References of "Da Silva, Anne-Christine"
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See detailDiversity and correlation of Givetian records in southern Belgium
Pas, Damien ULg; Poulain, Geoffrey; Labaye, Corentin et al

in Berichte des Institutes für Erdwissenschaften der Karl-Franzens-Universität Graz (2014, August), 19

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See detailTassili n’Ajjer (Sahara Oriental Algérien) – Résultats préliminaires sur le Silurien-Dévonien
Djouder, Hocine ULg; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Journée Thématique de l’Association des Sédimentologistes Français (ASF) « Diagenèse : avancées récentes et perspectives » (2014, July)

Les gisements atypiques non-conventionnels, à roches sédimentaires faiblement perméables, ainsi que les « sources rocks » constituent une source pétrolière majeure, attirant de plus en plus l’industrie ... [more ▼]

Les gisements atypiques non-conventionnels, à roches sédimentaires faiblement perméables, ainsi que les « sources rocks » constituent une source pétrolière majeure, attirant de plus en plus l’industrie pétrolière, d’où un regain d’intérêt potentiel au sein du Bassin de Berkine. En effet, rien que les argiles radioactives (‘hot’) shales du Silurien sont à l’origine de 80 à 90% des hydrocarbures de la plaque Nord-africaine, et les argiles radioactives du Frasnien (source secondaire) avec des valeurs de TOC allant jusqu’à 14% (Lüning et al., 2000). L'objectif de la thèse s’agira dans un premier temps de l’analyse des diagraphies de forages (Berkine ‘subsurface’) conditionnée aux données de terrain (Tassili n’Ajjer sur affleurements) et de sismique réflexion. Ceci afin de réaliser la modélisation 2D et 3-D des corps réservoirs et de la roche mère, à l’aide du logiciel Petrel©. Et au final, la cartographie des unités de la série Silurien-Dévonien dans le but de définir les « Plays » potentielles aux futures plans d’exploration. Au second volet, la mise au point d’une méthodologie rigoureuse, permettant l’étude minéralogique et l’évolution diagénétique des faciès, sous différents aspect ; la quantification de la porosité, la définition des relations entre porosité et minéralogie. Ensuite caractériser les argiles radioactives du Llandoverien-Frasnien respectivement Silurien, Dévonien et minéraux associés (Lüning et al., 2004). Plus précisément les processus et mécanismes qui contrôlent les transformations des minéraux argileux (minéralogies et cristallochimies) en composante latérale mais aussi en fonction de la profondeur. Dans ce contexte, des missions de terrains seront entreprises dans les massifs du Fadnoun (Tassili Central), Oued Taïni, Oued Khabkhab ainsi que dans l’Oued Amassine (Tassili Occidental) qui nous permettront de décrire en surface les formations du Siluro-Dévonien (profondément étudiées par : Asses, A., 1987 - Massa, D., 1988 - Bekkouche, D., 1992 – IFP, Sonatrach, Beicip., 1999) qui renferment les argiles radioactives (‘hot’) shales et les niveaux réservoirs, situées à quelques centaines de kilomètres au Nord (Bassin de Berkine), sous 2500 à 3000 m de sédiments. Une première mission de terrain est déjà réalisée, ayant reçu un support financier de la R&D (Séjour de Recherche à l’étranger), ainsi que des facilitées administratives et logistiques respectivement du Ministère de la Culture et de l’office national du parc culturel du Tassili n’Ajjer (patrimoine mondial de l’UNESCO depuis 1982). D’autres missions ultérieures seront à organiser en fonction du planning du déroulement de la thèse. La première mission géologique de terrain a duré un mois sur le Plateau de Fadnoun (Tassili n’Ajjer central). Ceci dans différentes coupes géologique-type des affleurements du Silurien-Dévonien : l’Oued Imihrou, l’Oued Farzal, Gara Tihouririne (sur la route Illizi-Fort Tarat) et Isoutar (Djouder et al., 2014). Durant cette mission terrain nous avons pu assurer la concordance entre les thématiques et objectifs de départ et les réalisés sur terrain, entre autre : 1) la meilleure compréhension de la géométrie des corps sédimentaires, au sein du Plateau de Fadnoun et donc par extension dans le bassin ; 2) la description et l’analyse des faciès, grâce aux affleurements peu connus dans les oueds. Ils permettront une analyse, notamment en termes d’environnements sédimentaires, des formations du Silurien-Dévonien ; 3) application première dans son genre de la susceptibilité magnétique comme nouvel proxy, pour les corrélations lithostratigraphiques des unités du Silurien-Dévonien aux Tassilis. 4) réalisation d’un échantillonnage serré à différents niveaux pour couvrir tout l’intervalle de la dépression intra-Tassilienne et des Grès du Tassili Externe, et puis l’expédition du matériel, nécessaire aux analyses de laboratoires notamment à Liège, et collaborateurs. La confection de lames-minces (en cours) permettra l’étude de la minéralogie et de la pétrographie, et donc une meilleure compréhension des faciès et microfaciès, c’est à dire de leurs propriétés intrinsèques (systèmes hétérogènes et complexes). Les lames palynologiques permettront des datations précises de chaque niveau. Enfin, différentes analyses sur roche (minéraux argileux dans un Laboratoire partenaire de l’Université de Poitiers en France, susceptibilité magnétique, cathodoluminescence, analyses géochimiques des majeurs et des traces à l’ULg) permettront d’affiner les paramètres du paléoenvironnement (Da Silva et al., 2013). [less ▲]

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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 (2014), 103

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 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 detailCarbonate Mounds: from Paradox to World Heritage
Henriet, Jean-Pierre; Hamoumi, N.; Da Silva, Anne-Christine ULg et al

in Marine Geology (2014), 352

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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 detailStromatoporoid diversity and growth in late Wenlock reefs and associated facies (Silurian) at Wenlock Edge, UK.
Kershaw; Da Silva, Anne-Christine ULg

in Lindskog; Mehlqvist (Eds.) Proceedings of the 3rd IGCP 591 Annual Meeting Lund, Sweden, 9–19 June 2013 (2013)

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See detailDepositional facies settings and geochemical proxies of Late Devonian sequences in northwestern Thailand.
Konighsof; Da Silva, Anne-Christine ULg; Suttner et al

in ICPSEA3 2013: The 3rd International Conference on the Palaeontology of South-East Asia. Abstract book (2013)

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See detail) Shallow water facies setting around the Kačák Event – Microfacies, MS studies, and geochemical proxies.
Königshof; Da Silva, Anne-Christine ULg; Suttner et al

in ICPSEA3 2013: The 3rd International Conference on the Palaeontology of South-East Asia. Abstract book (2013)

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See detailDepositional facies settings and geochemical proxies of Late Devonian sequences in northwestern Thailand.
Königshof, Peter; Racki, G.; Savage, N. et al

in ICPSEA3 2013: The 3rd International Conference on the Palaeontology of South-East Asia. Abstract book (2013)

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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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