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Shock-induced devolatilization of calciteExperimental 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.
Document ID
19830034088
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Boslough, M. B.
(California Inst. of Tech. Pasadena, CA, United States)
Ahrens, T. J.
(California Inst. of Tech. Pasadena, CA, United States)
Vizgirda, J.
(California Inst. of Tech. Pasadena, CA, United States)
Becker, R. H.
(California Inst. of Tech. Pasadena, CA, United States)
Epstein, S.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 11, 2013
Publication Date
November 1, 1982
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 61
Issue: 1
Subject Category
Lunar And Planetary Exploration
Accession Number
83A15306
Funding Number(s)
CONTRACT_GRANT: NAS9-7944
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Other

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