A5052719510- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Astro and Planetary Science
- Clay minerals and soil interactions
- Crystal Structures and Properties
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Geologic Mapping
- Planetary Science and Exploration
- Thermal Expansion and Ionic Conductivity
- Geological Studies and Exploration
- Metallurgical Processes and Thermodynamics
- Mineral Processing and Grinding
- Earthquake Detection and Analysis
- Geochemistry and Elemental Analysis
- Advanced ceramic materials synthesis
- Radioactive element chemistry and processing
- Diamond and Carbon-based Materials Research
- Geophysical and Geoelectrical Methods
- Microwave Dielectric Ceramics Synthesis
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
Institut de Recherche pour le Développement
2013-2024
Laboratoire Magmas et Volcans
2015-2024
Université Clermont Auvergne
2005-2024
Centre National de la Recherche Scientifique
2011-2024
Observatoire de Physique du Globe de Clermont-Ferrand
2018
Institut de minéralogie, de physique des matériaux et de cosmochimie
2017
Clermont Université
2014-2015
Genetique Reproduction and Developpement
2014
European Synchrotron Radiation Facility
2006
University of Bayreuth
2000-2003
Abstract Water plays an important role in most processes within the Earth's mantle, e.g. transport phenomena, differentiation and seismic properties. This paper reviews various aspects of water with a special emphasis on content nominally anhydrous minerals, especially lower-mantle minerals. The saturation upper mantle respect to is calculated as function pressure, based available water-solubility data obtained for upper-mantle result indicates that saturated at pressures between 2 4 GPa...
Research Article| January 01, 2006 Thermodynamics of Water Solubility and Partitioning Hans Keppler; Keppler Bayerisches Geoinstitut Universität Bayreuth 95440 Bayreuth, Germany, e-mail: Hans.Keppler@uni-bayreuth.de Search for other works by this author on: GSW Google Scholar Nathalie Bolfan-Casanova Laboratoire Magmas et Volcans - CNRS UMR 6524 63038 Clermont-Ferrand cedex, France, N.Bolfan@opgc.univ-bpclermont.fr Reviews in Mineralogy Geochemistry (2006) 62 (1): 193–230....
The geological materials in Earth's lowermost mantle control the characteristics and interpretation of seismic ultra–low velocity zones at base core-mantle boundary. Partial melting bulk lower is often advocated as cause, but this does not explain nonubiquitous character these regional features. We explored properties mid-oceanic ridge basalt (MORB), which can reach after subduction oceanic crust. At a pressure representative boundary (135 gigapascals), onset occurs ~3800 kelvin, ~350 kelvin...
Water partitioning experiments were performed in MgO ± FeO Al 2 O 3 ‐SiO ‐H systems at 24 GPa and 1400°C 1750°C the multi‐anvil press. In high‐temperature experiments, water was not detected near‐infrared spectra of perovskite. samples synthesized 1400°C, Al‐free systems, (Mg,Fe)SiO perovskite coexisting with hydrous ringwoodite contained 1–2 ppm wt H O. The partition coefficient D ringwoodite/perovskite between varies ∼1050 1400. presence aluminium coexisted superhydrous phase B. Raman...
Abstract Among binary compounds, there is a high potential for discovery of novel members (polymorphic phases or compounds) the nitrides transition metals group due to pronounced dependence oxidation state (M) on pressure. The power pressure–high temperature (HP‐HT) route synthesis has already been demonstrated by cubic 4 and 14 elements, crystalline polymorphs P 3 N 5 , reports formation four noble metal nitrides. It anticipated that such HP products exhibit, in addition enhanced elastic...
Abstract Olivine-hosted melt inclusions (MIs) provide samples of magmatic liquids and their dissolved volatiles from deep within the plumbing system. Inevitable post-entrapment modifications can lead to significant compositional changes in glass and/or any contained bubbles. Re-heating is a common technique reverse MI crystallisation; however, its effect on volatile contents has been assumed be minor. We test this assumption using crystallised glassy basaltic MIs, combined with Raman...
During planetary accretion, hydrogen behaves as a lithophile element and is unlikely to be major in cores.
Mantle wedge regions in subduction zone settings show anomalously high electrical conductivity (~1 S/m) that has often been attributed to the presence of aqueous fluids released by slab dehydration. Laboratory-based measurements hydrous phases and are significantly lower cannot readily explain geophysically observed conductivity. The fluid also rehydrates mantle stabilizes a suite phases, including serpentine chlorite. In this present study, we have measured natural chlorite at pressures...
Abstract The low-velocity layer (LVL) atop the 410-km discontinuity has been widely attributed to dehydration melting. In this study, we experimentally reproduced wadsleyite-to-olivine phase transformation in upwelling mantle across and investigated situ sound wave velocity during partial melting of hydrous peridotite. Our seismic model indicates that globally observed negative Vs anomaly (−4%) can be explained by a 0.7% melt fraction peridotite at base upper mantle. produced is richer FeO...
Abstract Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour the Earth’s mantle play an important role global tectonics, magmatism volatile cycle. Water concentrations ratios hydrogen isotopes give insight into these processes, as well origin terrestrial water. Here we show presence molecular H 2 (omphacites) from eclogites Kaapvaal Siberian cratons. These omphacites contain both high (70 to 460 wt. ppm) OH. Furthermore, their ∂D values increase with...