13th GRC International Frontier Seminar

LABORATORY MEASUREMENTS ON ELASTICITY ON EARTH MATERIALS AT HIGH PRESSURE AND TEMPERATURE

Assist. Prof. JENNIFER KUNG
Department of Earth Sciences National Cheng-Kung University, Tainan, Taiwan

　 Elastic wave velocity measurements on mantle minerals and rocks provide the data for direct comparison with seismic observations and deductions about the structure and composition of the Earth's interior. In the last decade, considerable progress has been achieved in conducting acoustic velocity measurements at high pressures and temperatures using multi-anvil, high-pressure apparatus. Using combined synchrotron radiation and ultrasonic velocity measurements, simultaneous measurements of sound wave velocities, structure and unit cell parameters, stress, and sample length at high pressure and temperature have extended experimental capabilities in multi-dimensions for a complete characterization of solid materials to the pressure of P ~ 22 GPa and T > 1500K. Sample length and stress conditions at high pressure and high temperature can be quantitatively addressed in these experiments using X-radiography and multi-element detectors. These are especially applicable to the study of elastic properties of materials undergone phase transition, melting, and plastic deformation, or multi-phase aggregate (mantle rocks) at high pressure and temperature, in which the sample length can not be retrieved from other techniques. These combined measurements not only provide the determination of pressure derivatives of elastic moduli without using a secondary pressure standard, but also can be used to establish an absolute pressure scale. The full capacity of the multi-faceted measurements described above will be illustrated with data on Earth materials. 　

　

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主催：愛媛大学地球深部ダイナミクス研究センター