ARGANT Alain | Aix-Marseille University (original) (raw)

Papers by ARGANT Alain

Accessible à l'adresse : http://www.ville-ge.ch/mhng/paleo/paleo-pdf/29-2/pal\_29\_2\_07\_20.pdf

Économie et société de la fin de la Préhistoire : Actualité de la recherche, 2010

Préparation du manuscrit éric Thirault L'organisation matérielle du colloque a reposé sur la part... more Préparation du manuscrit éric Thirault L'organisation matérielle du colloque a reposé sur la participation active de Geneviève Martin (SRA), l'aide financière de l'Université Lumière-Lyon 2, ainsi que sur l'aide bénévole de personnels de la Culture et d'étudiants de l'Université. La publication des Actes a pu se faire grâce à l'aide financière du

Journal of Archaeological Science, 2008

The analysis of phytoliths, pollen, charcoal and other macroremains was carried out in the neolit... more The analysis of phytoliths, pollen, charcoal and other macroremains was carried out in the neolithic shelter of ''La Grande Rivoire'', Vercors massif (French Alps). The results show the predominance of tree species, in the form of phytoliths, clustered pollen, stomata, small branches charcoal, needles, bark, buds. The practice of leaf fodder is already known in the alpine and circum-alpine area from archaeological and historical sources. The analyses of the neolithic dung levels of ''La Grande Rivoire'' illustrate the use of leafy and flowering tree branches as fodder. The results also suggest that some species were used for special purpose in relation with the tending of livestock (litter, dietary supplement, veterinary practices).

Quaternary Science Reviews, 2020

This paper studies mire initiation modalities from the Late-Glacial to the Holocene by comparing ... more This paper studies mire initiation modalities from the Late-Glacial to the Holocene by comparing radiocarbon ages on basal peat layers (112 sites from the Eastern French Massif Central e EFMC) with long-term land cover changes. We developed a semi-quantitative method based on the degree of openness and on Anthropogenic Impact Factors (AIF scores) from palaeoecological data (mire and lake records). Archaeological information was also considered to evaluate human impact. We compared regional mire development trends with datasets from Northern Europe, Siberia, Alaska and Canada, and with global CH 4 emission. Heterogenous cases of mire initiation were highlighted during the last 15 ka years in the EMFC. From 15 to 11.7 ka cal. BP, some mires and histic horizons occurred, although further research is needed to better understand these peat accumulation phases. Related to the Early Holocene warming, a mire generation established by terrestrialization, in the southern EFMC where geomorphology favoured fens. Bogs also formed by paludification in the whole area between 10 and 7 ka cal. BP. Then, various cases of mire initiation were found from 4.4 to 2.4 ka cal. BP. The high number of mires established since 2.4 ka cal. BP could be related to major anthropogenic changes, indirectly favouring fens (in former ponds for instance) or small bogs (at the back of roads, walls or in abandoned drainage systems). This last generation was typical of Western European mountains and implied that moderate human impact may also produce socio-ecosystems with high ecological value.

Quaternaire, 2010

Le site archéologique du Parc Saint-Georges à Lyon (Rhône-France) est localisé sur la rive droite... more Le site archéologique du Parc Saint-Georges à Lyon (Rhône-France) est localisé sur la rive droite de la Saône. L'étude géomorphologique a pu caractériser notamment la confluence du Rhône et de la Saône primitive au cours du premier Âge du Fer. À la fin de La Tène, l'évolution des conditions bioclimatiques conduit à l'encaissement et au retrait du Rhône sur sa rive gauche. La Saône s'ouvre alors un chenal plus direct dans la plaine ; ses deux bras confluent dans la partie sud de l'emprise autour de notre ère. Sur ce nouveau site de confluence se greffe une activité riveraine en étroite relation avec la mobilité des rives, du I er siècle ap. J.-C. au milieu du I I I e siècle ap. J.-C., période marquant le remblaiement de la Saône primitive et un tracé de rive proche de l'actuel. Une approche interdisciplinaire associant géo-archéologie, carpologie, palynologie et malacologie propose des éléments de reconstitution de la topographie, de la paléohydrologie, du paysage et des relations homme-milieu de la Protohistoire à l'époque gallo-romaine.

