Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2293u&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 11, p. 2293-2296
Physics
6
Mineral Physics: Elasticity And Anelasticity, Physical Properties Of Rocks, Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: Thermal Properties
Scientific paper
We have measured qualitative elastic properties of basalt and Berea sandstone from room temperature down to 4 K using Resonant Ultrasound Spectroscopy (RUS). A simple elastic solid should show a monotonic increase in the elastic constants as temperature decreases. The basalt samples show this gross behavior while the sandstone shows a very unexpected anomalous regime between 40 K and 200 K where the elastic constants decrease with decreasing temperature. Both rocks show temperature-dependent structure in both the modulus and internal friction, and also significant hysteresis, indicating history and rate-dependent properties. This data provides insight into the time and energy scales of dynamical effects observed in sandstones. The low temperature range (4K-300K) is of interest due to the renewed interest in Mars and Lunar rocks.
Darling T. W.
Ulrich T. J.
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