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Structure and equilibria among silicate species in aqueous fluids in the upper mantle: Experimental SiO2-H2O and MgO-SiO2-H2O data recorded in situ to 900 degrees C and 5.4GPa
Mysen, B. O.1; Mibe, K.2; Chou, I. -M.3; Bassett, W. A.4
2013-12-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume118Issue:12Pages:6076-6085
AbstractExperiments to determine silicate structural species in silicate-saturated aqueous fluids in equilibrium with silica polymorphs (quartz and coesite), enstatite, and enstatite+forsterite in the SiO2-H2O and MgO-SiO2-H2O systems have been carried out in situ in the 0.4-5.4GPa and 700-900 degrees C pressure and temperature ranges, respectively. MicroRaman spectroscopy was the structural probe. In the SiO2-H2O system (1.6-5.4GPa/700-900 degrees C), the detected silicate species are Q(0) (SiO44-), Q(1) (0.5 Si2O76-), and Q(2) (SiO32-). The expression 2Q(1)Q(0)+Q(2) describes the equilibrium among these species with H and V values from the isochoric temperature and isothermal pressure dependence of its equilibrium constant, K=XQ0XQ2/(X-Q1)(2), range from -23 to -69kJ/mol and -1 to -2cm(3)/mol, respectively. In the system MgO-SiO2-H2O the calculated silica solubility, using literature algorithms, is approximately 50% of that in the SiO2-H2O system at similar temperature and pressure. Only Q(1) and Q(0) species were detected in the MgO-SiO2-H2O fluids, whether in equilibrium with enstatite+forsterite (P<3GPa) or enstatite only (P>3GPa). The temperature and pressure dependence of the equilibrium constant, K=X-Q1/X-Q0, for this system yields average values of H=405kJ/mol and V=-2.30.4cm(3)/mol. The speciation of silicate in aqueous fluids resembles that in hydrous melts as a function of temperature and pressure at deep crustal and upper mantle temperature and pressure conditions, and they become increasingly similar with depth. As the silicate speciation and solubility in the aqueous fluid depend on silicate composition, the pressure and temperature at which complete miscibility occurs will also vary with silicate composition. The structural similarity between fluids and melts will also lead to fluid/melt element partition coefficients trending toward 1 and mineral/fluid partition coefficients trending toward mineral/melt values in the upper mantle as the silicate-H2O systems approach complete miscibility with increasing temperature and pressure.
SubtypeArticle
KeywordAqueous Fluid Pressure Temperature Spectroscopy Solubility
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/2013JB010537
Indexed BySCI
Language英语
WOS KeywordDIAMOND-ANVIL CELL ; SI-29 MAS-NMR ; HIGH-PRESSURE ; RAMAN-SPECTROSCOPY ; SOLUBILITY MEASUREMENTS ; ELEVATED-TEMPERATURES ; SOLUTION MECHANISMS ; DEGREES-C ; GLASSES ; MELTS
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000329851800003
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/736
Collection深海科学研究部_深海极端环境模拟研究实验室
Affiliation1.Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
2.Univ Tokyo, Earthquake Res Inst, Tokyo 113, Japan
3.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Lab Expt Study Deep Sea Extreme Condit, Sanya, Peoples R China
4.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY USA
Recommended Citation
GB/T 7714
Mysen, B. O.,Mibe, K.,Chou, I. -M.,et al. Structure and equilibria among silicate species in aqueous fluids in the upper mantle: Experimental SiO2-H2O and MgO-SiO2-H2O data recorded in situ to 900 degrees C and 5.4GPa[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2013,118(12):6076-6085.
APA Mysen, B. O.,Mibe, K.,Chou, I. -M.,&Bassett, W. A..(2013).Structure and equilibria among silicate species in aqueous fluids in the upper mantle: Experimental SiO2-H2O and MgO-SiO2-H2O data recorded in situ to 900 degrees C and 5.4GPa.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,118(12),6076-6085.
MLA Mysen, B. O.,et al."Structure and equilibria among silicate species in aqueous fluids in the upper mantle: Experimental SiO2-H2O and MgO-SiO2-H2O data recorded in situ to 900 degrees C and 5.4GPa".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 118.12(2013):6076-6085.
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