A5044468660- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Astro and Planetary Science
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Geophysical and Geoelectrical Methods
- Geochemistry and Geologic Mapping
- Earthquake Detection and Analysis
- earthquake and tectonic studies
- Metallurgical Processes and Thermodynamics
- Scientific Research and Discoveries
- Space Exploration and Technology
- Seismic Waves and Analysis
- Glass properties and applications
- Magnetic and Electromagnetic Effects
- Geology and Paleoclimatology Research
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Metal Extraction and Bioleaching
- Geological and Geophysical Studies
- Iron and Steelmaking Processes
- Mineralogy and Gemology Studies
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Mineral Processing and Grinding
Carnegie Institution for Science
2021-2025
University of California, San Diego
2014-2023
Scripps Institution of Oceanography
2014-2021
UC San Diego Health System
2021
Arizona State University
2011-2015
Université d'Orléans
2008-2014
Centre National de la Recherche Scientifique
2008-2014
Bureau de Recherches Géologiques et Minières
2014
Massachusetts Institute of Technology
2009-2012
Institut des Sciences de la Terre
2007-2011
Analysis of lunar laser ranging and seismic data has yielded evidence that been interpreted to indicate a molten zone in the lowermost mantle overlying fluid core. Such provides strong constraints on models thermal evolution. Here we determine thermochemical physical structure deep Moon by inverting geophysical (mean mass moment inertia, tidal Love number, electromagnetic sounding data) combination with phase-equilibrium computations. Specifically, assess whether layer is required data. The...
Quantitative interpretation of MT anomalies in volcanic regions requires laboratory measurements electrical conductivities natural magma compositions. The three lava compositions from Mount Vesuvius (Italy) have been measured using an impedance spectrometer. Experiments were conducted on both glasses and melts between 400 1300°C, at ambient pressure air high pressures (up to MPa). Both dry hydrous 5.6 wt % H 2 O) melt investigated. A change the conduction mechanism corresponding glass...
Abstract Alkaline earth sulfides are possibly abundant in the mantle of Mercury, and knowledge their melting transport properties is needed to investigate structure planet. We report electrical experiments at pressures range 2–5 GPa temperatures up ∼2,400 K on proposed analogs natural sulfides, that is, Ca 1‐x Mg x S with minor impurities. Electrical conductivity increases nonuniformly temperature no systematic dependence cation composition. At relatively low (near 1,100 K), conductivities...
Electrical impedance measurements in the laboratory on silicate melts are used to interpret magnetotelluric anomalies. On basis of 2- and 4-electrode measurements, we show that influence electrodes 2-electrode system measured resistivity can be significant importance for low-resistivity increases with temperature. At 1400 °C, very conductive two reach six times value four electrodes. A short-circuit experiment is needed correct data. Electrodes contribution also estimated samples from other...
The decline of Mars' global magnetic field some 3.8-4.1 billion years ago is thought to reflect the demise dynamo that operated in its liquid core. was probably powered by planetary cooling and so termination intimately tied thermochemical evolution present-day physical state Martian Bottom-up growth a solid inner core, crystallization regime for Earth's has been found produce long-lived leading suggestion core remains entirely this day. Motivated experimentally-determined increase Fe-S...
Two mafic eruptive products from Vesuvius, a tephrite and trachybasalt, have been crystallized in the laboratory to constrain nature of primitive Vesuvius magmas their crustal evolution. Experiments were performed at high temperatures (from 1000 ≥1200°C) both 0·1 MPa pressures 50 200 MPa) under H2O-bearing fluid-absent H2O- CO2-bearing fluid-present conditions. started glass except for few that plus San Carlos olivine crystals force saturation. Melt H2O concentrations reached maximum 6·0 wt...
Abstract The presence of melt in the Earth's interior depends on thermal state, bulk chemistry, and dynamics. Therefore, investigation physical chemical properties is a probe planet's structure, dynamics, potentially evolution. Here we explore by interpreting geophysical data sets sensitive to (electromagnetic seismic) with considerations petrology and, particular, peridotite partial melting. We present petrology‐based model electrical conductivity fertile depleted peridotites during Seismic...
Magnetotelluric data have been increasingly used to image subduction zones. Models of electrical resistivity commonly show features related the release fluids at several depths through systems imaged, consistent with thermal and petrologic models dehydration downgoing slab. Imaging from sediments pore space in crust requires controlled source electromagnetic techniques, which date only one setting, offshore Nicaragua. The transition basalt eclogite is imaged magnetotelluric data. Deeper...
The Vredefort impact crater in South Africa is one of the oldest and largest craters on Earth, making it a unique analog for planetary basins. Intense randomly oriented remanent magnetization observed surface samples at has been attributed to impact‐generated magnetic fields. This possibility major implications extraterrestrial paleomagnetism since fields have proposed as key alternative dynamo hypothesis Moon asteroids. Furthermore, presence single‐domain magnetite found along...
By enhancing mass transfer and energy release, the cycle of volatiles melt is a major component subduction. Investigating this fluid therefore critical to understand past current activity subduction zones. Fluids can significantly affect rock electrical conductivity elastic parameters that are measured using electromagnetic seismic methods, respectively. This letter emphasizes how these geophysical methods complement each other provide information about storage fluids in systems. compiling...