JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

S (Solid Earth Sciences) » S-MP Mineralogy & Petrology

[S-MP41] [EE] Oceanic and Continental Subduction Processes

Mon. May 22, 2017 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:REHMAN Ur Hafiz(Department of Earth and Environmental Sciences, Graduate School of Science and Engineering, Kagoshima University), Tatsuki Tsujimori(Tohoku University), Chin Ho Tsai(National Dong Hwa University)

[SMP41-P01] Pressure estimation for diamond anvil cell under very-low pressures, hydrostatic conditions - re-evaluation for quartz Raman peak shifts -

*Kazuki Kubo1, Kazuaki Okamoto1 (1.Faculty of Education, Saitama University)

Pressure shift of the ruby R1 luminescent has been used as primary pressure gauge in diamond-anvil experiments. However, the pressure calibration under low-pressure conditions (<1 GPa) was poorly constrained although crustal hydrothermal experiments are important. For calibration of the R1 luminescent shifts at low-pressure conditions, we have done diamond anvils experiments at room temperature conditions. H2O and ethanol were used as pressure transmitting medium and all experimental pressures was below ice stability field keeping hydrostatic-pressure conditions. We could get well-constrained new calibration line. Our new pressure estimation based on the quartz Raman peaks gives lower pressures than that of previous experiments reported by Schmidt and Ziemann (2000). For example, it would give 0.6 GPa from our experimental study although the previous study estimated at 1 GPa. This discrepancy causes significant overestimates for residual pressures determined by quartz Raman analysis from the natural rocks.

Schmidt, C., and Ziemann, M.A., 2000, American Mineralogist, v. 85, p. 1725–1734.