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Solution and shock-induced exsolution of argon in vitreous carbon

Gazis, Carey and Ahrens, Thomas J. (1991) Solution and shock-induced exsolution of argon in vitreous carbon. Earth and Planetary Science Letters, 104 (2-4). pp. 337-349. ISSN 0012-821X. doi:10.1016/0012-821X(91)90214-3.

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Carbon has been shown by several researchers to be the main noble-gas carrier in chondritic meteorites. To add to our knowledge of noble gas solution and exsolution in carbonaceous material, experiments were performed on vitreous carbon, a type of amorphous carbon. Ar-rich vitreous carbon samples were prepared under vapor-saturated conditions using argon as the pressurizing medium. Solubility data were obtained for temperatures of 773 to 973K and pressures of 250 to 1500 bars. Up to 7 wt.% Ar was dissolved in the carbon. The solubility data were compared to a thermodynamic model of argon atoms dissolving into a fixed population of “holes” in the carbon. Two variations of the model yielded estimates of the enthalpy of solution of Ar in vitreous carbon (ΔH°_(Ar)) of ≈ −4700 cal/mole. Preliminary shock experiments showed that 28% of the total argon was released by driving 4 GPa^* shocks into the argon-rich carbon. It was demonstrated that shock-induced argon loss is not simply caused by the impact-induced diminution of grain size. The present value of shock pressure required for partial impact devolatilization of Ar from carbon is below the range (5–30 GPa) that H_2O is released from phyllosilicates.

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Additional Information:© 1991 Elsevier Science Publishers B.V. Received July 30, 1990; revision accepted February 22, 1991. Available online 23 October 2002. This work has profited greatly from the sound technical advice and generous use of laboratory facilities proffered by Professors E.M. Stolper and P.J. Wyllie. We also appreciate the generous assistance of Dr. Brent Dalrymple in his running standard samples in his U.S.G.S. laboratory. Research was supported by NASA under NAGW 1941, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, Contribution No. 4887.
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Caltech Division of Geological and Planetary Sciences4887
Issue or Number:2-4
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Official Citation:Carey Gazis, Thomas J. Ahrens, Solution and shock-induced exsolution of argon in vitreous carbon, Earth and Planetary Science Letters, Volume 104, Issues 2–4, June 1991, Pages 337-349, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50737
Deposited On:23 Oct 2014 18:46
Last Modified:10 Nov 2021 19:00

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