Volatile gas analysis released from simulated faults during frictional melting:

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  • Sato Keiko
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • Hirose Takehiro
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • Tamura Hajimu
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • Kumagai Hidenori
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • Mizoguchi Kazuo
    Earthquake Research Department, NIED

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  • experimental technique and preliminary results

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Frictional melting experiments were performed on fine grain homogeneous gabbroid with high temperatures induced by frictional heating using a high-velocity apparatus. We examined whether rapid fault movement can equilibrate fault rock gas with atmospheric components by measuring volatile gas and noble gas isotopes from a gabbroid sample using a quadrupole mass spectrometer to detect released gas from the simulated fault rock.<br>The anticipated rapid equilibration of volatiles during the frictional melting of rocks implies that the noble gas and volatile were released and mixed with the atmosphere during this experiment. Gases released from the sample were collected in a small aluminum tube in nitrogen atmosphere before and after the frictional melting experiment. The gas comprised carbon dioxide, water vapor, hydrogen, helium, and other noble gases. The He/Ar ratio and H2 concentration are higher than the pre-analysis of N2 atmosphere. This release of volatiles is consistent with the pseudotachylyte-like post experimental texture of specimen. It is also consistent with the co-seismic geochemical anomaly observed along a natural fault system.

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