Ultrasonic observation of the calcite-aragonite transition
- Creators
- Ahrens, Thomas J.
- Katz, Samuel
Abstract
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.
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.Attached Files
Published - jgr3321.pdf
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Additional details
- Eprint ID
- 51504
- Resolver ID
- CaltechAUTHORS:20141110-111613014
- G-5240
- NSF
- G-9374
- NSF
- NsG-100-60
- NASA
- Created
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2014-11-10Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field