Dans le cadre du Projet Collectif de Recherches « la fin du Paléolithique supérieur dans les Alpe... more Dans le cadre du Projet Collectif de Recherches « la fin du Paléolithique supérieur dans les Alpes du Nord et le Jura méri-dional », des études paléoenvironnementales ont permis de reconstruire la végétation et le climat des sociétés magdaléniennes et aziliennes de l'espace géographique concerné. Un sondage sédimentaire dans le lac de La Thuile, à 884 m d'altitude et situé au sud-est du massif des Bauges, a fait l'objet d'ana-lyses à haute résolution des grains de pollen, des macrorestes végétaux et de l'oxygène isotopique. Abstract Palaeoenvironmentals studies have been conducted within the framework of a project entitled " the end of upper Palaeolithic in the Northern Alps and Southern Jura " . They allowed to reconstruct the vegetation and climate during Magdalenian and Azilian periods. A sediment core was collected from Lake of La Thuile at 884 m a.s.l. in South eastern of Bauges massif. Pollen, plant macrofos-sils and oxygen isotopic were analysed ...

Gallia, 2007

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives| 4.0 International License Un ancien lac au pied de l'oppidum de Gergovie (Puy-de-Dôme) : interactions sociétés-milieux dans le bassin de Sarliève à l'Holocène

Annales g?ologiques de la Peninsule balkanique, 2007

The results of pollen analyses of hyaena coprolites from the Early Pleistocene cave of Trlica in ... more The results of pollen analyses of hyaena coprolites from the Early Pleistocene cave of Trlica in northern Montenegro and the Late Pleistocene cave of Baranica in southeast Serbia are described. The Early Pleistocene Pachycrocuta brevirostris, and the Late Pleistocene Crocuta spelaea are coprolite-producing species. Although the pollen concentration was rather low, the presented analyses add considerably to the much-needed knowledge of the vegetation of the central Balkans during the Pleistocene. Pollen extracted from a coprolite from the Baranica cave indicates an open landscape with the presence of steppe taxa, which is in accordance with the recorded conditions and faunal remains. Pollen analysis of the Early Pleistocene samples from Trlica indicate fresh and temperate humid climatic conditions, as well as the co-existence of several biotopes which formed a mosaic landscape in the vicinity of the cave.

Braunschweiger Naturkundliche Schriften Band, 2012

The OURSALP-Programme aimed to register bears of all epochs in the Jura and the French Alps. The ... more The OURSALP-Programme aimed to register bears of all epochs in the Jura and the French Alps. The first conclusions of the OURSALP-Programme mainly concern the Chartreuse massif which yields the youngest Ursus spelaeus known in the Prealps. In the Chablais Alps, the Baré Cave at Onnion (Haute-Savoie, France) diggen by J.-c. SpAhni and D. rigASSi in 1950-1951, yielded an important palaeontological material, with many bear remains. The 14 C-AMS dating of six pieces determines the chronology of the fauna assemblage, from 21,970 ± 250 BP to 36,100 ± 1,400 BP. Three morphotypes were selected among six second upper molars of cave bear and ancient DNA analysis was attempted at the CEA Saclay in Gif-sur-Yvette. One positive result indicates that they belong with certainty to the Ursus spelaeus group.

