HR: 1340h
AN: MR43C-1521    [Abstracts]
TI: Brillouin Spectroscopy at the GeoForschungsZentrum-Potsdam: Applications in Geosciences and Materials Science
AU: * Marquardt, H
EM: hama@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany
AU: Speziale, S
EM: speziale@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany
AU: Reichmann, H J
EM: hanni@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany
AU: Schmidt, C
EM: hokie@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany
AU: Schilling, F
EM: fsch@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany
AB: Knowledge of the elastic properties of earth materials at relevant pressures and temperatures is prerequisite to adequately interpret seismic data and improve our understanding of the composition and mineralogy of the earth's interior. The study of pressure and temperature dependence of acoustic velocity in geo-fluids gives us information about their density with implications for the thermodynamic modelling of diagenetic and metamorphic processes. Furthermore elasticity of synthetic materials is of major interest for several industrial applications. We have recently completed the construction of a new Brillouin System at the GeoForschungsZentrum Potsdam. The new system has been designed to study elasticity of various geological as well as industrial materials at different pressure and temperature conditions. Our Brillouin system consists of a Nd:YVO₄ solid state laser operating at a wavelength of 532 nm as light source and a Sandercock-type tandem multipass Fabry-Perot interferometer equipped with a photomultiplier tube for signal detection. Measurements can be performed in 60 or 90 degree symmetric forward scattering or in backscattering geometry. The large positioning system also allows for high temperature measurements in an externally heated diamond anvil cell. We present first results of elasticity measurements both on Earth's materials, such as silicates garnets and oxides, as well as hydroxides and commercially used garnet aluminates, and silicate and borate glasses as proxies for melts. Brillouin scattering has been measured to constrain the density of water-NaCl solutions, for the precise thermodynamic modelling of fluids in metamorphic systems.
DE: 3909 Elasticity and anelasticity
DE: 3919 Equations of state
DE: 3994 Instruments and techniques
DE: 3999 General or miscellaneous
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting