A5070409299- Groundwater flow and contamination studies
- Hydrocarbon exploration and reservoir analysis
- Soil and Unsaturated Flow
- Geological and Geochemical Analysis
- Glass properties and applications
- CO2 Sequestration and Geologic Interactions
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Geologic Mapping
- Concrete and Cement Materials Research
- Mine drainage and remediation techniques
- Clay minerals and soil interactions
- Nuclear materials and radiation effects
- Radioactive element chemistry and processing
- Groundwater and Isotope Geochemistry
- Geology and Paleoclimatology Research
- Heavy metals in environment
- Recycling and utilization of industrial and municipal waste in materials production
- Geochemistry and Elemental Analysis
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Building materials and conservation
- Metallurgical Processes and Thermodynamics
- Arsenic contamination and mitigation
- Geological Modeling and Analysis
- Mining and Gasification Technologies
Bureau de Recherches Géologiques et Minières
2016-2025
United States Geological Survey
2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2018
CEA Marcoule
2013-2018
Centre de Géosciences
2011-2018
ParisTech
2018
Université Paris Sciences et Lettres
2018
École Nationale Supérieure des Mines de Paris
2013
Abstract The long‐term behavior of high‐level radioactive waste glass depends on the mineralogical and geochemical interactions between various components multibarrier system, under geological repository conditions. present study focuses SON68 alteration in synthetic cement water at 50°C 70°C. While pH > 10, dissolution rates were lower when contacting than deionized water. This effect stems from high Ca concentration presence Si porewater. initial low reaction progress (3.4 ± 1.0 × 10 −2...
Abstract The evaporation of seawater in arid climates is currently the main accepted driving mechanism for formation ancient and recent salt deposits shallow basins. However, deposition huge amounts marine salts, including tens metres highly soluble types (tachyhydrite bischofite) during Aptian South Atlantic Messinian Salinity Crisis, are inconsistent with wet warm palaeoclimate conditions reconstructed these periods. Recently, a debate has been developed that opposes classic model...
We investigated the dissolution of a natural Fe-containing dolomite [Ca1.003Mg0.972Fe0.024Mn0.002(CO3)2] under acidic conditions (pH 3–5.5) with atomic force microscopy (AFM) at 20 °C and batch experiments 80 °C. Dolomite proceeded by two identified mechanisms: removal layers through spreading coalescence etch pits nucleated defect points, stepped retreat from surface edges. The rate increased when pH decreased (from 0.410 nm s–1 3 to 0.035 5). Rates calculated edge (vedges) etch-pit rates...
The physical and chemical properties of clay-rocks are, at least partly, controlled by the composition their pore water. In evaluating concept disposing radioactive waste in clay-rock formations, determining water is an important step predicting how a will behave over time as function external forces, such thermal perturbations. This study aimed to assess experimental modeling methodology calculate temperature (up 80 °C). Hydrothermal alteration experiments were carried out on samples. We...
Lacustrine carbonates formed in rift settings are increasingly studied not only as archives of Earth chemical and climatic history but also potential hydrocarbon source rocks and/or reservoirs. The role magmatic gases their formation diagenetic evolution, hence reservoir properties, remains unclear. We the first meter carbonate sediment Dziani Dzaha volcanic crater lake (Mayotte Island) developed a reactive-transport model with CrunchFlow software that allows quantification reactions by...
Abstract The volcanic crater lake of Dziani Dzaha in Mayotte is studied to constrain the geochemical settings and diagenetic processes at origin Mg‐phyllosilicates associated with carbonate rocks. characterized by intense primary productivity, gases bubbling three locations a catchment phonolitic/alkaline composition. water has an alkalinity ca 0·2 mol l −1 pH values 9·3. Cores sediments reaching up one metre length were collected means carbon–hydrogen–nitrogen elemental analyzer, X‐ray...
In northern Switzerland, the Opalinus Clay, a Jurassic claystone formation, is foreseen as host rock for deep geological repository radioactive waste. Characterizing its porewater of particular importance assessing mobility radionuclides and stability engineered barriers. Although composition Clay fairly well known, there still controversy on sources sulphate obtained by different characterization methods. A striking observation that concentrations from aqueous extraction recalculated to...
The oxidation profile of a surficial clay aquitard was studied on 35-meter borecore from the Albian Tégulines Clay near Brienne-le-Château (Paris Basin, France). Mineralogical, geochemical, and petrophysical data showed evidences gradual taking place down to depth 20 m. Below m, material nonplastic nonfractured, it inherited reduced redox conditions bacterial sulfate reduction that occurred after sediment deposition. Above plastic. Up 10-11 only rare yellowish aggregates glauconite attested...
Abstract In the present study, chemical composition, mineralogy, and mechanisms of alteration a cementitious grout based on CEM III/C with addition smectite, hydrotalcite, silica fume, are studied using combination physical methods. This material was designed in context geological repository radioactive wastes, twofold aim: first, to fill technical voids left by drilling operations at interface between formation disposal galleries. Second, neutralize potential acidic transient due pyrite...
Abstract Silicate glasses are durable materials but laboratory experiments reveal that elements derive from their environment may induce high corrosion rates and reduce capacity to confine high-level radioactive waste. This study investigates nuclear-glass in geological media using an situ diffusion experiment multi-component modelling. The model highlights the pH imposed by Callovo–Oxfordian (COx) claystone host rock supports secondary-phase precipitation increases glass compared with pure...
Anthropogenic radionuclides (RN) are generated by a wide range of industrial and medical activities. In the contexts waste storage, quantification RN migration is paramount importance. partly ruled interaction with solid surfaces. Usually experiments conducted at various scales from laboratory to field in order measure retention retardation parameters radiotracers. Whereas this experimental approach mandatory tackle issue migration, understanding natural speciation stable isotopes that...
This study is a preliminary work on the description and modeling of mechanisms potentially causing discrepancies between experimental data thermodynamic calculation performed carbonate equilibrium at high temperature. A better understanding dolomite dissolution/precipitation processes that occur during its equilibration important for investigations high-level radioactive waste disposal or Carbon Capture Storage (CCS). The first results demonstrated fast in solution (within 12 days) good...