The Phase Boundary Between α- and β-Mg 2 SiO 4 Determined by in Situ X-ray Observation
- 26 August 1994
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 265 (5176) , 1202-1203
- https://doi.org/10.1126/science.265.5176.1202
Abstract
The stability of Mg2SiO4, a major constituent in the Earth's mantle, has been investigated experimentally by in situ observation with synchrotron radiation. A cubic-type high-pressure apparatus equipped with sintered diamond anvils has been used over pressures of 11 to 15 gigapascals and temperatures of 800° to 1600°C. The phase stability of α-Mg2SiO4 and β-Mg2SiO4 was determined by taking account of the kinetic behavior of transition. The phase boundary between α-Mg2SiO4 and β-Mg2SiO4 is approximated by the linear expression P = (9.3 ± 0.1) + (0.0036 ± 0.0002)T where P is pressure in gigapascals and T is temperature in degrees Celsius.Keywords
This publication has 9 references indexed in Scilit:
- Thermal properties of β‐Mg2SiO4 at mantle pressures derived from vibrational spectroscopy: Implications for the mantle at 400 km depthJournal of Geophysical Research, 1991
- Olivine‐modified spinel‐spinel transitions in the system Mg2SiO4‐Fe2SiO4: Calorimetric measurements, thermochemical calculation, and geophysical applicationJournal of Geophysical Research, 1989
- The system Mg2SiO4‐Fe2SiO4 at high pressures and temperatures: Precise determination of stabilities of olivine, modified spinel, and spinelJournal of Geophysical Research, 1989
- In situ observation of the olivine‐spinel phase transformation in Fe2SiO4 using synchrotron radiationJournal of Geophysical Research, 1987
- Kinetics of high-pressure phase transformations: Implications to the evolution of the olivine → spinel transition in the downgoing lithosphere and its consequences on the dynamics of the mantleTectonophysics, 1976
- High-Pressure Equation of State for NaCl, KCl, and CsClJournal of Applied Physics, 1971
- The system Mg2SiO4Fe2SiO4 at high pressures and temperaturesPhysics of the Earth and Planetary Interiors, 1970
- Split sphere high pressure vessel and phase equilibrium relation in the system Mg2SiO4Fe2SiO4Physics of the Earth and Planetary Interiors, 1970
- Olivine-spinel solid solution equilibria in the system Mg2SiO4-Fe2SiO4Journal of Geophysical Research, 1968