Thermoelastic and thermodynamic properties of plagioclase feldspars from thermal expansion measurements

Tribaudino, Mario; Bruno, Marco; Nestola, Fabrizio; Pasqual, Daria; Angel, R. J.

doi:10.2138/am.2011.3722

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…Using the isothermal bulk modulus and expansivity data (Hovis et al 2010;Tribaudino et al 2011) and considering the experimental values of the diffusion coefficients of hydrogen in plagioclase feldspar reported by Johnson and Rossman (2013), a linear variation of log D versus B k B T is depicted in Fig. 1, clearly indicating the validity of the cBΩ model.…”

Section: Rtmentioning

confidence: 71%

“…In the case of plagioclase feldspar (Ab 66 An 31 Or 3 ), B 0 = 67.8 GPa (Tribaudino et al 2011), Ω 0 = 668 Å 3 and β 0 = 2.26 × 10 −5 /K (Hovis et al 2010), (∂B/∂T) P = −0.016 GPa/K (Ahrens 1995).…”

Section: Calculation Of Point Defect Parameters Based On the Cbω Modelmentioning

confidence: 99%

“…Recently, its validity has been extended to self-or heterodiffusion in Earth materials (Alexopoulos and Varotsos 1981;Dologlou 2011;Zhang et al 2010Zhang et al , 2011Zhang and Wu 2013;Zhang 2012Zhang , 2014Vallianatos and Saltas 2014;Zhang and Shan 2015a, b;Chroneos and Vovk 2015;Ganniari-Papageorgiou et al 2015;Saltas and Vallianatos 2015). In the present work, our goal is to examine whether the diffusion behaviors of hydrogen and alkali ions in plagioclase feldspars can be reproduced in terms of the bulk and expansivity data based on the recent PVT equation of state of plagioclase feldspars investigated by in situ X-ray diffraction (Angel 2004;Benusa et al 2005;Hovis et al 2010;Tribaudino et al 2010Tribaudino et al , 2011. Such a thermodynamic method may potentially provide useful constraints on future experiments and further practical applications where experimental data are inconsistent or no experimental data exist.…”

Section: Introductionmentioning

confidence: 97%

“…Therefore, hydrogen diffusivity in adularia is probably enhanced by the presence of H 2 O during diffusion experiments, just like the effect of water on the electrical conductivity of mantle minerals(Yoshino et al 2006;Yang et al 2012). Meanwhile, the PVT equation of state of plagioclase feldspar has been widely investigated by in situ X-ray diffraction(Stewart and Von Limbach 1967;Angel 2004;Benusa et al 2005;Hovis et al 2010;Tribaudino et al 2010Tribaudino et al , 2011, whereas no systematically elastic and expansivity properties for adularia have been studied so far. In the present study, we therefore choose the diffusion data ofJohnson and Ross- man (2013) as an ideal case to test the validity of the cBΩ model for hydrogen diffusion in plagioclase feldspar.Despite the anisotropic structures of the feldspar group of minerals, previous studies(Kronenberg et al 1996;Johnson and Rossman 2013) have shown that hydrogen diffusion in feldspar is isotropic within measurement error under all experimental conditions.…”

mentioning

confidence: 99%

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Modeling H, Na, and K diffusion in plagioclase feldspar by relating point defect parameters to bulk properties

Zhang

Shan

2015

Phys Chem Minerals

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Section: Rtmentioning

confidence: 71%

Section: Calculation Of Point Defect Parameters Based On the Cbω Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

mentioning

confidence: 99%

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Modeling H, Na, and K diffusion in plagioclase feldspar by relating point defect parameters to bulk properties

