Dynamic compression and volatile release of carbonates

Details Dynamic compression and volatile release of carbonates Dynamic compression and volatile release of carbonates

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4730t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 10, 1986, p. 4730-4744. Previously announced in STAR as N85-125

Physics

39

Carbonates, Compression Waves, Particle Motion, Releasing, Velocity, Volatility, Atmospheric Models, Dynamic Characteristics, Electromagnetic Measurement, Limestone, Polycrystals, Seismographs

Scientific paper

Particle velocity profiles upon shock compression and isentropic releases were measured for polycrystalline calcite. The Solenhofen limestone release paths lie close to the Hugoniot. Calcite 3 to 2 transition, upon release was observed, but rarefaction shocks were not detected. The equation of state is used to predict the fraction of material devolatilized upon isentropic release as a function of shock pressure. The effect of ambient partial pressure of CO2 on the calculations is demonstrated and considered in models of atmospheric evolution by impact induced mineral devolatilization. The radiative characteristics of shocked calcite indicate that localization of thermal energy occurs under shock compression. Shock entropy calculations result in a minimum estimate of 90 percent devolatilization upon complete release from 10 GPa. Isentropic release paths from calculated continuum Hugoniot temperatures cross into the CaO (solid) + CO2 (vapor) field at improbably low pressures. It is found that release paths from measured shock temperatures cross into the melt plus vapor field at pressures greater than .5 GPa, which suggests that devolatilization is initiated at the shear banding sites.

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