A5021735505- Laser-induced spectroscopy and plasma
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Cultural Heritage Materials Analysis
- Laser Material Processing Techniques
- Analytical chemistry methods development
- Geology and Paleoclimatology Research
- Mass Spectrometry Techniques and Applications
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Paleontology and Stratigraphy of Fossils
- Mineralogy and Gemology Studies
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Laser-Ablation Synthesis of Nanoparticles
- Optical Imaging and Spectroscopy Techniques
- Planetary Science and Exploration
- Random lasers and scattering media
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Atmospheric aerosols and clouds
- Radioactive element chemistry and processing
- Quantum optics and atomic interactions
- Geological and Geophysical Studies Worldwide
- Geochemistry and Geochronology of Asian Mineral Deposits
Géosciences Environnement Toulouse
2011-2024
Centre National de la Recherche Scientifique
2010-2024
Institut de Recherche pour le Développement
2010-2024
Université de Toulouse
2010-2024
Université Toulouse III - Paul Sabatier
2020-2024
Observatoire Midi-Pyrénées
2016-2020
University of Geneva
2015-2016
NASA Astrobiology Institute
2013-2014
University of Wisconsin–Madison
2013-2014
Office National d'Études et de Recherches Aérospatiales
2010-2012
Abstract Large-volume caldera-forming eruptions of silicic magmas are an important feature continental volcanism. The timescales and mechanisms assembly the magma reservoirs that feed such as well durations physical conditions upper-crustal storage remain highly debated topics in volcanology. Here we explore a comprehensive data set isotopic (O, Hf) chemical proxies precisely U-Pb dated zircon crystals from all Yellowstone supervolcano. Analysed zircons record rapid multiple by repeated...
Abstract Economically important porphyry Cu-Mo deposits (PCDs) are generally hosted by upper-crustal plutons of variable chemical compositions related to distinct geodynamic settings. The absolute timing and duration pluton assembly PCD formation critical understanding the genetic relationship between these interrelated processes. Here, we present new comprehensive zircon U-Pb molybdenite Re-Os ages that tightly constrain age mineralization in one largest ore-bearing central Tethyan...
The figures of merit fs laser ablation for LA-ICP-MS analysis are reviewed.
The analytical study of infra red femtosecond laser induced particles has been performed using Transmission Electron Microscopy (TEM) and Low Pressure Impaction (ELPI). Various natural synthetic matrices have tested: monazite (phosphate), zircon (silicate), NIST610 (glass), spinel (oxide), quartz (silicate structure), silicon (semiconductor) Nordic gold (metallic alloy). Three types are systematically observed: very rare large round spherical (dp ≈ 1 μm) whose composition is close to the...
The need for femtosecond laser ablation (fs-LA) systems coupled to MC-ICP-MS accurately perform in situ stable isotope analyses remains an open question, because of the lack knowledge concerning ablation-related isotopic fractionation this regime. We report first iron analysis size-resolved, laser-induced particles natural magnetite, siderite, pyrrhotite, and pyrite, collected through cascade impaction, followed by solution nebulization MC-ICP-MS, as well imaging using electron microscopy....
The influence of ablation cell geometry (Frames single‐ and HelEx two‐volume cells) laser wavelength (198 266 nm) on aerosols produced by femtosecond (fs‐ LA ) were evaluated. Morphologies, iron mass distribution ( IMD 56 Fe/ 54 Fe ratios particles generated from magnetite, pyrite, haematite siderite studied. following two morphologies identified: spherules (10–200 agglomerates (5–10 nm). Similarity in rate at 198 nm indicates similar mechanisms. increased with aerodynamic particle size as a...
Abstract Garnet–clinopyroxene ultra‐high‐pressure (UHP) rocks from the northern Bohemian Massif contain zircon with micro‐diamond inclusions. Trace element concentrations, oxygen and hafnium isotopic composition U–Pb age of distinct textural domains in characterize their growth conditions temporal evolution. Diamond‐bearing mantle relicts oscillatory zoning have uniform Th/U ratios (~0.1–0.2), high‐Ti contents (110–190 ppm, corresponding to temperatures at least 1100 °C), some (two 17...
We studied the influence of pulse energy (E0) and width (τ) Near Infra Red femtosecond Laser Ablation coupled to Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). A particular emphasis was put on 206Pb/238U 208Pb/232Th repeatability from Moacyr monazite (Itambe, Brazil). Synthetic glass (Standard Reference Material) NIST610 used as a reference material, well Manangotry (Madagascar). Pulse investigated in range E0 = 0.03 0.8 mJ/pulse (τ 60 fs) while has been τ fs 300 (E0 0.1...
Abstract Accurate and precise dating of individual volcanogenic beds that spread across multiple sedimentary successions is a powerful tool to untangle stratigraphic age contradictions, since these horizons are deposited synchronously. In this study, we show combining apatite chemistry with zircon age, Th/U ratio, Hf isotope composition leads reliable lateral correlation volcanic sections representing disparate biological, chemical, physical paleoenvironments. We correlate two six straddling...
Infrared femtosecond laser induced damage has been studied in order to determine, with analytical protocols, the processes involved ablation this regime. Transmission Electron Microscopy (TEM) coupled Focused Ion Beam (FIB) milled cross-sections of natural ablated monazite were used. Craters formed using N = 1 and 3 shots, E0 0.1 0.8 mJ per pulse τ 60 fs. Observations revealed that settings induce little changes nature size damaged structures. The crater bottom forms a ∼0.5 μm layer composed...
We have developed a new experimental setup based on optical Kerr gating in order to isolate either the transmitted or scattered light going through an optically thick medium. This selectivity can be obtained by finely tuning focusing of different laser beams setup. A Monte Carlo simulation scheme generates accurate model scattering processes taking into account time flight, geometry and polarization. show that our is capable analyzing with densities up OD = 9.7, beyond 347 poly-disperse...
In this study, we present a high precision and spatial resolution in situ Fe isotope protocol using femtosecond (fs) laser ablation multi‐collector inductively coupled plasma‐mass spectrometry (LA‐MC‐ICP‐MS). The intermediate measurement obtained over period of ca . 3 years for the USGS glass BIR‐1G against Puratronic reference material is 0.17‰ (2 s ) δ 56 Fe. Uncertainties achieved on individual analyses olivines were < 0.15‰ This associated with about 170 × 25 μm. Our results display...
The aim of this work is to evaluate the influence absorption processes on time flight light going through an absorbing and scattering thick medium (clouds, paints, gas cell, etc). In order study statistical processes, we use a Monte-Carlo simulation code with temporal phase function Debye modes. main result that inside particles induces decrease global delay.