HR: 16:30h
AN: MR54A-03    [Abstracts]
TI: Temperature Measurements and Melting of Shock-Compressed Minerals
AU: * Spaulding, D K
EM: dylanspaulding@berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science, UC Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720, United States
AU: Hicks, D G
EM: hicks13@llnl.gov
AF: Lawrence Livermore National Laboratories, Physics and Advanced Technologies, Livermore, CA 94550, United States
AU: Smith, R F
EM: smith248@llnl.gov
AF: Lawrence Livermore National Laboratories, Physics and Advanced Technologies, Livermore, CA 94550, United States
AU: Eggert, J H
EM: eggert1@llnl.gov
AF: Lawrence Livermore National Laboratories, Physics and Advanced Technologies, Livermore, CA 94550, United States
AU: McWilliams, R S
EM: rmcw@eps.berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science, UC Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720, United States
AU: McWilliams, R S
EM: rmcw@eps.berkeley.edu
AF: Lawrence Livermore National Laboratories, Physics and Advanced Technologies, Livermore, CA 94550, United States
AU: Collins, G W
EM: collins7@llnl.gov
AF: Lawrence Livermore National Laboratories, Physics and Advanced Technologies, Livermore, CA 94550, United States
AU: Jeanloz, R
EM: jeanloz@berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science, UC Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720, United States
AB: Laser-driven dynamic compression experiments permit exploration of material properties at pressures and temperatures spanning those encountered throughout the interiors of large rocky planets. Accurate experimental constraints on the melting of materials under these conditions have traditionally proven difficult to obtain, but are critically important to understanding interior dynamics. Here we report on absolute temperature measurements obtained with an optical pyrometer having high temporal resolution, <100ps, coupled to a kJ laser loading the sample with a 1-4 ns pulse at 527 nm wavelength. Temporally-resolved observations of the thermal emission from the shocked sample are collected with simultaneous pressure and optical reflectivity data to measure high- pressure melting. Results are discussed for a number of minerals relevant to the properties of the core-mantle boundary region, including α-quartz (SiO2) and fused silica, enstatite (MgSiO3), olivine ((Mg, Fe)2SiO4), and periclase (MgO). This work was performed under the auspices of the U.S. DOE by LLNL under Contract No. W-7405-ENG-48.
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
DE: 3944 Shock wave experiments
DE: 3994 Instruments and techniques
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting