Research progress on the electrical and elastic properties of minerals under high temperature and high pressure in geochemistry

In-situ high-temperature and high-pressure mineral rock electrical conductivity and elastic wave velocity for earth scientists to explore the Earth and planets internal material composition, structure and structure, temperature distribution, partial melting, water content, redox state, point defect chemistry, chemical element migration, electronic self Rotational shifts provide extremely important information.

For many years, the research group of Li Ping of the Institute of Geochemistry at the Institute of Geochemistry of the Chinese Academy of Sciences has devoted himself to the research work in this area and has made important progress.

Under the guidance of researcher Li Heping, the research team members Dai Lidong, Hu Haiying and other typical mineral rocks in the crust and upper mantle: Al-rich garnet (Alm82Py15Grs3), single crystal San Carlos olivine and granite, and lower mantle minerals Calcium ferrite phase (NAL and CF of Na0.4Mg0.6Al1.6Si0.4O4) as an example, adopted in this laboratory, Department of Geology and Geophysics, Yale University, USA, and School of Earth and Planetary Sciences, Tokyo Institute of Technology, Japan. Large-scale presses and high-temperature and high-pressure equipment in the diamond pressure chamber, combined with Japanese SPring-8 and two-sided CO2 lasers in the world's largest national laboratory for simultaneous light sources, conduct in-situ measurement of conductivity and Brillouin scattering elastic wave velocity. Pressure, oxygen partial pressure, and phase transition have important influences on the physical properties of minerals. This result can provide important experimental results and scientific basis for the establishment of conductivity-depth and elastic wave-depth profiles of deep matter in the earth.

This work was supported by the "135" Project of the Institute of Geochemistry of the Chinese Academy of Sciences, the "Academy 100" Program of the Chinese Academy of Sciences, and the National Natural Science Foundation of China. Some of the results were funded by the Japan Society for the Promotion of Science's Foreign Fellowship Fund and the US Natural Science Foundation.

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