A5073852028- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Electron and X-Ray Spectroscopy Techniques
- Advanced Materials Characterization Techniques
- Catalysis and Oxidation Reactions
- earthquake and tectonic studies
- Planetary Science and Exploration
- Metallurgical Processes and Thermodynamics
- Ion-surface interactions and analysis
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Advanced Chemical Physics Studies
- Marine and environmental studies
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Diamond and Carbon-based Materials Research
- Metal Alloys Wear and Properties
- Geomagnetism and Paleomagnetism Studies
- Magnesium Oxide Properties and Applications
- Thermal Expansion and Ionic Conductivity
- Metal-Catalyzed Oxygenation Mechanisms
- Research Data Management Practices
- Methane Hydrates and Related Phenomena
Pennsylvania State University
2017-2022
Millennium Engineering and Integration (United States)
2017
Geophysical Laboratory
2012-2015
Carnegie Institution for Science
2012-2015
Case Western Reserve University
2008-2012
Research Article| January 01, 2010 Diffusion in Oxides James A. Van Orman; Orman 1Department of Geological Sciences, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 U.S.A., james.vanorman@case.edu2Department Chemical Engineering, U.S.A. Search for other works by this author on: GSW Google Scholar Katherine L. Crispin james.vanorman@case.edu Author and Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 © The Of Reviews Mineralogy...
We have studied two samples of mantle diamond containing iron carbide inclusions from Jagersfontein kimberlite, South Africa. Syngenetic crystal growth is inferred using morphological characteristics. These provide an opportunity to investigate the isotopic partitioning 13C in a terrestrial natural high-pressure and high-temperature (HPHT) system. The difference for δ13C values between coexisting averaged 7.2 ± 1.3‰. data are consistent with available literature showing be 13C-depleted...
Double stage diamond anvil cells (DACs) of two designs have been assembled and tested. We used a standard symmetric DAC with flat or beveled culets as primary CVD microanvils machined by focused ion beam second. evaluated pressure, stress, strain distributions in gold mixture iron well secondary anvils using synchrotron x-ray diffraction micro-focused beam. A maximum pressure 240 GPa was reached independent the first culet size. found that stress field generated second is typical...
Knowledge of Fe composition in lower-mantle minerals (primarily perovskite and ferropericlase) is essential to a complete understanding the Earth's interior. cation diffusion potentially controls many aspects distribution lower mantle, including mixing chemical heterogeneities, element partitioning, extent core-mantle communications. ferropericlase has been shown undergo spin transition starting at about 40 GPa exists mixture high-spin low-spin states over wide range pressures. Present...
Abstract Ocean basins are formed when continents broken apart. Adiabatic melt generation that is driven by rifting of continental lithosphere strongly dependent on the rate extension. Slow extension results in conductive heat loss from upwelling mantle, whereas cooling limited during fast and can result geotherm intersecting peridotite solidus. However, there few direct constraints rates mantle lithosphere. Here we use diffusion modeling subsolidus REE re‐equilibration between orthopyroxene...
Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.
Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – 8, 2013.
Crystal Geyser (Utah, USA) is a CO2-rich low-temperature geyser that studied as natural analog for CO2 leakage from carbon capture and storage (CCS) sites. In order to better constrain the biogeochemical processes influencing CaCO3 precipitation at geological escape sites, we characterized fast-forming iron-rich calcium carbonate pisoids travertines precipitating fluids expelled by geyser. The pisoids, located within few meters vent, are composed of concentric layers aragonite calcite....
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Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.