An Exploratory Study of the Viscoelasticity of Phase-Transforming Material
Attenuation and modulus dispersion are typically associated with shear stress and strain. Time-dependent volume changes accompanying pressure variations can give rise to bulk modulus attenuation and dispersion. Phase transformations in a two-phase region are candidates for such phenomena. Here we report laboratory data that are consistent with bulk modulus softening as pressure is cycled in a region of coexisting olivine and spinel. We use Fay70For30 olivine as our sample. Experiments are performed in a multi-anvil high-pressure apparatus (Deformation DIA) using synchrotron (NSLS) X-ray radiation as the probing tool. Pressure is up to 12 GPa and temperature is up to 1450 C. Measurements were carried out within the binary loop where the olivine and spinel phases coexist. We apply a uniaxial oscillation stress onto the sample and Young's modulus and Q{sup -1} are measured at frequencies of 0.1-0.01 Hz. Our results indicate that the sinusoidal force applied to the sample in olivine-ringwoodite region has much lower bulk modulus and higher Q{sup -1} than in the single-phase regions. Our data are consistent with the diffusion controlled model of (Jackson, I., 2007. Physical origins of anelasticity and attenuation in rock, In: Price, G.D. (Ed.) Mineral Physics. Treatise On Geophysics. Elsevier), where the characteristic time decreases with decreasing strain.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 980009
- Report Number(s):
- BNL-92927-2010-JA; PEPIAM; TRN: US1005393
- Journal Information:
- Physics of the Earth and Planetary Interiors, Vol. 174, Issue 1-4; ISSN 0031-9201
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
04 OIL SHALES AND TAR SANDS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ATTENUATION
DEFORMATION
DIFFUSION
DISPERSIONS
GEOPHYSICS
MATERIALS
MINERALS
NSLS
OLIVINE
OSCILLATIONS
PHASE TRANSFORMATIONS
PHYSICS
PRESSURE RANGE MEGA PA 10-100
RADIATIONS
RISE
SHEAR
SPINELS
SYNCHROTRONS
VARIATIONS
VOLUME
national synchrotron light source