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Inproceedings Reference Time-series analysis of SAR images for detection of ground subsidence in the Scheldt estuary
Located in Library / RBINS Staff Publications
Inproceedings Reference audio/x-realaudio Time-series analysis of SAR images for detecting ground subsidence in the Scheldt estuary
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference Tintigny: A Polymict Eucrite from Belgium
Located in Library / RBINS Staff Publications 2024
Inproceedings Reference Tintigny: A Polymict Eucrite from Belgium
In February 1971, a meteorite fell on the roof of a barn belonging to Mr. E. Schmitz in Tintigny, a village in southern Belgium. Upon its recovery, its meteoritic origin was confirmed by the schoolteacher, Mr. A. Rossignon who then looked after the sample. In 2017, for the first time, the meteorite was given to specialists for a detailed examina-tion and classification. We used various analytical techniques to characterize its mineralogy, elemental, and isotopic composition. Based on the obtained data, we classified it as a polymict eucrite, a meteorite originating from 4 Vesta, and named it Tintigny [1]. Tintigny is partly covered by shiny black fusion crust. Its interior mainly exhibits a light grey color and shows a brecciated texture composed of a fine-grained matrix, hosting darker crystals and cm-sized dark grey clasts. Under the microscope, a brecciated sub-ophitic basaltic texture mainly composed of plagioclase/maskelynite and clinopy-roxene is dominant. In addition to the dominant sub-ophitic texture, at least three distinct textures exposed in clasts are observable. At least two generations of shock effects (such as fractures), are present in the sample: those limited to clasts and large crystals, and those that crosscut both the large grains and the matrix. The accessory minerals include troilite, ilmenite, chromite, FeNi metal, and silica. Mineral chemistry calculations of pyroxene end-members show ranges from 8.5 to 60.7 mol% for enstatite, 30.1–70.0 mol% for ferrosilite, and 2.6–38.4 mol% for wollastonite. Based on these values, most pyroxenes in Tintigny are pigeonite and augite [2]. The Fe/Mn ratios of pyroxenes range from 27.1 to 39.3, with the highest ratio observed in pyroxene from the symplectitic clast. Fe/Mn and Fe/Mg ratios in low-Ca pyroxene (Wo<10) are 30.2±4.4 and 0.8±0.3, respectively. These ratios in high-Ca pyroxene (n=8) are 34.3±3.7 for Fe/Mn and 2.6±2.4 for Fe/Mg. The average pyroxene Fe/Mn ratio for all pyroxene is 32.5±4.4 (SD, n=14). Fe/Mg ranges from 0.6 to 8.2, with an average value of 1.8±2.0 (SD, n±14). Considering pyroxene Fe/Mn ranges of 40±11, 62±18, 32±6, and 30±2 for basaltic rocks from the Earth, Moon, Mars, and 4 Vesta (eucrites), respectively, and based on our data, particularly those of low-Ca py-roxene, Tintigny falls in the range of basaltic eucrites [3]. The bulk rock Fe/Mn and Fe/Mg ratios of Tintigny are 33.9 and 3.1, respectively. These values overlap with those measured for howardite-eucrite-diogenite (HED) and martian meteorites [4]. With a Ga/Al ratio of 4.17×10-5, Tintigny falls within the range of those of eucrites. Using the CI-normalized elemental concentration, we can see strong simi-larities between Tintigny and noncumulate eucrites, which is also reflected based on the abundance of TiO2 (0.63) and FeO/MgO ratio (2.66) in Tintigny. The bulk oxygen isotopic composition of Tintigny, as determined by laser fluorination, is also consistent with it being an HED (δ17O=1.72±0.04 ‰; δ18O=3.76±0.08‰; Δ17O=-0.25±0.01 ‰ (n=2, errors 2SD)), with a composition that plots close to the Eucrite Fractionation Line [5]. Based on the Meteoritical Bulletin Database, only 70 HED falls have been reported so far. Including Tintigny, only 39 eucrite falls are known to date, 11 of them occurred in Europe, with Tintigny being the only one from Belgium. In addition to the scientific importance of studying a eucrite fall like Tintigny, we emphasize the significance of the discovery of a historical meteorite fall by drawing attention to national scientific heritage that must be properly un-derstood and safeguarded for generations of scientists, scholars, and amateurs to come. Nowadays, together with four other meteorites from Belgium (Hautes Fagnes LL5, Lesves L6, St. Denis Westrem L6, and Tourinnes-la-Grosse L6), the Tintigny achondrite is exhibited in the meteorite gallery of the Institute of Nat-ural Sciences in Brussels and is open to the public for visits.
Located in Library / RBINS Staff Publications 2024
Inproceedings Reference To colour or not to colour: Colour patterns and pigments in Invertebrates from the Palaeozoic of Belgium.
Almost nothing is known about the evolution of shell colour in invertebrates. This is largely due to the ultra-rarity of fossils in which colour patterns and pigments are preserved and immediately visible, and therefore easy to identify, especially when these are hundreds of millions of years old. This hampers our understanding of the role and function of colour in extinct animals, their ecology, mode of life, interactions, development, and evolution. A good example for this ultra-rarity is the Palaeozoic of Belgium, world-renowned for its exquisitely preserved fossils of the Devonian and Carboniferous, enabling to document major transitions in ecosystem dynamics and the evolution of life on Earth (e.g. nekton revolution, terrestrialisation, major climate changes, anoxic events, biodiversity crises) but from which only a few cephalopod, bivalve and gastropod mollusc and brachiopod shells were historically documented preserving coloured traces (mostly by L.-G. de Koninck and P. de Ryckholt, mid to late 19th century). However, recently, it was discovered that many more specimens preserve these traces, in particular those from Tournaisian–Viséan shallow marine reef environments, allowing to investigate its occurrence in different evolutionary lineages of marine invertebrates exactly during one of the main periods of revolution in geologic history. In Brain project B2/P233/P2 nicknamed COLOURINPALAEO financed by Belspo, after gathering all the specimens available in the main Belgian collections, we will use different techniques (multispectral photogrammetry and spectro-imaging) to better visualise the preserved colour patterns and pigments. Furthermore, advanced spectroscopic techniques, namely Raman micro-probe spectroscopy, synchrotron trace elemental mapping and absorption spectroscopy, will be used to identify the chemical signature of the pigments as well as their mode and pathways of preservation. Some of the first results on this multidisciplinary study on a unique set of Belgian fossils will be presented.
