A5058728099- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Marine Bivalve and Aquaculture Studies
- Geological and Geochemical Analysis
- Calcium Carbonate Crystallization and Inhibition
- Astro and Planetary Science
- Cephalopods and Marine Biology
- Marine Biology and Ecology Research
- Geochemistry and Elemental Analysis
- Marine and fisheries research
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Ichthyology and Marine Biology
- Geological and Geophysical Studies
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Chemical Synthesis and Characterization
- Groundwater and Isotope Geochemistry
- Marine animal studies overview
- Archaeology and ancient environmental studies
- Geochemistry and Geologic Mapping
Centre National de la Recherche Scientifique
2014-2024
Laboratoire des Sciences du Climat et de l'Environnement
2022-2024
CEA Paris-Saclay
2023-2024
Université de Versailles Saint-Quentin-en-Yvelines
2023-2024
Université Paris-Saclay
2023-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2023-2024
Institute of Mineralogy
2023
Institut Pierre-Simon Laplace
2022
Université Paris Cité
2015-2021
Institut de physique du globe de Paris
2015-2021
The oxygen content of Earth's atmosphere has varied greatly through time, progressing from exceptionally low levels before about 2.3 billion years ago, to much higher afterward. In the absence better information, we usually view progress in oxygenation as a series steps followed by periods relative stasis. contrast this view, and reported here, dynamic evolution is recorded ancient sediments Republic Gabon between 2,150 2,080 million ago. oldest sequence were deposited well-oxygenated deep...
Using the CRPG‐CNRS Cameca 1270 ion microprobe facility, we have measured boron isotopic compositions ( 11 B/ 10 B) in different ultrastructural components of deep‐sea aragonitic scleractinian coral Lophelia pertusa . We observe a systematic difference B composition between Early Mineralization Zone (EMZ) and adjacent fibrous skeleton. In EMZ δ values are consistently low. Fibrous aragonite is characterized by systematically higher but also displays heterogeneity associated with specific...
Research Article| June 01, 2012 Going nano: A new step toward understanding the processes governing freshwater ooid formation Muriel Pacton; Pacton 1Geological Institute, ETH-Zürich, Rämistrasse 101, 8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Daniel Ariztegui; Ariztegui 2Section of Earth & Environmental Sciences, University Geneva, CH-1211 Genève 4, David Wacey; Wacey 3Centre Core to Crust Fluid Systems, Centre Microscopy Characterisation and...
Brachiopod shells are the most widely used geological archive for reconstruction of temperature and oxygen isotope composition Phanerozoic seawater. However, it is not conclusive whether brachiopods precipitate their in thermodynamic equilibrium. In this study, we investigated potential impact kinetic controls on modern by measuring clumped compositions shells. Our results show that depart from equilibrium due to growth rate-induced effects. These departures line with incomplete hydration...
Significance The 2.1 billion-year-old sedimentary strata contain exquisitely preserved fossils that provide an ecologic snapshot of the biota inhabiting oxygenated shallow-marine environment. Most striking are pyritized string-shaped structures, which suggest producer have been a multicellular or syncytial organism able to migrate laterally and vertically reach for food resources. A modern analogue is aggregation amoeboid cells into migratory slug phase in cellular slime molds during time...
Oxygen isotopic compositions of historical emerald artifacts from the Gallo-Roman period to 18th century indicate that during times, artisans worked emeralds originating deposits supposedly discovered in 20th century. In antiquity, Pakistani and Egyptian were traded by way Silk Route. Together with Austrian stones, they only source gem-quality emeralds. Immediately after discovery Colombian mines Spaniards 16th century, a new trade route was established, first via Spain Europe India then...
The analytical capabilities of the ims 1270 ion microprobe (SIMS) in determining O and C isotope compositions biogenic carbonate samples have been tested. Results indicated that, with a spot size ≊ 30 μm, average reproducibility at 1s level was 0.3‰ for oxygen isotopes 0.6‰ carbon isotopes. Nevertheless, this can reach 0.2‰ determinations during some sessions. These reproducibilities allowed us to perform analyses on environmental studies. In paper, examples measurements are presented modern...
Carbonates have variable chemical composition and crystal structure, which can affect the accuracy of in situ (SIMS) isotopic measurements. Carbonate reference materials (calcite, dolomite, ankerite, magnesite, siderite, rhodochrosite) were characterised for δ18O by IRMS, electron microprobe, then used to evaluate SIMS instrumental mass fractionation (IMF) oxygen isotopes. A clear relationship between IMF MgO (wt%) content was observed during two different sessions low Fe- Mn-carbonates. For...