Shock-compressed MgSiO3glass, enstatite, olivine, and quartz: Optical emission, temperatures, and melting
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چکیده
منابع مشابه
Shock and post-shock temperatures in an ice–quartz mixture: implications for melting during planetary impact events
a r t i c l e i n f o Keywords: shock temperature impact cratering melting water ice equation of state Melting of H 2 O ice during planetary impact events is a widespread phenomenon. On planetary surfaces, ice is often mixed with other materials; yet, at present, the partitioning of energy between the components of a shocked mixture is still an open question in the shock physics community. Know...
متن کاملAtomistic molecular dynamics simulations of shock compressed quartz.
Atomistic non-equilibrium molecular dynamics simulations of shock wave compression of quartz have been performed using the so-called BKS semi-empirical potential of van Beest, Kramer, and van Santen [Phys. Rev. B 43, 5068 (1991)] to construct the Hugoniot of quartz. Our scheme mimics the real world experimental set up by using a flyer-plate impactor to initiate the shock wave and is the first s...
متن کاملElectrical and optical measurements on fused quartz under shock compression
The resistivities of specimens of Si02 (fused quartz) singly and doubly shocked in the i0 to 45 and 27 to 90 GPa range, respectively, demonstrate a marked decrease from values of ~10~'m to ~0.1~'m at single shock pressure of ~40 and double shock pressure of ~74 GPa. The shock-induced polarization profiles also show a sudden change of electrical properties of the material at those pressures. The...
متن کاملTHE SYSTEM DIOPSIDE – FORSTERITE – ENSTATITE AT 5.1 GPa: A TERNARY MODEL FOR MELTING OF THE MANTLE¶
Data determined using a multianvil press are given for liquidus phase relations in the system diopside – forsterite – enstatite (CaMgSi2O6 – Mg2SiO4 – MgSiO3) and extend for a limited distance into the larger ternary system diopside – forsterite – quartz at 5.1 GPa. In the system diopside–enstatite, which cuts across the system diopside – forsterite – quartz and divides it into two smaller tern...
متن کاملShock Temperatures in Silica Glass: Implications for Modes of Shock-induced Deformation, Phase Transformation, and Melting with Pressure
Gray body temperatures and emittances of silica glass under shock compression between 10 and 30 GPa are determined. Observed radiative temperatures are higher than computed continuum temperatures for shockcompressed silica glass; however, below -26 GPa observed emittances are <0.02. This suggests that fused quartz deforms heterogeneously in this shock pressure range as has been observed in othe...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 2004
ISSN: 0148-0227
DOI: 10.1029/2003jb002860