Located in Library / RBINS Staff Publications 2024
Inproceedings Reference To colour or not to colour: colour patterns and pigments in invertebrates from the Palaeozoic of Belgium
Almost nothing is known about the evolution of shell colour in invertebrates. This is largely due to the ultra-rarity of fossils in which colour patterns and pigments are preserved and immediately visible, and therefore easy to identify, especially when these are hundreds of millions of years old. This hampers our understanding of the role and function of colour in extinct animals, their ecology, mode of life, interactions, development, and evolution. A good example for this ultra-rarity is the Palaeozoic of Belgium, world-renowned for its exquisitely preserved fossils of the Devonian and Carboniferous, enabling to document major transitions in ecosystem dynamics and the evolution of life on Earth (e.g. nekton revolution, terrestrialisation, major climate changes, anoxic events, biodiversity crises) but from which only a few cephalopod, bivalve and gastropod mollusc and brachiopod shells were historically documented preserving coloured traces (mostly by L.-G. de Koninck and P. de Ryckholt, mid to late 19th century). However, recently, it was discovered that many more specimens preserve these traces, in particular those from Tournaisian–Viséan shallow marine reef environments, allowing to investigate its occurrence in different evolutionary lineages of marine invertebrates exactly during one of the main periods of revolution in geologic history. In Brain project B2/P233/P2 nicknamed COLOURINPALAEO financed by Belspo, after gathering all the specimens available in the main Belgian collections, we use different techniques (multispectral photogrammetry and spectro-imaging) to better visualise the preserved colour patterns and pigments. Furthermore, advanced spectroscopic techniques, namely Raman micro-probe spectroscopy, synchrotron trace elemental mapping and absorption spectroscopy, are used to identify the chemical signature of the pigments as well as their mode and pathways of preservation. Some of the first results on this multidisciplinary study on a unique set of Belgian fossils will be presented.
Located in Library / RBINS Staff Publications 2024
Article Reference Toarcian marine reptiles from Luxembourg. In : Les schistes bitumineux
Located in Library / RBINS Staff Publications 2016
Proceedings Reference Tools to support the monitoring of MSFD descriptors 6 'Sea-floor integrity' and 7 'Hydrographical conditions'
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference Toujours dans l’Ouest de l’Inde: une nouvelle faune de mammifères de l’Eocène inférieur dans la mine de lignite de Tadkeshwar
Les mines de lignite de Vastan et Mangrol au Gujarat (ouest de l’Inde) ont livré une riche faune de vertébrés de l’Yprésien dont une proportion importante de mammifères de petite à moyenne taille d’affinité européenne. Nous présentons ici un nouvel assemblage contemporain issu de la mine voisine de Tadkeshwar. Deux couches fossilifères y ont été découvertes. La première est représentée par un chenal de sables argileux gris situé quelques mètres au-dessus du niveau de lignite inférieur de la mine. La seconde est représentée par un niveau lenticulaire de silts argileux foncés, ligniteux et riche en restes organiques, situé juste sous le niveau de lignite supérieur. Cette dernière couche est sédimentologiquement semblable aux célèbres lentilles fossilifères de Vastan. Ces deux niveaux à fossiles ont livrées une faune de mammifères similaire à celle de Vastan avec la présence du cambaytheriidé Cambaytherium thewissi, groupe frère des périssodactyles, des primates adapoïdes Marcgodinotius indicus et Asiadapis cambayensis, et du hyaenodontidé Indohyaenodon raoi. La présence de ces espèces dans les deux mines et dans différentes couches stratigraphiques suggère que les dépôts entre les deux niveaux à lignites représentent un seul et même âge à mammifères. Hormis les espèces classiques mentionnées ci-dessus, deux nouvelles espèces sont présentes. Un nouveau petit cambaytheriidé abondant est décrit sur base de mâchoires supérieures et inférieures, de nombreuses dents isolées et d’os postcrâniens. Un nouveau tillodonte esthonychidé est nommé sur base d’un dentaire avec m3 et d’incisives et molaires inférieures et supérieures isolées. Cette nouvelle faune de Tadkeshwar recèle également les premiers grands vertébrés de l’Eocène inférieur de l’Inde tels qu’un mammifère pantodonte appartenant probablement aux coryphodontidés, un crocodiliforme dyrosauridé et un serpent madtsoiidé géant. Parmi les vertébrés de Tadkeshwar plusieurs taxons sont d’affinité gondwanienne indiquant que l’Eocène inférieur était une période cruciale en Inde durant laquelle des taxons laurasiens d’affinité européenne coexistèrent avec des taxons reliques du Gondwana avant la collision avec l’Asie. Le travail de terrain est financé par la National Geographic Society, la Fondation Leakey et le Wadia Institute of Himalayan Geology. Ce résumé est une contribution au projet BR/121/A3/PalEurafrica financé par la Politique Scientifique Belge.
Located in Library / RBINS Staff Publications 2016
Article Reference Tournaisian and Viséan (Carboniferous) brachiopods from neptunian dykes of the Harz Mountains (Germany)
Located in Library / RBINS Staff Publications 2019