High‐pressure experiments and the phase diagram of lower mantle and core materials

@article{Boehler2000HighpressureEA,
  title={High‐pressure experiments and the phase diagram of lower mantle and core materials},
  author={Reinhard Boehler},
  journal={Reviews of Geophysics},
  year={2000},
  volume={38},
  pages={221 - 245}
}
  • R. Boehler
  • Published 1 May 2000
  • Geology
  • Reviews of Geophysics
The interpretation of seismic data and computer modeling requires increased accuracy in relevant material properties in order to improve our knowledge of the structure and dynamics of the Earth's deep interior. To obtain such properties, a complementary method to classic shock compression experiments and theoretical calculations is the use of laser‐heated diamond cells, which are now producing accurate data on phase diagrams, equations of state, and melting. Data on one of the most important… 

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References

SHOWING 1-10 OF 127 REFERENCES

MELTING TEMPERATURE OF THE EARTH'S MANTLE AND CORE: Earth's Thermal Structure

▪ Abstract Although the temperature at the top of the lower mantle is well constrained by phase equilibrium data for the transformation of transition zone minerals to the denser perovskite

Properties of iron at the Earth's core conditions

Summary. The phase diagram of iron up to 330 GPa is solved using the experimental data of static high pressure (up to 11 GPa) and the experimental data of shock wave data (up to 250 GPa). A solution

Temperatures in the Earth's core from melting-point measurements of iron at high static pressures

THE temperature distribution in the Earth's core places important constraints on the Earth's internal heat budget and on models of the geodynamo. The solid inner core crystallizes from a liquid outer

Earth's Core-Mantle Boundary: Results of Experiments at High Pressures and Temperatures

The experimental observations, in conjunction with seismological data, suggest that the lowermost 200 to 300 kilometers of Earth's mantle, the D" layer, may be an extremely heterogeneous region as a result of chemical reactions between the silicate mantle and the liquid iron alloy ofEarth's core.

Phase diagram of iron, revised‐core temperatures

Shock‐wave experiments on iron preheated to 1573 K from 14 to 73 GPa, yield sound velocities of the γ‐ and liquid‐phases. Melting is observed in the highest pressure (∼71 ± 2 GPa) experiments at

Shock temperatures of SiO2 and their geophysical implications

The temperature of SiO_2 in high-pressure shock states has been measured for samples of single-crystal α-quartz and fused quartz. Pressures between 60 and 140 GPa have been studied using projectile

Dynamical influences of high viscosity in the lower mantle induced by the steep melting curve of per

Recent experiments on the melting temperatures of perovskite have indicated a high melting temperature in the lower mantle. This suggests that a creep law with an activation enthalpy, that increases

Melting and crystal structure of iron at high pressures and temperatures

High‐pressure melting, phase transitions and structures of iron have been studied to 84 GPa and 3500 K with an improved laser heated diamond anvil cell technique and in situ high P‐T x‐ray

Constraints on the melting temperature of the lower mantle from high-pressure experiments on MgO and magnesioüstite

THE melting temperatures of minerals in the Mg–Fe–Si–O-system play a fundamental role in the chemical differentiation, rheology and geodynamics of the Earth's lower mantle. We have previously shown1

Phase transitions, Grüneisen parameter, and elasticity for shocked iron between 77 GPa and 400 GPa

Sound velocities determined in iron, shock compressed to pressures between 77 GPa and 400 GPa, indicate that two phase transitions exist on the Hugoniot. A discontinuity in sound velocities at 200 ±
...