ฝัง
- เผยแพร่เมื่อ 6 ก.พ. 2025
- Title: Elastic wave velocity measurements at high pressure and high temperature and its applications to the study of Earth’s interior
Abstract: Laboratory studies of the elastic wave velocities of minerals under high pressure plays a major role in enabling scientists to interpret seismic observations in term of composition and structure of the Earth’s deep mantle. While such studies show that the origin of positive seismic discontinuities are mostly attributed to phase transitions, temperature variations and mineral composition of mantle rocks, the origin of anomalous zones, with low seismic velocities remain much less understood.
Here I will review technical advances in laboratory measurements of P- and S-wave velocities of mantle minerals and rock aggregates under simultaneous high-pressure and high-temperature using ultrasonic interferometry and the multi-anvil apparatus. Then, I will present new developments for these techniques that allow for investigating the effect of partial melting on the seismic velocities of mantle rocks, and discuss how those data can be used to investigate anomalous seismic zones in the Earth’s mantle transition zone.
