Search results for "Geochemistry"
showing 10 items of 2967 documents
Zinc isotopes in Late Pleistocene fossil teeth from a Southeast Asian cave setting preserve paleodietary information
2020
Significance Dietary habits, especially meat consumption, represent a key aspect in the behavior and evolution of fossil hominin species. Here, we explore zinc (Zn) isotope ratios in tooth enamel of fossil mammals. We show discrimination between different trophic levels and demonstrate that Zn isotopes could prove useful in paleodietary studies of fossil hominin, or other mammalian species, to assess their consumption of animal versus plant resources. We also demonstrate the high preservation potential of pristine diet-related Zn isotope ratios, even under tropical conditions with poor collagen preservation, such as the studied depositional context in Southeast Asia. However, assessing the …
Atlas historique et technique de la pierre à bâtir bourguignonne. Plateforme numérique mutualiste sur la nature et l’usage de la pierre
2011
L'objectif de cet atlas est de déterminer les arguments environnementaux qui ont défini la Bourgogne comme une région novatrice et influente dans le domaine de l'histoire de l'art et de l'architecture. La Bourgogne possède une identité fortement marquée par les arts de la construction et de la statuaire. Les ressources géologiques exploitables sont nombreuses et variées. Ces aspects font l'objet d'attentions particulières et complémentaires, tant de la part des chercheurs (archéologues, historiens, géologues) que de celles des professionnels de la filière " pierre " et de la gestion du patrimoine. La prise en compte de cet intérêt commun est l'un des points forts du projet...
La mission archéologique de Jebel Oust, site antique de Tunisie
2010
Presentation generale du site Le site antique appele « Jebel Oust » est situe a Hammam el-Oust, a 32 km au sud-ouest de Tunis, sur la route de Zaghouan. Il occupe la pente orientale du Jebel Oust, entre une source chaude (sur laquelle est construit un temple) et un secteur thermal equipe de deux portiques, donnant sur une residence. Le temple, la source et les thermes ont ete a l’origine du site, qui n’a sans doute jamais ete une agglomeration, mais plutot un lieu de culte associe a une sourc...
Approche interdisciplinaire d’un atelier minéralurgique du XVe s à Sainte-Marie aux-Mines (Haut-Rhin, France)
2019
International audience
Anza palaeoichnological site, Late Cretaceous, Morocco. Part III: Comparison between traditional and photogrammetric records
2020
11 pages; International audience; The present study evaluates a methodological workflow that could identify dinosaur tracks and trackways more comprehensively at outcrop scale. The approach described here is based both on 3D modelling by photogrammetry at different resolutions, and on suitably processed digital elevation models (DEMs). The ichnosite of Anza, Morocco, was chosen to demonstrate the efficiency of the proposed pipeline, because 323 dinosaur and pterosaur tracks discovered there have already been published. One subsector containing 89 tracks, identified in the two companion works that followed a traditional approach, was selected and divided into four subzones. By combining diff…
Melting of sediments in the deep mantle produces saline fluid inclusions in diamonds.
2019
We demonstrate the formation of highly saline mantle fluids by the reaction of subducted sediment with peridotite.
Fractal dimension versus density of built-up surfaces in the periphery of Brussels
2007
International audience; This paper aims at showing the usefulness of the fractal dimension for characterizing the spatial structure of the built-up surfaces within the periurban fringe. We first discuss our methodology and expectations in terms of operationality of the fractal dimension theoretically and geometrically. An empirical analysis is then performed on the southern periphery of Brussels (Brabant Wallon). The empirical analysis is divided into two parts: first, the effect of the size and shape of the windows on the fractal measures is empirically evaluated; this leads to a methodological discussion about the importance of the scale of analysis as well as the real sense of fractality…
Cinq millénaires de métallurgie en montagne basque. Les apports d'une démarche intégrée alliant palynologie et géochimie isotopique du plomb
2001
Five thousand years of metallurgy in the basque mountains : the contributions of an integrated process mixing palynology and the isotopic chemistry of lead. An interdisciplinary research combining palyno- logy and lead isotopic geochemistry was performed in a peat bog of the Basque Country, in an area recognized as being an old metallurgical centre. These various analyses make it possible to reconstitute mining and metallurgical activities and to appreciate the impact on forest during last five millennia. Several phases are attested between late Neolithic and modern times (Middle Bronze age, Late Bronze age, Antiquity and finally modern time). Most of these phases are clearly related to for…
Deux frères scientifiques de renom : Fernand et Robert de Montessus de Ballore
2011
National audience; Le premier des deux frères, Fernand " Bernard de Montessus de Ballore ", est l'un des précurseurs de la séismologie, selon le terme de l'époque : il a établi par des relevés rigoureux et nombreux que les tremblements de terre étaient en relation avec la géologie et non avec les phases de la lune ou les volcans souterrains comme on le supposait au début du XXe siècle. En 2006, le Laboratoire International Montessus de Ballore est créé entre le CNRS-INSU et l'Université du Chili à Santiago. Le second, Robert " Bernard de Montessus de Ballore ", a œuvré pour les mathématiques : il a reçu un Grand Prix de l'Académie des Sciences en 1906 pour ses travaux dans le domaine des fr…
Distribution and sources of bulk organic matter (OM) on a tropical intertidal mud bank in French Guiana from elemental and isotopic proxies
2014
International audience; The mobile French Guiana coast is a shoreface region downdrift of the Amazon River, where enormous quantities of inorganic and organic materials are exchanged with the Atlantic Ocean. The rapid accumulation of these materials forms highly unstable shore-attached mud banks, which can be temporally emerged and then rapidly colonized and stabilized by microphytobenthos and opportunistic mangroves (i.e. Avicennia germinans). Mud banks are preferential sites for the accumulation and significant remineralization of organic matter (OM) due to intense erosion/deposition cycles and potential biological colonization. The distribution and sources of bulk sedimentary OM were cha…