A thermodynamic model for the system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si32.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SiO</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:ms>–</mml:ms><mml:msub><mml:mrow><mml:mtext>H</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mtext>O</mml:mtext></mml:mrow></mml:math>near the upper critical end point based on quartz solubility experiments at 500–1100 °C and 5–20

Hunt, J. D.; Manning, Craig E.

doi:10.1016/j.gca.2012.03.006

Cited by 55 publications

(2 citation statements)

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“…As mentioned above, the contribution of grain growth to deformation can be important through a change in grain size, which leads to a change in deformation mechanism (grain-size-insensitive creep and/or grain-size-sensitive creep). There have been many deformation experiments, as well as a theoretical approach (Fukuda and Shimizu, 2017), on quartz to derive flow laws for grain-size-insensitive creep (e.g., Jaoul et al, 1984;Luan and Paterson, 1992;Gleason and Tullis, 1995;Rutter and Brodie, 2004a;Holyoke and Kronenberg, 2013, and references therein), grain-size-sensitive creep (Rutter and Brodie, 2004b), and mixtures of these two creep types (Fukuda et al, 2018;Richter et al, 2018). When grain-sizeinsensitive creep operates, a reduction in grain size due to dynamic recrystallization has commonly been observed.…”

Section: Introductionmentioning

confidence: 99%

Experimental grain growth of quartz aggregates under wet conditions and its application to deformation in nature

et al. 2019

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Abstract. Grain growth of quartz was investigated using two quartz samples (powder and novaculite) with water under pressure and temperature conditions of 1.0–2.5 GPa and 800–1100 ∘C. The compacted powder preserved a substantial porosity, which caused a slower grain growth than in the novaculite. We assumed a grain growth law of dn-d0n=k0fH2Orexp⁡(-Q/RT)t with grain size d (µm) at time t (seconds), initial grain size d0 (µm), growth exponent n, a constant k0 (µmn MPa−r s−1), water fugacity fH2O (MPa) with the exponent r, activation energy Q (kJ mol−1), gas constant R, and temperature T in Kelvin. The parameters we obtained were n=2.5±0.4, k0=10-8.8±1.4, r=2.3±0.3, and Q=48±34 for the powder and n=2.9±0.4, k0=10-5.8±2.0, r=1.9±0.3, and Q=60±49 for the novaculite. The grain growth parameters obtained for the powder may be of limited use because of the high porosity of the powder with respect to crystalline rocks (novaculite), even if the differences between powder and novaculite vanish when grain sizes reach ∼70 µm. Extrapolation of the grain growth laws to natural conditions indicates that the contribution of grain growth to plastic deformation in the middle crust may be small. However, grain growth might become important for deformation in the lower crust when the strain rate is < 10−12 s−1.

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Section: Introductionmentioning

confidence: 99%

Experimental grain growth of quartz aggregates under wet conditions and its application to deformation in nature

et al. 2019

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“…A series of related experiments showed that increases in temperature and pressure can significantly improve the solubility of silicate minerals in water ( 34 – 36 ). Under the pressure and temperature conditions of island arc (2.5 to 6.0 GPa, 700 to 900 °C), the fluid released by subducted slab can dissolve more than 20 to 30 wt.% of silicates ( 37 ), thus forming solute-rich aqueous fluid or supercritical fluid. The SiO 2 content of the captured fluid in the MFIs clearly conforms to this range.…”

Section: Resultsmentioning

confidence: 99%

Supercritical fluid in deep subduction zones as revealed by multiphase fluid inclusions in an ultrahigh-pressure metamorphic vein

Jin

Xiao

Tan

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Due to their low viscosity, high mobility, and high element contents, supercritical fluids are important agents in the cycling of elements. However, the chemical composition of supercritical fluids in natural rocks is poorly understood. Here, we investigate well-preserved primary multiphase fluid inclusions (MFIs) from an ultrahigh-pressure (UHP) metamorphic vein of the Bixiling eclogite in Dabieshan, China, thus providing direct evidence for the components of supercritical fluid occurring in a natural system. Via the 3D modeling of MFIs by Raman scanning, we quantitatively determined the major composition of the fluid trapped in the MFIs. Combined with the peak-metamorphic pressure–temperature conditions and the cooccurrence of coesite, rutile, and garnet, we suggest that the trapped fluids in the MFIs represent supercritical fluids in a deep subduction zone. The strong mobility of the supercritical fluids with respect to carbon and sulfur suggests that such fluids have profound effects on global carbon and sulfur cycling.

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Experimental determination of quartz solubility and melting in the system SiO2–H2O–NaCl at 15–20 kbar and 900–1100 °C: implications for silica polymerization and the formation of supercritical fluids

Cruz

Manning

2015

Contrib Mineral Petrol

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A thermodynamic model for the systemSiO2–H2Onear the upper critical end point based on quartz solubility experiments at 500–1100 °C and 5–20

Cited by 55 publications

References 54 publications

Experimental grain growth of quartz aggregates under wet conditions and its application to deformation in nature

Experimental grain growth of quartz aggregates under wet conditions and its application to deformation in nature

Supercritical fluid in deep subduction zones as revealed by multiphase fluid inclusions in an ultrahigh-pressure metamorphic vein

Experimental determination of quartz solubility and melting in the system SiO2–H2O–NaCl at 15–20 kbar and 900–1100 °C: implications for silica polymerization and the formation of supercritical fluids

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