114,576 research outputs found
Nd-Sr-Pb evidence of glacial-interglacial variations in clay provenance and transport in the North Atlantic Ocean.
No full textInternational audienceThe purpose of this study is to characterize palaeoceanographic variations induced by climate changes on the glacial-interglacial time scale. The climatic control of terrigenous clay mineral sedimentation depends on latitudinal and longitudinal distribution of the sediments investigated (Bout-Roumazeilles et al., 1997). The climatic variations affect the intensity of both physical and chemical weathering on the continent and, the transport of clay minerals by wind and marine currents. Clay particules, less than 2 microns, from a series of ODP cores and piston cores from various geographical settings in the North Atlantic and Arctic Oceans, will be used as palaeoceanographi
Truth and untruth: Louis-Ferdinand Céline's Voyage au bout de la nuit and the memory of the Great War 1914-1918
No full textThis thesis examines Louis-Ferdinand Celine’s 1932 novel Voyage au bout de la nuit as a rewriting of his memory of the Great War 1914-1918. It seeks to resolve the truth problematic posed by the inversion in Voyage au bout de la nuit of Celine’s experience in the war, primarily the transition from Celine’s heroism in the war to his fictional self-portrait as the coward, Bardamu. It seeks to clarify the role and value of Celine’s fictional witness to war by placing the novel in a broadly developed context of the war and its commemoration. A major premise of this thesis is that Celine was traumatised by the war and that his rewriting of his war experience is informed by his need to break free of traumatised memory through the creation of a new, literary narrative of his personal past. By drawing on the literature of trauma and survival, as well as on studies of the Great War and other wars, this thesis succeeds in establishing that Celine was, indeed, traumatised by his war experience and succeeds in showing the many ways in which this trauma shapes Voyage. It also provides a thorough account of how Voyage as literary artefact engages with the memory of the Great War and how it functions as witness to war and the consequence of war. It brings us ultimately towards the dynamic of accusation which lies at the heart of Celine’s traumatic memory of the Great War and which underlies its keynotes of irony, satire and invective. This thesis is multi-disciplinary in its approach, drawing on historical, biographical, psychological, and literary studies. It provides an important contribution to Celine studies, but also to studies of the Great War, the memory and literature of the Great War and to studies of twentieth-century trauma, memory and identity
Understanding the Distributions of Benthic Foraminifera in the Adriatic Sea with Gradient Forest and Structural Equation Models
No full textAbstract: In the last three decades, benthic foraminiferal ecology has been intensively investigated to improve the potential application of these marine organisms as proxies of the effects of climate change and other global change phenomena. It is still challenging to define the most important factors
affecting foraminiferal communities and derived faunistic parameters. In this study, we examined the abiotic-biotic relationships of foraminiferal communities in the central-southern area of the Adriatic Sea using modern machine learning techniques. We combined gradient forest (Gf) and structural
equation modeling (SEM) to test hypotheses about determinants of benthic foraminiferal assemblages.
These approaches helped determine the relative effect of sizes of different environmental variables responsible for shaping living foraminiferal distributions. Four major faunal turnovers (at 13–28 m, 29–58 m, 59–215 m, and >215 m) were identified along a large bathymetric gradient (13–703 m water depth) that reflected the classical bathymetric distribution of benthic communities. Sand and organic matter (OM) contents were identified as the most relevant factors influencing the distribution of foraminifera either along the entire depth gradient or at selected bathymetric ranges. The SEM supported causal hypotheses that focused the factors that shaped assemblages at each bathymetric range, and the most notable causal relationships were direct effects of depth and indirect effects of the Gf-identified environmental parameters (i.e., sand, pollution load Index–PLI, organic matter–OM and total nitrogen–N) on foraminifera infauna and diversity. These results are relevant to understanding the basic ecology and conservation of foraminiferal communitie
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
High resolution study of the deep-water Southern Ocean circulation during the last climatic cycle using geochemical and mineralogical proxies in marine sediments: implication for the CO2 cycle
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
RECONSTRUCTING EARLIEST DIAGENESIS CONDITION USING SEDIMENTO LOGICAL AND GEOCHEMICAL CHARACTERISTICS OF GLAUCONITES . APPLICATION TO LIMESTONEMARLSTONE ALTERNATION IN THE BOULONNAIS
