| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
|---|
| Research Abstract |
A method to quantify water content in small volcanic glasses has been developed. The technique uses Fourier transform infrared (FT-IR) micro reflectance spectroscopy, and thus does not require a doubly polished sample. For standards, we synthesized 32 glasses with different water concentrations ranging from basaltic to rhyolitic composition. An empirical relationship was established between total water contents and the negative peak heights of reflectance spectra. To apply the technique to natural samples of various shapes, we developed a method to correct the spectrum of melt inclusion contaminated with host minerals. As a result, the water content now can be quantified with reasonable accuracy (< 0.3 wt%) for melt inclusions having diameter as small as 20 micron with a typical measuring time of 22 min.
|
