Statut | Confirmé |
Série | SEM-BESSON |
Domaines | cond-mat |
Date | Lundi 19 Novembre 2012 |
Heure | 10:30 |
Institut | IMPMC |
Salle | salle de conférence, tour 22-23, 4 eme etage, UPMC, 4,place Jussieu |
Nom de l'orateur | Murakami |
Prenom de l'orateur | Motohiko |
Addresse email de l'orateur | |
Institution de l'orateur | Tohoku University, Sendai |
Titre | Sound velocities of earths deep materials |
Résumé | Average composition and structure of the Earths deep interior can be approached by comparing observed seismic velocities to appropriate laboratory data collected for candidate materials under relevant conditions. Precise knowledge of the elastic properties of Earths deep materials under high-pressure condition is therefore crucial for constructing the accurate mineralogical model of the Earths deep interior. Recent technical advances in high-pressure Brillouin spectroscopic measurements combined with diamond anvil cell apparatus (DAC) extended significantly the upper pressure limit for acoustic measurements and also enable us to explore the sound velocities under high-pressure and high-temperature conditions using infrared laser heating technique. Here we present the recent progress of elastic wave velocity measurements on Earths deep materials by Brillouin spectroscopy in a DAC in conjunction with synchrotron X-ray diffraction technique under ultrahighpressures. Based on the results we have recently obtained on mantle minerals and glass materials, the mineralogy of deep mantle and the structure of the silicate melt at the base of the mantle will be discussed. |
Numéro de preprint arXiv | |
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