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See detailMagnetic susceptibility and cyclic arrangements from the late Devonian (Frasnian) Hull platform, Canning Basin, Australia.
Da Silva, Anne-Christine ULg; George, Annette; Chow, Nancy

in Travaux de Geophysiques (2010), XXXIX

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See detailStromatoporoids paleoecology from the Frasnian (Upper Devonian) of Southern Belgium.
Da Silva, Anne-Christine ULg; Kershaw, Stephen; Boulvain, Frédéric ULg

in International Palaeontological Congress, Programme and Abstracts (2010)

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See detailCyclostratigraphic implications of Devonian-climate astronomical forcing.
De Vleeschouwer, David; Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg et al

in Geological Society of America Abstracts with Programs (2010), 42(5), 540

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See detailCenozoic and Devonian carbonate mound systems – comparisons of magnetic susceptibility behaviour between recent and ancient systems.
Da Silva, Anne-Christine ULg; Foubert, Anneleen; De Mol, Ben

in Travaux Géophysiques (2010), XXXIX

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See detailDelta and deep basin Jurassic deposits from Iran: relationship between magnetic susceptibility and facies
Sardar Abadi, Mehrdad ULg; Da Silva, Anne-Christine ULg; Zamanzadeh

in Abstract 4eme Congrès Français de Stratigraphie, Strati2010, Paris, France, 30 Augustus – 2 September (2010)

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See detailMagnetic Susceptibility of Frasnian reefs and mounds from Eastern Belgium.
Demaude, Nicolas; Boulvain, Frédéric ULg; Cornet, Pierre et al

Conference (2010)

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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 detailIGCP 580 - Magnetic susceptibility, correlations and palaeoenvironment.
Da Silva, Anne-Christine ULg; Whalen, Michael; Hladil, Jindrich et al

Conference (2009, September)

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See detailInfluence of sedimentary setting on the use of magnetic susceptibility : examples from the Devonian of Belgium
Da Silva, Anne-Christine ULg; Mabille, Cédric ULg; Boulvain, Frédéric ULg

in Sedimentology (2009), 56

Bulk magnetic susceptibility measurements on sedimentological samples from all geological periods have been used widely in the last two decades for correlations and as a proxy for sea-level variations ... [more ▼]

Bulk magnetic susceptibility measurements on sedimentological samples from all geological periods have been used widely in the last two decades for correlations and as a proxy for sea-level variations. This paper explores the link between magnetic susceptibility, depositional setting and environmental parameters. These environmental parameters include distal–proximal transects, microfacies successions and fourth-order trends on different carbonate platform types (platform, ramp, carbonate mound or atoll) during different Devonian stages (Eifelian, Givetian and Frasnian). Average magnetic susceptibility values over a distal–proximal-trending facies succession vary markedly with depositional setting. On carbonate platforms, average magnetic susceptibility generally increases towards the top of shallowing-upward sequences. On a distal–proximal transect, average magnetic susceptibility is intermediate for the deepest facies, decreases for the reef belts and increases to a maximum in the back-reef zone. In ramps and atolls, magnetic susceptibility trends clearly differ; average magnetic susceptibility generally decreases towards the top of shallowing-upward sequences and is highest in the deepest facies. The strong relationship between magnetic susceptibility, facies and sequences implies a strong environmental influence. However, the different responses in the different latform types suggest that sea-level changes leading to variation in detrital input is not the only parameter controlling average magnetic susceptibility values. Other primary or secondary processes also probably influenced magnetic mineral distribution. Primary processes such as carbonate production and water agitation during deposition are probably key factors. When carbonate production is high, the proportion of magnetic minerals is diluted and the magnetic susceptibility signal decreases. High water agitation during deposition will also selectively remove magnetic minerals and will lead to low average magnetic susceptibility values. These parameters explain the lowest values observed on the reef platform, inner ramp and atoll crown, which are all in areas characterized by higher carbonate production and greater water agitation during deposition. The lowest values observed in the lagoon inside the atoll crown can be related to detrital isolation by the atoll crown. However, other parameters such as biogenic magnetite production or diagenesis can also influence the magnetic signal. Diagenesis can change magnetism by creating or destroying magnetic minerals. However, the influence of diagenesis probably is linked strongly to the primary facies (permeability, amount of clay or organic matter) and probably enhanced the primary signal. The complexity of the signal gives rise to correlation problems between different depositional settings. Thus, while magnetic susceptibility has the potential to be an important correlation tool, the results of this investigation indicate that it cannot be used without consideration of sedimentary processes and depositional environments and without strongbiostratigraphical control. [less ▲]

