SILICA SPECIATION IN AQUEOUS FLUIDS AT HIGH PRESSURES AND HIGH TEMPERATURES
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dc.contributor.author | Zotov N. | |
dc.contributor.author | Keppler H. | |
dc.date.accessioned | 2021-04-15T02:18:26Z | |
dc.date.available | 2021-04-15T02:18:26Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=910760 | |
dc.identifier.citation | Chemical Geology, 2002, 184, 1-2, 71-82 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27831 | |
dc.description.abstract | In-situ Raman measurements of silica speciation in aqueous fluids in equilibrium with solid quartz are reported to 14 kbar and 900 °C. Silica speciation in the fluid depends strongly on temperature and pressure. The Raman spectra indicate that below 600 °C and 6-8 kbar, only H4SiO4 monomers are present, while H4SiO4 monomers and H6Si2O7 dimers coexist at higher temperatures and pressures. Above temperatures of about 850-900 °C and pressures of 12-13 kbar higher polymers may be present in significant concentrations. The enthalpy of the polymerization reaction 2H4SiO4#H6Si2O7+H2O at 5 kbar pressure is ΔH=12.6+/-1.3 kJ/mol, while the reaction entropy is ΔS=40.7+/-1.3 J/mol K. The change of the molar volume of the solute ΔVsol=VH6Si2O7-2VH4SiO4 is virtually constant over the pressure and temperature range studied and equal to -39+/-14 cm3/mol. | |
dc.subject | SILICA SPECIATION | |
dc.subject | AQUEOUS FLUIDS | |
dc.subject | DIAMOND-ANVIL CELL | |
dc.subject | SOLUBILITY | |
dc.subject | RAMAN SPECTROSCOPY | |
dc.subject | HIGH PRESSURE | |
dc.title | SILICA SPECIATION IN AQUEOUS FLUIDS AT HIGH PRESSURES AND HIGH TEMPERATURES | |
dc.type | Статья |
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