A5076082886- Geology and Paleoclimatology Research
- Archaeology and ancient environmental studies
- Pleistocene-Era Hominins and Archaeology
- Isotope Analysis in Ecology
- Archaeological and Geological Studies
- Archaeological and Historical Studies
- Marine and coastal ecosystems
- Maritime and Coastal Archaeology
- Coral and Marine Ecosystems Studies
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Pacific and Southeast Asian Studies
- Aortic Disease and Treatment Approaches
- Congenital Heart Disease Studies
- Forensic Anthropology and Bioarchaeology Studies
- Marine Biology and Ecology Research
- Renal and Vascular Pathologies
- Ancient and Medieval Archaeology Studies
- Geological and Geophysical Studies Worldwide
- Tracheal and airway disorders
- Geological and Geophysical Studies
- Transplantation: Methods and Outcomes
- Coronary Artery Anomalies
- Marine animal studies overview
CEA Paris-Saclay
2014-2024
Laboratoire des Sciences du Climat et de l'Environnement
2014-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
Archéologie et Archéométrie
2006-2023
Centre Hospitalier Universitaire de Toulouse
2023
Digestive Health Research Institute
2023
Université de Toulouse
2023
Université Toulouse III - Paul Sabatier
2023
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2023
École Nationale Vétérinaire de Toulouse
2023
As first shown by Bard et al. (1990a), high-precision 230 Th- 234 U ages can be used successfully to calibrate the radiocarbon time scale beyond tree-ring calibration that now reaches 11,900 cal bp (Kromer and Spurk 1998). Using mass spectrometric techniques, we measured 14 C Th on new samples collected from boreholes drilled off islands of Tahiti Mururoa (French Polynesia) in order complement database previously obtained Barbados corals (Bard 1990a, 1993).
We report here on the 2007 discovery, in perfect archaeological context, of part engraved and ocre-stained undersurface collapsed rockshelter ceiling from Abri Castanet, Dordogne, France. The decorated surface 1.5-t roof-collapse block was direct contact with exposed onto which it fell. Because there no sedimentation between layer upon collapsed, is clear that Early Aurignacian occupants shelter were authors imagery. This discovery contributes an important dimension to our understanding...
Torres et al . (2010 ) published a series of radiocarbon, AAR, ESR and OSL dates from the site El Sidrón, northern Spain, which is notable for discovery partial remains 12 Neanderthals. Whilst non‐radiocarbon methods suggested an age beyond 32 600–46 300 years, direct radiocarbon on human fossils were inconsistent, ranging between 10 000 50 bp This study uses ultrafiltration pre‐treatment protocol to obtain date 48 400 ± 3200 (OxA‐21 776) bone fragment confirm antiquity Neanderthal...
Research Article| July 01, 1998 δ13C variations of loess organic matter as a record the vegetation response to climatic changes during Weichselian Christine Hatté; Hatté 1Laboratoire des Sciences du Climat et de l'Environnement, UMR 1572 CNRS/CEA, avenue la Terrasse, 91198 Gif sur Yvette cedex, France Search for other works by this author on: GSW Google Scholar Michel Fontugne; Fontugne Denis-Didier Rousseau; Rousseau 2Laboratoire Paléoenvironnements Palynologie, Institut l'Evolution,...
The age of Neanderthal remains and associated sediments from El Sidrón cave has been obtained through different dating methods ( 14 CAMS, U/TH, OSL, ESR AAR) samples (charcoal debris, bone, tooth dentine, stalagmitic flowstone, carbonate‐rich sediments, sedimentary quartz grains, enamel land snail shells). Detrital Th contamination rendered Th/U analyses flowstone unreliable. Recent C produced spurious age‐values charcoal as well inadequately pretreated samples. Most consistent dates are...
