Water solubility in orthopyroxene

Rauch, Marcus; Keppler, Hans

doi:10.1007/s00410-002-0365-6

Cited by 181 publications

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“…actually decrease slightly between 6 and 13 GPa, which could in theory lead to an increase in the percentage of melting for a fixed H 2 O content. However, the decrease in melt H 2 O content is small and this effect would be counteracted by an increase in the enstatite-melt partitioning coefficient with pressure, calculated from the literature (Rauch and Keppler, 2002;Yamada et al, 2004;Withers and Hirschmann, 2007;Withers et al, 2011) and melt H 2 O content from this study. Peridotite melts are also predicted to require more H 2 O to be stable at higher pressures, although the H 2 O concentrations tend to vary very little towards the base of the upper mantle similar in fact to MgSiO 3 .…”

Section: Hydrous Melts Along Adiabatic Temperature Gradientmentioning

confidence: 64%

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Novella

Dolejš

Myhill

et al. 2017

Geochimica et Cosmochimica Acta

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms A temperature dependent equilibrium constant is necessary to reproduce the data, however, implying that molecular H 2 O becomes more important in the melt with decreasing temperature. The data for hydrous forsterite melting at 13 GPa are inconclusive due to uncertainties in the anhydrous melting temperature at these conditions. When applied to results on natural peridotite melt systems at similar conditions, the same model infers the presence mainly of molecular H 2 O, implying a significant difference in physiochemical behavior between simple and complex hydrous

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Section: Hydrous Melts Along Adiabatic Temperature Gradientmentioning

confidence: 64%

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Novella

Dolejš

Myhill

et al. 2017

Geochimica et Cosmochimica Acta

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“…In fact, if the hydrogarnet model for hydrogen dissolution in garnet were valid, then the dependence of hydrogen partitioning between olivine and garnet on water fugacity would be opposite to what we observed. A possible mechanism to explain this observation is the coupled substitution of silicon (Si 4+ ) by a proton (H + ) and aluminium (Al 3+ ) [Hauri et al, 2006;Rauch and Keppler, 2002]. The chemical reaction .…”

Section: Discussionmentioning

confidence: 99%

Solubility of water in pyrope‐rich garnet at high pressures and temperature

Mookherjee

Karato

2010

Geophysical Research Letters

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[1] The water solubility in pyrope-rich garnet was determined between pressures of 5-9 GPa and temperatures of 1373 -1473 K under silica activity and oxygen fugacity similar to those expected in the Earth's upper mantle. We found that pyrope-rich garnet has substantial water solubility up to $0.1 wt% under these conditions. In addition, the water content in garnet varied as a function of chemical conditions. In particular, the variation in water fugacity (and Mg#) caused a variation in water partitioning with olivine (D H 2 O ol/py ). The substantial water solubility in pyrope-rich garnet under deep upper mantle conditions might have significant influence on physical and transport properties.Citation: Mookherjee, M., and S. Karato (2010), Solubility of water in pyrope-rich garnet at high pressures and temperature, Geophys. Res. Lett., 37, L03310,

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“…Previous studies indicate that the water solubility in pure MgSiO 3 enstatite increases with increasing pressure and temperature [21,22], while behavior of water solubility in Al-free ensta-3896 Zhang B H, et al Chin Sci Bull November (2013) Vol.58 No.32 tite is comparable to that in olivine [11,23]. In contrast, the incorporation of aluminum in orthopyroxene greatly increases the water solubility relative to that in the pure Al-free system [13,21,[24][25][26]. As a result, the partition coefficient of water between aluminous enstatite and olivine is very high: = 11.7−25 [13,27-30].…”

Section: Citationmentioning

confidence: 99%

“…Therefore, aluminous enstatite could be a more important host than olivine for water in the Earth's upper mantle, and it may be related to abnormal geophysical observations at the top of the asthenosphere [1,3,7,13,16]. The solubility of water as a function of temperature and pressure has been investigated to determine the mechanism and thermodynamics of the incorporation of water in orthopyroxene [13,21,24,25,[27][28][29]. However, it is worth noting that most studies were conducted using a pure MgSiO 3 system [21,24,[27][28][29] and single crystals of orthopyroxene.…”

