Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 9, Pages 3210-3217Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063195
Keywords
coseismic fluid-rock interaction; thermal pressurization; frictional heating; frictional experiment
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Funding
- Japan Society for the Promotion of Science (JSPS) [25800284, 21107004, 24340127]
- Grants-in-Aid for Scientific Research [15H03737, 25800284] Funding Source: KAKEN
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Friction experiments at high velocities (0.1 to 0.4m/s) at room temperature under high pore fluid pressures (2 or 5MPa) and trace element analyses of the run products were carried out on simulated fault gouge derived from the Chelungpu fault, Taiwan. The friction coefficient decreased to similar to 0.1 during sliding, and the slip surface temperature reached 300 degrees C by 6m of slip displacement. The slip caused a small, but distinct decrease of Li in the deformed gouge when the slip surface temperature exceeded 300 degrees C. The observed Li depletion agreed with calculated results, indicating that it resulted from a hydrothermal reaction at a high temperature produced by short-duration (up to 40s) frictional heating. The geochemical data suggest a small fluid/rock ratio and low reaction temperature in the simulated fault, which is explained by higher normal stress or repeated earthquakes which elevated fluid-rock ratios in the natural fault.
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