TY - JOUR
T1 - Formation of SiH4 and H2O by the dissolution of quartz in H2 fluid under high pressure and temperature
AU - Shinozaki, Ayako
AU - Kagi, Hiroyuki
AU - Noguchi, Naoki
AU - Hirai, Hisako
AU - Ohfuji, Hiroaki
AU - Okada, Taku
AU - Nakano, Satoshi
AU - Yagi, Takehiko
N1 - Funding Information:
This study was supported by the G-COE program Deep Earth Mineralogy and the Sasakawa Scientific Research Grant from The Japan Science Society. A. Shinozaki was supported by a JSPS Research Fellowship for Young Scientists. This study was conducted under the Visiting Researcher’s Program of the Institute for Solid State Physics, The University of Tokyo. Synchrotron radiation experiments were performed at BL43IR of SPring-8, Japan, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2012B1104). We thank T. Moriwaki for supporting the FTIR measurements at BL43IR, SPring-8.
PY - 2014/7/1
Y1 - 2014/7/1
N2 - Species dissolved in H2 fluid were investigated in a SiO2-H2 system. Raman and infrared (IR) spectra were measured at high pressure and room temperature after heating experiments were conducted at two pressure and temperature conditions: 2.0 GPa, 1700 K and 3.0 GPa, 1500 K. With the dissolution of quartz, a SiH vibration mode assignable to SiH4 was detected from Raman spectra of the fluid phase. Furthermore, an OH vibration mode was observed at 3260 cm-1 from the IR spectra at 3.0 GPa. With decreasing pressure, the OH vibration frequencies observed between 3.0 and 2.1 GPa correspond to that of ice VII, and those observed at 1.4 and 1.1 GPa correspond to that of ice VI. These results indicate that the chemical reaction between dissolved SiO2 components and H2 fluid caused the formation of H2O and SiH4, which was contrastive to that observed in SiO2-H2O fluid. Results imply that a part of H2 is oxidized to form H2O when SiO2 components of mantle minerals dissolve in H2 fluid, even in an iron-free system.
AB - Species dissolved in H2 fluid were investigated in a SiO2-H2 system. Raman and infrared (IR) spectra were measured at high pressure and room temperature after heating experiments were conducted at two pressure and temperature conditions: 2.0 GPa, 1700 K and 3.0 GPa, 1500 K. With the dissolution of quartz, a SiH vibration mode assignable to SiH4 was detected from Raman spectra of the fluid phase. Furthermore, an OH vibration mode was observed at 3260 cm-1 from the IR spectra at 3.0 GPa. With decreasing pressure, the OH vibration frequencies observed between 3.0 and 2.1 GPa correspond to that of ice VII, and those observed at 1.4 and 1.1 GPa correspond to that of ice VI. These results indicate that the chemical reaction between dissolved SiO2 components and H2 fluid caused the formation of H2O and SiH4, which was contrastive to that observed in SiO2-H2O fluid. Results imply that a part of H2 is oxidized to form H2O when SiO2 components of mantle minerals dissolve in H2 fluid, even in an iron-free system.
KW - Dissolution
KW - H-HO fluid
KW - IR
KW - Laser-heated diamond-anvil cell
KW - Raman
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U2 - 10.2138/am.2014.4798
DO - 10.2138/am.2014.4798
M3 - Article
AN - SCOPUS:84907972200
SN - 0003-004X
VL - 99
SP - 1265
EP - 1269
JO - American Mineralogist
JF - American Mineralogist
IS - 7
ER -