Quaternaire, Oct 24, 2011

At present, numerous sites from Europe and Asia have yielded up remains of Panthera gombaszogensi... more At present, numerous sites from Europe and Asia have yielded up remains of Panthera gombaszogensis (= gombaszoegensis). It is without doubt the one Felid most similar to Panthera onca but it is an ancestor, not the present day jaguar. Palaeogenetics estimates the divergence between the lion and the jaguar to 2 Myrs. Obviously, jaguars originate from Africa and they spread in Europe between 1.95 et 1.77 Myrs during the time of Olduvai polarity subchron. Recently Hemmer et al. (2010) demonstrated that the semi-mandible of Dmanissi (Georgia) corresponds with a new taxon Panthera onca georgica ssp. nov., the earliest known Asian member of the species. This taxon spread out through Asia and got to North America during a glacial period between 0.99 and 0.78 Myrs (between the Jaramillo polarity subchron and the end of the Matuyama magnetochron), and finally reached South America not before the Rancholabrean. The Château Breccia (Saône-et-Loire, France) has given an abundant paleontological material of Panthera gombaszogensis (about 400 remains, with a minimum of 6 individuals). It is the mid Middle Pleistocene European form. The pollen analysis indicates temperate climatic conditions but cooler than today and sometimes even quite cold. The landscape was open with grasses spread over the uplands, while woodlands of pine and fir, but also some broadleaved trees were found in the valley. The Château Breccia largely contributes to the story of Panthera gombaszogensis. It demonstrates that the species was at least adapted to a cold temperate climate and to a biotope highly different from that of the today's jaguar. It shows also the replacement of Panthera gombaszogensis by Panthera spelaea fossilis about 0.6 Myrs ago, after a period of coexistence of these two Felids.

Cour. Forsch. Inst. Senckenberg, 2004

The Château site, known since 1863, was rediscovered in 1968 and new excavations were carried out... more The Château site, known since 1863, was rediscovered in 1968 and new excavations were carried out there between 1997 and 2006. Bear remains largely dominated the Château Breccia fossil assemblage, but the characteristic peculiarity of this site was the abundance of big cats. The old karstic system, including the Château Breccia fossil site, has been completely destroyed, primarily by erosion, but later by quarrying. During the Pleistocene the cave served as hibernation dens for bears. This was most likely also the birthplace for bear cubs. These bear cubs, whether alive or dead, could be a significant source of food for big cats during the winter. The stratigraphy of the infill (Northern Section) reveals successive phases of occupation. The two main fossiliferous layers were labelled Breccia 4 (Br. 4) and Breccia 2 (Br. 2), the former being the earliest. In both cases, we noticed different, though equivalent, animal associations: a bear (Ursus deningeri), a big cat (Panthera gombasz...

Quaternaire, 2011

Le gisement paléontologique de Ceyssaguet fouillé par M.-.F. Bonifay de 1984 à 1997 a fourni une ... more Le gisement paléontologique de Ceyssaguet fouillé par M.-.F. Bonifay de 1984 à 1997 a fourni une faune abondante d'âge villafranchien datée de 1,2 Ma. La nature loessique du sédiment encaissant s'est montrée défavorable à la conservation du pollen, interdisant toute reconstitution du milieu végétal contemporain. La découverte de coprolithes de hyènes a donné l'opportunité d'effectuer une analyse pollinique sur un milieu de conservation fiable. Le pollen extrait des cinq coprolithes analysés, indique des conditions climatiques tempérées fraîches, et un paysage en mosaïque où se côtoient des zones boisées et des espaces ouverts où pouvaient évoluer les grands herbivores.

Fig. 1 La falaise de la Grande Rivoire avec à sa base, dans l'ombre, le surplomb naturel qui form... more Fig. 1 La falaise de la Grande Rivoire avec à sa base, dans l'ombre, le surplomb naturel qui forme l'abrisous-roche.

We present a new method for the numerical implementation of generating boundary conditions for a ... more We present a new method for the numerical implementation of generating boundary conditions for a one dimensional Boussinesq system. This method is based on a reformulation of the equations and a resolution of the dispersive boundary layer that is created at the boundary when the boundary conditions are non homogeneous. This method is implemented for a simple first order finite volume scheme and validated by several numerical simulations. Contrary to the other techniques that can be found in the literature, our approach does not cause any increase in computational time with respect to periodic boundary conditions.

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