Advances in radiocarbon dating by accelerator mass spectrometry (AMS) have made it possible to date prehistoric cave paintings sampling the pigment itself instead of relying on dates derived from miscellaneous remains recovered vicinity paintings. The work at Laboratoire des Sciences du Climat et de l'Environnement (LSCE) concentrated charcoal southern France and northern Spain. In most caves, samples were collected several paintings, some instances sample size allowed for multiple...
This study presents the first Late Holocene marine pollen record (core ND2) from SE Sicily. It encompasses last 3000 years and is one of most detailed records south-central Mediterranean region in terms time resolution. The combined approach palynology historical ecology, supported by independent palaeoclimate proxies, provides an integrated regional reconstruction past vegetational dynamics relation to rapid climatic fluctuations, socio-economic processes, land-use practices, offering new...
We constructed a semi-automated system to transform carbonate samples CO 2 , as means increase sample-processing capacity. The physico-chemical process includes hydrolysis of carbonate, quantification the mass carbon and collection in glass ampoule. is computer-controlled monitored, all data are stored. A single run five consecutive requires about 3.5 hours. Measurements 14 C concentrations were made on IAEA C-1 Carrara marble test reliability this system. These measurements have allowed...
After a brief presentation of the experimental protocols, this article discusses results 14C dates obtained from charcoal specimens collected on walls (drawings and torch-wipes) ground Chauvet Cave. The dates, which are coherent, can be divided into two periods few millennia apart: between 33000 29000 years BP (33 samples including five parietal representations) 27000 24500 14 C (13 four torch-wipes).
Because hard tissues can be radiocarbon dated, they are key to establishing the archaeological chronologies, palaeoenvironmental reconstructions and historical-biogeographical processes of last 50,000 years. The advent accelerator mass spectrometers (AMS) has revolutionized field archaeology but routine AMS dating still requires 60-200 mg bone, which far exceeds that small vertebrates or remains hold a patrimonial value (e.g. hominid worked bone artefacts). Here, we present first dates...
Prosthetic heart valve obstruction (PHVO) is a potentially fatal complication of replacement with mechanical substitute mainly due to thrombosis. The purpose this report present single-center experience 136 consecutive patients operated on between 1978 and 2001.The diagnosis PHVO was assessed by fluoroscopy and/or echocardiography. Thrombosed valves were bileaflet (82), tilting disc (47) ball cage (7) valves; these, 90 in mitral, 38 aortic, six aortic mitral position, two tricuspid position....
In this paper, we explain our routine pretreatment of bone for radiocarbon dating by accelerator mass spectrometry (AMS), based on the specific reaction between amino acids and ninhydrin described Nelson (1991). The values uncertainties total system background are presented as a function carbon sample reliability method is discussed.
The Laboratoire des Sciences du Climat et de l'Environnement (LSCE) research program on prehistoric art conducts chronological studies of parietal representations with their associated archaeological context. This multidisciplinary approach provides arguments about the creation period representations. article presents investigations carried out in several decorated caves France (La Grande Grotte, Labastide, Lascaux, La Tête-du-Lion, Villars) and Spain Garma, Nerja, Pileta, Urdiales). Several...
Abstract. Here we show the use of 210Pb-226Ra excess method to determine growth rate two corals from world's largest known cold-water coral reef, Røst Reef, north Arctic circle off Norway. Colonies each species that build Lophelia pertusa and Madrepora oculata, were collected alive at 350 m depth using a submersible. Pb Ra isotopes measured along major axis both specimens low level alpha gamma spectrometry trace element compositions studied. 210Pb 226Ra differ in way they are incorporated...
Abstract Benthic foraminiferal assemblages and geochemical tracers (δ 18 O, δ 13 C 14 C) have been analyzed on benthic planktonic foraminifera from core MD77‐176, located in the northern Bay of Bengal, order to reconstruct evolution intermediate circulation Indian Ocean since last glaciation. Results indicate that during Last Glacial Maximum (LGM), Southern Sourced Water masses were dominant at site. A high relative abundance deep infaunal species LGM reflects low oxygen concentration and/or...