R6: Plutonic rocks, volcanic rocks and subduction factory

[R6P-01] Improved accuracy of micro-Raman mass spectrometry for carbon isotopic composition of carbon dioxide fluid

「発表賞エントリー」

*Lena Yokokura¹, Yuuki Hagiwara¹, Junji Yamamoto² (1. Hokkaido Uni. Sci., 2. The Hokkaido Uni. Museum)

Keywords:Raman spectroscopy, CO2 fluid, carbon isotopic ratio, fluid inclusion

We investigated fluctuation of the Raman intensity ratios and area ratio of peaks of ¹³CO₂ to ¹²CO₂ by changing fluid pressure. When changing fluid pressure, from 10 MPa to 150 MPa. To evaluate the effect of the peak shift on Raman intensity ratio, which is induced by changing fluid pressure, we conducted repeated measurements of intensity ratio with moving the grating center, which is defined as the center value of analyzing wave number range, at constant fluid pressure, 10 MPa.