A5006027543- Astro and Planetary Science
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Metallurgical Processes and Thermodynamics
- Astrophysics and Star Formation Studies
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Catalytic Processes in Materials Science
- Thermal and Kinetic Analysis
- Mineralogy and Gemology Studies
- Nuclear Physics and Applications
- Gas Dynamics and Kinetic Theory
- Geochemistry and Elemental Analysis
- Spacecraft and Cryogenic Technologies
- Radioactive element chemistry and processing
- Catalysis and Oxidation Reactions
- Molecular Spectroscopy and Structure
- Field-Flow Fractionation Techniques
- Iron and Steelmaking Processes
- Muon and positron interactions and applications
- Laser-induced spectroscopy and plasma
- Space Exploration and Technology
- Advanced ceramic materials synthesis
- Hydrocarbon exploration and reservoir analysis
University of Chicago
2012-2023
Field Museum of Natural History
2004
California Institute of Technology
2002
Russian Academy of Sciences
1986
A procedure was developed that allows precise determination of Fe isotopic composition. Purification achieved by ion chromatography on AG1-X8 strongly basic anion-exchange resin. No fractionation is associated with column chemistry within 0.02‰/amu at 2σ. The composition measured a Micromass IsoProbe multicollection inductively coupled plasma hexapole mass spectrometer. the Orgueil CI1 carbonaceous chondrite, which best approximates solar composition, indistinguishible from IRMM-014 (−0.005...
Abstract– Evaporation rates of K 2 O, Na and FeO from chondrule‐like liquids the associated potassium isotopic fractionation evaporation residues were measured to help understand processes conditions that affected chemical compositions olivine‐rich type IA IIA chondrules Semarkona. Both types show evidence having been significantly or totally molten. However, these do not have large systematic sort found in laboratory experiments. The experimental results reported here provide new data...
Moderately volatile elements (MVEs) are variably depleted in planetary bodies, reflecting the imprints of nebular and processes. Among MVEs, Na, K, Rb excellent tracers for unraveling history MVE depletion bodies because they have similar geochemical behaviors but can be chemically fractionated by evaporation condensation Furthermore, K amenable to high-precision isotopic analyses, which help constrain conditions condensation. To quantitatively understand why we carried out vacuum...
Abstract— Type B coarse‐grained calcium‐aluminum‐rich inclusions (CAIs) are the oldest known materials to have formed in solar system and a unique source of information regarding conditions processes protoplanetary disk around young sun. Recent experimental results on crystallization evaporation type B‐like silicate melts allow us place following constraints during formation CAIs. 1) Once CAIs precursors been condensed from composition gas, they were reheated at 1250–1450 °C, as is indicated...
In this study we report vaporization coefficients for silica, alumina, and molten anorthite gehlenite obtained by continuous weight loss measurements in a thermogravimetric system with tungsten mesh vacuum furnace. Free surface rates are measured using 2.5 mm droplets on Ir-wire loops. Vaporization were converted to partial pressures the Hertz-Knudsen-Langmuir equation. Where possible, equilibrium pressure determined iridium Knudsen cells addition model calculations. Silica alumina exhibit...