Elastic Softening of Peridotite Due to the Presence of Melt Phases at High Pressure
Here we report an observation of softening of Young's modulus of a sample of KLB-1 peridotite as a metallic Ni melt intruded into it at 2.5 GPa and about 1500 C. A uniaxial oscillation of stress was applied to the sample with frequency of 0.01-0.02 Hz and an amplitude up to 500 MPa. The Young's modulus is measured as the amplitude ratio between the sample and a reference material, while the attenuation is determined by the phase angle delays. The Ni intrusion was captured by in situ X-ray radiography. A planar intrusion occurred gradually, but advanced only during the extension; eventually, the Ni melt dissected the sample on a plane normal to the extension axis. Accompanied softening of Young's modulus was observed after the Ni intrusion was completed. This study suggests that percolation of a liquid metallic phase is possible within a partially melted mantle rock in the presence of a differential stress field.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 980175
- Report Number(s):
- BNL--93093-2010-JA
- Journal Information:
- Physics of the Earth and Planetary Interiors, Journal Name: Physics of the Earth and Planetary Interiors Vol. 170; ISSN 0031-9201; ISSN PEPIAM
- Country of Publication:
- United States
- Language:
- English
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