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Shigeru Yamashita's

Reseach Interests

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Current Research Interests

Thermodynamics of water solubility in silicate melts under pressures

Isentropic rise path of a water oversaturated magma body

Vibrational spectroscopy of water-bearing silicate glasses

The major area of my interest is experimental investigation of magmatic processes, with a specific interest in the role of volatile components such as water. My current concern is water-oversaturation phenomenon in a rising magma body. Water is a major volatile component dissolved in magma at depth (up to 4-5 wt% or 10 mol% at 100 MPa), and is capable of nearly complete escape from the melt (but being sustained as vapor bubbles) when the magma rises to near the surface. Such a phenomenon promotes a major change in the energetic properties of the system. My research will help in fully quantifying the energetic effects of water oversaturation in a magmatic melt, which thereby makes it possible to describe the P-V-T evolution of a rising water-oversaturated magma body as a simple continuum problem. This will provide a rigorous petrological base for better understanding the dynamics of magma migration beneath volcanoes.

Recent Publications

  1. Yamashita, S., Tatsumi, Y. and Nohda, S. (1996). Temporal variation in primary magma compositions in the northeast Japan Arc. Island Arc 5, 276-288.
  2. Yamashita, S., Kitamura, T. and Kusakabe, M. (1997). Infrared spectroscopy of hydrous glasses of arc magma compositions. Geochemical Journal 31, 169-174.
  3. Yamashita, S. (1999). Experimental study of the effect of temperature on water solubility in natural rhyolite melt to 100 MPa. Journal of Petrology 40, 1497-1507.
  4. Ogo, Y. and Yamashita, S. (1999). Preparation of thin glass wafer for infrared spectroscopy. Bulletin of Volcanological Society of Japan 44, 251-254 (in Japanese).

<Reprint Request> Please mail to: shigeru@misasa.okayama-u.ac.jp

Link to: Shigeru Yamashita's Resources

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