A5006341965- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Astro and Planetary Science
- Planetary Science and Exploration
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Metallurgical Processes and Thermodynamics
- Glass properties and applications
- Hydrocarbon exploration and reservoir analysis
- Microstructure and Mechanical Properties of Steels
- Geochemistry and Geologic Mapping
- Clay minerals and soil interactions
- Mineralogy and Gemology Studies
- Methane Hydrates and Related Phenomena
- Nuclear materials and radiation effects
- Diamond and Carbon-based Materials Research
- Geomagnetism and Paleomagnetism Studies
- Geotechnical and Geomechanical Engineering
- Nuclear Physics and Applications
- Geological Studies and Exploration
- Advanced ceramic materials synthesis
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Chemical Thermodynamics and Molecular Structure
Tohoku University
2016-2025
Science Council of Japan
2021
V.S. Sobolev Institute of Geology and Mineralogy
2013-2018
Okayama Prefecture
2017
University of Niigata Prefecture
2017
Graduate School USA
2015-2016
Planetary Science Institute
2014-2015
Earth Science Institute of the Slovak Academy of Sciences
1987-2014
Russian Academy of Sciences
2013-2014
SUNY Geneseo
2011
The stability of Mg(2)SiO(4), a major constituent in the Earth's mantle, has been investigated experimentally by situ observation with synchrotron radiation. A cubic-type high-pressure apparatus equipped sintered diamond anvils used over pressures 11 to 15 gigapascals and temperatures 800 degrees 1600 C. phase alpha-Mg(2)SiO(4) beta-Mg(2)SiO(4) was determined taking account kinetic behavior transition. boundary between is approximated linear expression P = (9.3 +/- 0.1) + (0.0036 0.0002)T...
Research Article| January 01, 2005 Water in the Mantle Eiji Ohtani 1Institute of Mineralogy, Petrology, and Economic Geology, Tohoku University, Sendai 980-8578, Japan E-mail: ohtani@mail.tains.tohoku.ac.jp Search for other works by this author on: GSW Google Scholar Elements (2005) 1 (1): 25–30. https://doi.org/10.2113/gselements.1.1.25 Article history first online: 09 Mar 2017 Cite View This Citation Add to Manager Share Icon Facebook Twitter LinkedIn MailTo Tools Get Permissions Site...
Thermal expansion of γ-Mg2SiO4 was measured with X-ray powder diffraction method up to 750°C at atmospheric pressure. The data are analyzed in terms Gruneisen's theory thermal and parameter is obtained be 1.27. Volume coefficient 19 20°C 27 500°C unit 10-6/K. These values compared those γ-Fe2SiO4, MgAl2O4 other spinel type compounds, it suggested that the anharmonic properties γ-(Mg, Fe)2SiO4 may very close MgAl2O4.
Research Article| January 01, 2013 Solidus of alkaline carbonatite in the deep mantle Konstantin D. Litasov; Litasov 1Department Earth and Planetary Materials Science, Graduate School Tohoku University, Sendai 980-8578, Japan2V.S. Sobolev Institute Geology Mineralogy, SB RAS, Novosibirsk 630090, Russia Search for other works by this author on: GSW Google Scholar Anton Shatskiy; Shatskiy Eiji Ohtani; Ohtani Japan Gregory M. Yaxley 3Research Sciences, Australian National Canberra, ACT 0200,...
The melting and phase relations of carbonated MORB eclogite have been investigated using the multi-anvil technique at 9–21 GPa 1100–1900°C. starting compositions were two synthetic mixes, GA1 Volga, with CO2 component added as CaCO3 (cc): + 10%cc (GA1cc) models altered oceanic crust recycled into convecting mantle via subduction, Volga (Volga-cc) subducted that has lost some its siliceous in sub-arc regime (GA1 minus 6·5 wt % SiO2). subsolidus mineral assemblage 9 13 includes garnet,...
An overview of the recently renovated high-pressure X-ray diffraction (XRD) BL10XU beamline for diamond anvil cell at SPring-8 is presented. The renovation includes replacement source and monochromator, enhanced focusing systems high-energy XRD, recent progress in sample environment control techniques that are available studies. Other simultaneous measurement combination with such as Raman scattering spectroscopy Mössbauer spectroscopy, have been developed to obtain complementary information...
Hydrogen and deuterium isotopic evidence indicates that the source of terrestrial water was mostly meteorites, with additional influx from nebula gas during accretion. There are two Earth models, large (7–12 ocean masses) small (1–4 budgets can explain geochemical, cosmochemical, geological observations. Geophysical mineral physics data indicate upper lower mantles generally dry, whereas mantle transition zone is wetter, heterogeneous distribution. Subducting slabs a influx, there three...