Japan Geoscience Union Meeting 2014

Presentation information

Print

Oral

Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT40_1PM1] Geofluids: their distribution and role in the Earth's dynamics

Thu. May 1, 2014 2:15 PM - 4:00 PM 416 (4F)

Convener:*Michihiko Nakamura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Hiroshi Sakuma(Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology), Masahiro Ichiki(Graduate School of Science, Tohoku University), Tsutomu Takahashi(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Chair:Tetsuya Yokoyama(Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology), Keika Horiguchi(Crustal Fluid Research Group, The Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

2:15 PM - 2:30 PM

[SIT40-P09_PG] Development of high-precision geobarometer

3-min talk in an oral session

*Kohei TAKAHATA1, Junji TORIMOTO2, Junji YAMAMOTO2 (1.Earth and Planetary System Science, Hokkaido University, 2.Hokkaido University Museum)

Keywords:fluid inclusion, carbon dioxide, Raman spectroscopy, mantle xenolith, geobarometer

Fluid inclusions in mantle-derived minerals can serve as a messenger from deep Earth. If CO2 is a dominant phase of the fluid, the relationship between intensity ratio and frequency separation of the Fermi diad bands in the Raman spectra of CO2 can be used for determination of density of the inclusions. In this study, we installed new Raman spectrometer that was improved spectral resolution. And we also measured its precision of frequency separation (∆). As a result of this study, we determined that the error of ∆ is ± 0.003 cm-1 (1σ) . Converted into the error of density, this value is ± 0.0025 g / cm-1 .