Section: Citationmentioning

confidence: 99%

“…The solubility of water as a function of temperature and pressure has been investigated to determine the mechanism and thermodynamics of the incorporation of water in orthopyroxene [13,21,24,25,[27][28][29]. However, it is worth noting that most studies were conducted using a pure MgSiO 3 system [21,24,[27][28][29] and single crystals of orthopyroxene. Except for two studies [13,25], few data on water solubility have been systematically reported for the (Mg, Fe)SiO 3 -H 2 O-Al 2 O 3 system (Al-Fe-Mg orthopyroxene) that simultaneously consider the influences of temperature and Al content.…”

Section: Citationmentioning

confidence: 99%

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Water solubility in orthopyroxene: Dependence on temperature and Al content

Zhang

Matsuzaki

2013

Chin. Sci. Bull.

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The water solubility in Al-Fe-Mg orthopyroxene [(Mg,Fe,Al)(Si,Al)O 3 : X Fe = 0.1] was investigated as a function of temperature and Al contents. Experiments were performed at 10 kbar with temperatures ranging from 800 to 1200°C under water-saturated conditions. Water contents in the (Mg,Fe)SiO 3 -H 2 O-Al 2 O 3 system were determined using unpolarized Fourier transform infrared spectroscopy. The present results show that water solubility in Al-bearing orthopyroxene decreases systematically with temperature from approximately 1 weight % at 800°C to 568 ± 58 ppm at 1200°C and increase significantly with increasing Al 2 O 3 contents under the same annealing temperature and pressure. Combined with published results on the dependence of hydroxyl solubility on water fugacity and pressure, the present results can be described by the relationwhere A = 0.0024 ± 0.0015 ppm/bar 0.5 , 1bar H = −103.348 ± 9.768 kJ/mol, and solid V = 9.2 ± 1.1 cm 3 /mol. This equation implies that the incorporation mechanism of water in aluminous orthopyroxene involves the isolated OH groups. Based on the experimentally established solubility model used in this study, it is suggested that water solubility decreases with increasing temperature under typical upper mantle pressure. The predicted temperature dependence of water solubility is in good agreement with the previous experimental observations in Al-bearing orthopyroxene, but the opposite dependence is observed in Al-free systems. Moreover, our estimation of the water solubility in upper-mantle minerals as a function of depth for a typical oceanic geotherm might be of potential importance in interpreting the geophysical observations. orthopyroxene, water solubility, infrared spectroscopy, asthenosphere Citation:Zhang B H, Matsuzaki T, Wu X P. Water solubility in orthopyroxene: Dependence on temperature and Al content. Chin Sci Bull, 2013Bull, , 58: 38953902, doi: 10.1007 The presence of water or hydroxyl defects in nominally anhydrous minerals (NAMs) has a dramatical influence on their geophysical properties such as solidus temperature [1], electrical conductivity [2-6] and viscosity [7][8][9], as well as on mantle dynamics such as melt generation [10] and mantle convection [7]. Critical to understanding the role of water in the Earth's mantle, a key step is to estimate the distribution of water inside the mantle and the incorporation mechanism of hydrogen in mantle minerals by combining experimentally determined mineral properties with geophysical observations. Two principal approaches can provide significant constraints on the water content in the Earth's interior. One approach is water solubility experiments in mantle minerals [11][12][13], and the other infers the water content based on the electrical conductivity of the NAMs [2-6,14-19].Orthopyroxene is considered to be one of the main constituent minerals in the Earth's upper mantle and is believed to constitute approximately 20-40 vol% [20]. Previous studies indicate that the water solubility in pure MgSiO 3 enstatite increa...

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Water solubility in orthopyroxene

Cited by 181 publications

References 0 publications

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Solubility of water in pyrope‐rich garnet at high pressures and temperature

Water solubility in orthopyroxene: Dependence on temperature and Al content

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