Physics – Condensed Matter
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..shk.j5005g&link_type=abstract
American Physical Society, Shock Compression of Condensed Matter Meeting, June 24-29, 2001 Renaissance Waverly Hotel, Atlanta, G
Physics
Condensed Matter
Scientific paper
The possible mineral composition, thermal structure of the Earth's inter ior and the impacting effects of the Earth's surface were investigated by using shock wave experiments through Hugoniot equation of state, sound velocity and sh ock temperature and melting measurements of candidate geological materials. (1) The experiments of enstatite (Mg_0.92, Fe_0.08)SiO3 with perovskite st ructure at pressure up to 140GPa shows that: the relation between shock wave vel ocity D and particle velocity u of our enatatite sample is confirmed: D=5.13+1.2 u. The dependence of the compressional sound velocity νP (Km /s) measured using the optical analyzer techniques on Hugoniot pressure P(GPa) can be described by: . The temperature coefficients of sound velocity of perovskite-enstatite under high pressure were obtained, in terms of the definition of sound velocity and Th ermodynamics.The shock temperature of perovskite (Mg_0.92, Fe_0.08)SiO3 has been measured using a high sensitivity transient optical pyrometer up to 140 GPa. The shock temperature increase continuously with pressure from 3319±160K at 46 GPa to 8272±420K at 140 GPa without knee. In term of these basic data, a fully new mineralogy model of lower mantle is proposed and the lateral thermal heterogenei ty in lower mantle is discussed. (2) Basing on shock wave experiments data of Nandan iron meteorite (60 ~300 GPa), we suggested that the possible composition of the outer core is: Fe82.07%, Ni6. 16%, S6.73%, O5.04%(wt.). The temperature at the boundary of the core-mantle (co re side), inner-outer core, and the centre of the core are 4300K, 5850±200 K and 6020±200 K, respectively. (3) Shock induced phase transitions and dehydration of halloysite were measured and the results shows that halloysite may be stable at dept about 50 Km in uppe r mantle or as a transient phase in subducting slabs at depth of about 130 Km. I mpact crater and shock metamorphism of quartz sandstone were also studied.
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