U4) - development of a submarine rise characterized by nodular and cephalopod-bearing limestones extending from the Late Frasnian to the Late Famennian corresponding to the demise and drowning of the Brilon reef-complex as a result of the Late Frasnian Kellwasser events (upper rhenana and triangularis conodont biozones); (U5) - significant deepening of the Burgberg area starting in the Late Famennian, directly followed by an aggrading trend marked by pelagic shales overlying the nodular limestone deposits. [less ▲]

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See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in American Geophysical Union Fall Meeting, Abstract (2013)

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See detailFirst record of Demosponge spicules in a late Devonian stromatoporoid basal skeleton (Frasnian, Belgium).
Reitner; Da Silva, Anne-Christine ULg; Kershaw et al

in Abstracts: Ninth world sponge conference 2013 (2013)

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See detailInsight into the development of a carbonate platform through a multi-disciplinary approach - A case study from the Upper Devonian slope deposits of Mount Freikofel (Carnic Alps, Austria/Italy)
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Suttner, Thomas et al

in International Journal of Earth Sciences (2013)

The development and behavior of Million year-scaled depositional sequences recorded within Palaeozoic carbonate platform has remained poorly examined. Therefore, the understanding of palaeoenvironmental ... [more ▼]

The development and behavior of Million year-scaled depositional sequences recorded within Palaeozoic carbonate platform has remained poorly examined. Therefore, the understanding of palaeoenvironmental changes that occur in geological past is still limited. We herein undertake a multi-disciplinary approach (sedimentology, conodont biostratigraphy, magnetic susceptibility and geochemistry) of a long-term succession in the Carnic Alps which offers new insights into the peculiar evolution of one of the best example of Palaeozoic carbonate platform in Europe. The Freikofel section, located in the central part of the Carnic Alps represents an outstanding succession in a fore-reef setting, extending from the latest Givetian (indet. falsiovalis conodont Zones) to the early Famennian (Lower crepida conodont Zone). Sedimentological analysis allowed to propose a sedimentary model dominated by distal slope and fore-reef slope deposits. The most distal setting is characterized by an autochthonous pelagic sedimentation showing local occurrence of thin-bedded turbiditic deposits. In the fore-reef slope, in a more proximal setting, there is an accumulation of various autochthonous and allochthonous fine- to coarse-grained sediments originated from the interplay of gravity-flow currents derived from the shallow-water and deeper-water area. The temporal evolution of microfacies in the Freikofel section evolves in two main steps corresponding to the Freikofel (Unit 1) and the Pal (Unit 2) Limestones. Distal slope to fore-reef lithologies and associate changes are from base to top of the section: (U1) thick bedded litho- and bioclastic breccia beds with local fining upward sequence and fine-grained mudstone intercalations corresponding, in the fore-reef setting, to the dismantlement of the Eifelian – Frasnian carbonate platform during the early to late Frasnian time (falsiovalis to rhenana superzones) with one of the causes being the Late Givetian major rift pulse; (U2) occurrence of thin-bedded red nodular and cephalopod-bearing limestones with local lithoclastic grainstone intercalations corresponding to a significant deepening of the area and the progressive withdrawal of sedimentary influxes toward the basin, in relation with late Frasnian sea-level rise. Magnetic susceptibility and geochemical analyses were also performed along the Freikofel section and demonstrate the inherent-parallel link existing between variation in magnetic susceptibility values and proxy for terrestrial input. Interpretation of magnetic susceptibility in term of palaeoenvironmental processes reflect that even though distality remains the major parameter influencing magnetic susceptibility values, carbonate production and water agitation also play an important role. [less ▲]

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See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques: a window on the Paleozoic world, Abstract book (2013)

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See detailSpicules or no spicules in Devonian stromatoporoids, that’s the question?
Da Silva, Anne-Christine ULg; Kershaw; Boulvain, Frédéric ULg et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques : a window on the Paleozoic world, Abstract book (2013)

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See detailVoyage au Centre de la Terre
Boulvain, Frédéric ULg; Vander Auwera, Jacqueline ULg

Book published by Académie royale de Belgique (2013)

L’intérieur de notre planète a toujours été une source d’effroi ou de fascination. Ceci d’autant plus que l’observation directe ne permet d’accéder qu’à moins de 1/500 de son rayon ! Notre connaissance de ... [more ▼]

L’intérieur de notre planète a toujours été une source d’effroi ou de fascination. Ceci d’autant plus que l’observation directe ne permet d’accéder qu’à moins de 1/500 de son rayon ! Notre connaissance de l’intérieur de la Terre provient donc soit de mesures géophysiques effectuées lors des séismes, soit d’expériences de cristallisation de minéraux sous des pressions et températures contrôlées, soit encore de l’observation de certaines météorites, censées représenter des fragments de l’intérieur d’une planète semblable à la nôtre. Après avoir abordé, via la tectonique des plaques, la composition et le fonctionnement de la croûte superficielle de notre planète, sa structure interne (manteau, noyau) est envisagée. Enfin, quelques informations quant au magnétisme terrestre permettent de comprendre son origine et son utilisation en tant que marqueur de la mobilité continentale. [less ▲]

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See detailGéologie générale. Du minéral aux géosphères
Boulvain, Frédéric ULg

Book published by Ellipses Edition Marketing SA (2013)

Ce livre introductif de géologie a pour but de mettre à la disposition du lecteur les bases essentielles à l’étude des Sciences de la Terre. Il part des minéraux pour aboutir à la Terre, en faisant ... [more ▼]

Ce livre introductif de géologie a pour but de mettre à la disposition du lecteur les bases essentielles à l’étude des Sciences de la Terre. Il part des minéraux pour aboutir à la Terre, en faisant intervenir une notion d’échelle et de complexité croissantes. Après une introduction et un bref historique, il explicite les propriétés des cristaux et des minéraux ainsi que leur répartition en familles. Les mécanismes aboutissant à la genèse des grands types de roches sont discutés, ce qui permet d’amorcer une réflexion sur les classifications et le cycle géologique. Les chapitres suivants sont consacrés successivement aux processus et aux roches magmatiques, à leur classification, occurrence et genèse en relation avec la tectonique des plaques ; aux principaux processus sédimentaires et aux familles de roches qui leur sont associées et enfin, aux roches et aux différents facteurs du métamorphisme. L’ouvrage se poursuit par un chapitre de synthèse mettant en perspective la formation des bassins sédimentaires et leur évolution au cours du temps, pour aboutir au développement des chaînes de montagnes. La Terre dans son ensemble fait l’objet du chapitre suivant: son anatomie est déduite des mesures géophysiques et des analogies avec les météorites. Cette approche globale se termine par une introduction aux cycles géochimiques. Après avoir évoqué le problème de la mesure du temps en géologie, un bref tableau de l’histoire de notre planète et de la vie qu’elle abrite est esquissé. Enfin, le dernier chapitre est consacré aux relations entre la Terre et l’humanité, dans l’optique des géoressources mais aussi des géorisques. Ce livre s’adresse aux étudiants en Sciences de la Terre ainsi qu’aux étudiants d’autres disciplines abordant ce type de matière dans leur cursus. Il intéressera également le curieux disposant d’un bagage scientifique général, désirant comprendre ce que nous enseignent les roches sur le passé et le présent de notre planète. [less ▲]

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