No full textInternational audienceSome of the geological formations of Upper Jurassic and Cretaceous age in the Boulonnais area (Strait of Pas-de-Calais, English Channel) show levels relatively rich in glauconite (a few weight% to 44 wt%). Recent works have shown that glauconite could have formed during (very) early diagenesis; this authigenic phyllosilicate could have thus witnessed the chemical conditions prevailing at the sediment-water interface or a short distance below it. This can be of particular interest in the case of the Assises de Croï Formation showing alternating carbonate beds and marly beds. The beds are of early diagenetic origin and contain populations of glauconite grains which formed even earlier. Glauconite can therefore be considered here as the privileged proxy to the sediment-water interface conditions during the development of the limestone-marl alternation, which is a common pattern in the sedimentary record worldwide. Glauconite was observed from the perspective of its chemical composition (including REE) as well as that of the particle size distribution. The results show that, if redox-proxying trace elements such as V, As, Ge can reflect the redox status of the conditions in which glauconite was formed, this is not the case for REE. The only parameter linked to REE which provides paleoenvironmental indications here is ∑REE, being negatively correlated with the sedimentation rate. It is suggested that REE were all the more incorporated to glauconite when the sedimentation rate was low, but without any appreciable fractionation among REE. Concerning the limestone/marl alternation, our results show that its development is linked neither to variations in redox conditions nor to hydrodynamic changes of the depositional environment. This is a diagenetic phenomenon, the cause of which remains to be determined. Finally, a relationship could be highlighted between the sedimentation rate and the size of the glauconite grains grown in situ.Les formations géologiques du Jurassique supérieur et du Crétacé du Boulonnais (détroit du Pas-de-Calais) peuvent présenter des teneurs notables en grain de glauconite (de quelques % pondéraux à 44 %). Des travaux récents ont montré que cette glauconite s'est formée au cours de la diagenèse (très) précoce ; ce phyllosilicate authigénique aurait ainsi pu être le témoin des conditions paléo-environnementales -en particulier, chimiques -régnant à l'interface eau-sédiment ou à une courte distance au-dessous. Ceci peut être particulièrement intéressant dans le cas des Assises de Croï présentant une alternance de bancs carbonatés et d'interbancs marneux. Les bancs carbonatés sont d'origine diagénétique précoce et contiennent des populations de grains de glauconite qui se sont formés encore plus tôt. La glauconite peut donc être considérée ici comme l'indicateur privilégié des conditions d'interface eau-sédiment lors du développement de l'alternance calcaire-marne, qui est un faciès commun dans les archives sédimentaires mondiales. La glauconite a été observée du point de vue de sa composition chimique (y compris les Terres Rares) ainsi que de celui de la distribution de la taille des particules. Les résultats montrent que, si des éléments-traces tels que V, As, Ge peuvent refléter le statut redox des conditions dans lesquelles la glauconite s'est formée, ce n'est pas le cas pour les TerresRares. Le seul paramètre lié aux Terres Rares qui fournisse ici des indications paléoenvironnementales est ∑REE, qui est manifestement lié à la vitesse de sédimentation. Il est suggéré que les Terres Rares étaient d'autant plus incorporées à la glauconite que le taux de sédimentation était faible, mais sans fractionnement visible au sein des Terres Rares elles-mêmes. Par ailleurs, concernant les alternances, nos résultats montrent que leur évolution n'est liée ni aux variations des conditions redox ni à celles de l'hydrodynamique du milieu de dépôt. Il s'agit d'un phénomène principalement diagénétique dont la cause reste à déterminer (la condensation sédimentaire est une cause probable ; J. -F. Deconinck, communication personnelle, 2024). Enfin, une relation a pu être mise en évidence entre la vitesse de sédimentation et la taille des grains de glauconite développés in situ : une relative condensation sédimentaire accompagne une augmentation de la taille des grains de glauconite. Au total, les grains de glauconite peuvent avoir une vraie valeur d'indicateur paléo-environnemental, à condition que leurs conditions de formation aient été bien définies.</div
Rectobuntonia miranda and Krithe keyi relative abundances and clay mineral and grain-size analysis at sites in the Gulf of Cadiz
No full textThe present dataset comprises micropaleontological and sedimentological analyses on cores MD99-2337 (598 mbsl), IODP U1390 (992 mbsl), and CADKS24 (1,316 mbsl). These cores, collected as part of the oceanographic expeditions IMAGES-V/GINNA (1999), Integrated Ocean Drilling Program (IODP) Expedition 339 (2011-2012), and CADISAR 1 (2004), respectively, are distributed along a bathymetric transect from 600 to 1300 water depth. This study specifically addresses changes in Mediterranean Outflow (MOW) paleo-depths and paleo-velocities in the Gulf of Cadiz using independent and complementary proxies, ostracod species from Mediterranean origin, clay mineral associations and grain-size analysis. The here presented data comprises: ostracod abundances in valves per gram, Rectobuntonia miranda and Krithe keyi relative abundances in %, clay mineral assemblages in %, cohesive fine particles measuring less than 10 µm in %, and sortable silt in µm
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Reunion specialisee ASF-SGF. Signification de la presence d'interstratifies illite/vermiculite dans les sediments pleistocenes de l'ocean Atlantique nord. "Argiles: Sedimentologie, diagenese, environnement" .
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