Zhang

Shan

2015

Phys Chem Minerals

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“…In cycles 2, 3, and 4, kinks of K S and G are observed at ~500-750 K. Adiabatic bulk modulus (= K S0 ) and shear modulus (= G 0 ) at room temperature and room pressure were estimated by polynomial fitting using data at 300 K. We obtained K S0 = 83 GPa and G 0 = 38.6 GPa. Based on data of Angel (2004) on plagioclase feldspars, isothermal bulk modulus (K T0 ) at ambient condition was estimated by Tribaudino et al (2011) to be K T0 = 82.5 GPa. K S0 is calculated as 82.7 GPa from the formula K S0 = K T0 (1 + αγT) where α and γ are thermal expansion coefficient and Grüneisen parameter, and are 1.379 × 10 -5 K -1 and 0.46 (Tribaudino et al 2011), respectively.…”

Section: Resultsmentioning

confidence: 99%

Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments

Matsukage

Nishihara

Noritake

et al. 2015

American Mineralogist

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To understand the origin of observed low velocities in the crustal portion of subducting plates, we performed in situ measurements of elastic wave velocities of anorthite at temperatures up to 1373 K at pressure of ~1 GPa and up to 773 K at 2.0-7.0 GPa. A fine-grained polycrystalline anorthite, which was synthesized using a gas pressure apparatus, was used for the measurements. The high-pressure experiments were performed using the multi-anvil apparatus installed on beamline BL04B1 at SPring-8. The elastic wave velocity was measured by the ultrasonic pulse method with synchrotron X-ray radiographic imaging and X-ray diffraction techniques. At ~1.0 GPa, elastic wave velocities exhibited a sharp temperature-induced kink at ~500 K. Below 500 K, the elastic wave velocities decrease with increasing temperature. In contrast, above 500 K, the elastic wave velocities show an increasing trend in the range of 500-900 K, and then revert back to a decreasing trend at above 900 K. We also found a pressure-induced velocity anomaly of anorthite. At 300-373 K, v P is constant up to 4 GPa, but decrease above 4 GPa with increasing pressure, while v S decreases monotonously with increasing pressure. These elastic anomalies are considered to be attributable to the tilting behavior of the corner-sharing TO 4 (T = Al, Si) tetrahedra in three-dimensional frameworks of anorthite. Our results suggest the presence of plagioclase feldspar has the potential to causes low-velocity anomaly in the subducting oceanic crust when it survives as a metastable phase in the slab at higher pressure and lower temperature conditions.

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Elasticity of plagioclase feldspars

2016

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Elastic properties are reported for eight plagioclase feldspars that span compositions from albite (NaSi3AlO8) to anorthite (CaSi2Al2O8). Surface acoustic wave velocities measured using Impulsive Stimulated Light Scattering and compliance sums from high‐pressure X‐ray compression studies accurately determine all 21 components of the elasticity tensor for these triclinic minerals. The overall pattern of elasticity and the changes in individual elastic components with composition can be rationalized on the basis of the evolution of crystal structures and chemistry across this solid‐solution join. All plagioclase feldspars have high elastic anisotropy; a* (the direction perpendicular to the b and c axes) is the softest direction by a factor of 3 in albite. From albite to anorthite the stiffness of this direction undergoes the greatest change, increasing twofold. Small discontinuities in the elastic components, inferred to occur between the three plagioclase phases with distinct symmetry ( Ctrue1¯, Itrue1¯, and Ptrue1¯), appear consistent with the nature of the underlying conformation of the framework‐linked tetrahedra and the associated structural changes. Measured body wave velocities of plagioclase‐rich rocks, reported over the last five decades, are consistent with calculated Hill‐averaged velocities using the current moduli. This confirms long‐standing speculation that previously reported elastic moduli for plagioclase feldspars are systematically in error. The current results provide greater assurance that the seismic structure of the middle and lower crusts can be accurately estimated on the basis of specified mineral modes, chemistry, and fabric.

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Thermoelastic and thermodynamic properties of plagioclase feldspars from thermal expansion measurements

Cited by 28 publications

References 32 publications

Modeling H, Na, and K diffusion in plagioclase feldspar by relating point defect parameters to bulk properties

Modeling H, Na, and K diffusion in plagioclase feldspar by relating point defect parameters to bulk properties

Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments

Elasticity of plagioclase feldspars

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