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Ultrasonic observation of the calcite-aragonite transition

Ahrens, Thomas J. and Katz, Samuel (1963) Ultrasonic observation of the calcite-aragonite transition. Journal of Geophysical Research, 68 (2). pp. 529-537. ISSN 0148-0227. doi:10.1029/JZ068i002p00529.

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Elastic-wave velocities were measured as a function of pressure by ultrasonic pulse interferometry in Solenhofen and Manlius limestone specimens to pressures of 27 and 38 kb. Longitudinal velocities decrease sharply from 5.3 km/sec at a mean pressure of 4 kb to a minimum of 4.8 km/sec at 8 kb. Transverse velocities decrease from 3.1 to 2.9 km/sec. At the minimum, bulk and rigidity moduli are 25 and 10 per cent below their 4-kb values. A density increase of 1.7 per cent is associated with this minimum. The observed effects are attributed to the calcite-aragonite transition, and they may be due to an inherent property of the material, a major component of which undergoes a polymorphic transition, the low- and high-pressure phases coexisting over a considerable pressure range. This may be an additional mechanism to account for low-velocity zones in the earth's interior.

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Additional Information:Copyright 1963 by the American Geophysical Union. (Manuscript received July 23, 1962; revised October 24, 1962.) This research was supported in part by the National Science Foundation under grants G-5240 and G-9374, and by the National Aeronautics and Space Administration under grant NsG-100-60.
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Official Citation:Ahrens, T. J., and S. Katz (1963), Ultrasonic observation of the calcite-aragonite transition, J. Geophys. Res., 68(2), 529–537, doi:10.1029/JZ068i002p00529.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51504
Deposited By: George Porter
Deposited On:10 Nov 2014 20:53
Last Modified:10 Nov 2021 19:12

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