Shock-induced devolatilization of calcite |
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Authors: | Mark B Boslough Thomas J Ahrens Joana Vizgirda Richard H Becker Samuel Epstein |
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Institution: | Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 U.S.A. |
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Abstract: | The amounts of CO2 and CO evolved upon shock compression and decompression of calcite to 18 GPa (180 kbar) have been determined using a new gas phase shock recovery technique and gas source mass spectrometry. The data demonstrate that from ~0.03 to 0.3 mole percent of calcite is devolatilized at shock pressures significantly lower than those predicted (30 GPa) for the onset of volatilization by continuum thermodynamic theory and are in qualitative agreement with release adiabat data for calcite and aragonite. Carbon and oxygen isotope ratios in the shock-released CO2 are the same as those in the unshocked (hydrothermal) calcite, demonstrating that the CO2 comes from the calcite rather than other potential sources. |
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