Formation of SiH4 and H2O by the dissolution of quartz in H2 fluid under high pressure and temperature
説明
Species dissolved in H 2 fluid were investigated in a SiO 2 –H 2 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 SiH 4 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 SiO 2 components and H 2 fluid caused the formation of H 2 O and SiH 4 , which was contrastive to that observed in SiO 2 –H 2 O fluid. Results imply that a part of H 2 is oxidized to form H 2 O when SiO 2 components of mantle minerals dissolve in H 2 fluid, even in an iron-free system.
収録刊行物
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- American Mineralogist
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American Mineralogist 99 (7), 1265-1269, 2014-07-01
Mineralogical Society of America
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詳細情報 詳細情報について
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- CRID
- 1360567188358449280
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- ISSN
- 0003004X
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