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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 detailMagnetic susceptibility evolution and sedimentary environments on carbonate platform sediments and atolls, comparison of the Frasnian from Belgium and Alberta, Canada
Da Silva, Anne-Christine ULg; Potma, Ken; Weissenberger, John A. W. et al

in Sedimentary Geology (2009), 214

Magnetic susceptibility (MS) measurements on carbonate rocks are considered as a proxy for impurities delivered to the carbonate environments. In the absence of strong climatic or tectonic variations ... [more ▼]

Magnetic susceptibility (MS) measurements on carbonate rocks are considered as a proxy for impurities delivered to the carbonate environments. In the absence of strong climatic or tectonic variations, bulk MS values have been linked to sea level variations, because sea-level fall increases clastic supply and therefore increases magnetic mineral deposition. In this paper we explore the relationship between the average magnitude of bulk MS, with shallowing-up sequences and facies evolution in different Devonian carbonate complexes. Similarities and differences between these parameters have been scrutinized in carbonate attached platform and detached platforms (mounds and/or atolls) from Belgium and Canada. In the carbonate attached platforms from Belgium and Canada, the MS patterns are directly related to depositional environment. Mean MS values increase from the most distal towards the most proximal facies and towards the top of the majority of fourth-order shallowing-up sequences. These trends are in agreement with theoretical background (MS increases with regression). In the Belgian detached platform, the average MS pattern generally shows an opposite behaviour of that observed in the attached carbonate platforms. Average MS decreases towards the most proximal facies and towards the top of a majority of the fourth-order shallowing-up sequences. This behaviour can be explained by the influence of sedimentary rate and water agitation during deposition. A high sedimentary rate will dilute the magnetic minerals in the atoll facies and the highwater agitation during deposition may be expected to have prevented the deposition of the magnetic grains. So, the combination of these two effects will result in the observed low values in the atoll crown and lagoonal facies. In the Canadian detached platform, MS is mainly negative. This means that the limestones are very pure. The technique does not appear to be appropriate in these rocks. The variations of average MS behaviour by platform type can imply difficulties in correlating carbonates from different settings. A comparison of time equivalent mound and platform deposits shows that after an important regressive surface, the MS values are increasing for the platform deposits and decreasing for the mound. So MS evolution can be in complete opposition (caused by highly different sedimentary rates) in different depositional settings. The MS signal preserved in carbonate rocks is probably mainly related to 1) varying clastic supplies; 2) varying carbonate accumulation rates (dilution of the magnetic minerals by high carbonate production) and 3) potentially diagenesis. [less ▲]

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See detailAnnual report 2009 of the IGCP-580 Project.
Da Silva, Anne-Christine ULg; Whalen, Michael; Hladil, Jindrich et al

Report (2009)

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See detailEtude comparative des modèles sédimentaires et diagénétiques entre les versants nord et sud des Pyrénéens de la plate-forme carbonatée du Paléocène moyen.
Loisy, Corinne; Cerepi, Adrian; Da Silva, Anne-Christine ULg et al

in 12e Congrès Français de Sédimentologie – Rennes 2009 – Livre des résumés, Publ. ASF, n°64 (2009)

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See detailApplication of magnetic susceptibility on Palaeozoic sedimentary rocks
Spassov, Simo; Da Silva, Anne-Christine ULg; Whalen, Michael et al

in Abstract book of the IAGA 11th Scientific assembly (2009)

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See detailcontribution to understanding of sedimentological and diagenetic processus related to a major emersive surface : example of the middle paleocene unconformity (MPU).
Loisy, Corinne; Kiefer-Ollier, Eloise; Cerepi, Adrian et al

in Book of Abstracts - 26th IAS meeting, Alghero, Sardenia (2009)

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