Computer Science
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..61..166b&link_type=abstract
Earth and Planetary Science Letters, vol. 61, no. 1, Nov. 1982, p. 166-170.
Computer Science
32
Calcite, Gas Evolution, Planetary Atmospheres, Shock Loads, Terrestrial Planets, Vaporizing, Atmospheric Composition, Carbon Dioxide, Carbon Monoxide, Electron Paramagnetic Resonance, Gas Analysis, Impact Loads, Isotopes, Planetary Evolution
Scientific paper
Experimental measurements of the release adiabats by Vizgirda (1981) indicate that substantial vaporization takes place upon release from shock pressures of 37 GPa for calcite and 14 GPa for aragonite. The present investigation includes the first controlled partial vaporization experiments on calcite. The experiments were conducted to test the predictions of the release adiabat experiments. The quantities of the gaseous species produced from shocked calcite and their carbon and oxygen isotopic compositions were determined, and the shock-induced effect on the Mn(2+) electron spin resonance spectrum in the shock-recovered calcite was observed. On the basis of the obtained results, it is concluded that shock stresses at the 17-18 GPa level give rise to volatilization of 0.03-0.3 (mole) percent of calcite to CO2 and CO. The devolatilization of calcite occurs at low pressure at significantly lower entropy densities than predicted on the basis of thermodynamic continuum models.
Ahrens Thomas J.
Becker Robert H.
Boslough Mark B.
Epstein Samuel
Vizgirda Joana
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