The dichotomous nature of Mg partitioning between plagioclase and melt: Implications for diffusion chronometry

Mutch, E. J. F.; Maclennan, John; Madden-Nadeau, Amber

doi:10.1016/j.gca.2022.10.035

Cited by 10 publications

(3 citation statements)

References 78 publications

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“…9) although there is a relatively abrupt step up to higher values between 1000-1100°C. We tentatively suggest this step up may result from the C1-I1 structural phase transition which occurs near this temperature, and has been shown to affect plagioclase Mg partitioning behaviour (Mutch et al, 2022). Using the criteria of Putirka (2008) would exclude a number of experiments close to the cut off (Supporting Fig.…”

Section: Plagioclase-liquid Thermometry and Hygrometrymentioning

confidence: 99%

Determining the Pressure – Temperature – Composition (P-T-X) conditions of magma storage

Wieser,

Gleeson,

Matthews

et al. 2024

Preprint

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Determining the pressures and temperatures at which melts are stored in the crust and upper mantle, and the major element composition, redox state and volatile contents of these melts, is vital to constrain the structure and dynamics of magmatic plumbing systems. In turn, constraining these parameters helps understand the geochemical and structural evolution of the Earth’s lithosphere, and periods of unrest at active volcanoes. We review common thermobarometers, hygrometers and chemometers based on mineral and/or liquid compositions, before discussing recent advances in melt and fluid inclusion barometry, Raman-based elastic thermobarometry, and thermodynamic modelling methods. Where possible, we investigate the accuracy and precision of each technique, and the implications for the application of each method to different research questions.

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Section: Plagioclase-liquid Thermometry and Hygrometrymentioning

confidence: 99%

Determining the Pressure – Temperature – Composition (P-T-X) conditions of magma storage

Wieser,

Gleeson,

Matthews

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The expectation, therefore, is that for temperatures corresponding to those at which plagioclase crystals coexist with a basaltic liquid there should be a maximum in K o half way across the solid solution. In the Blundy and Wood model, such a break in slope of bulk modulus with composition would contribute to the pattern of partition coefficients for Mg 2+ between plagioclase and melt reported by Mutch et al (2022), though the magnitude of the contribution remains undefined.…”

Section: Elastic Moduli For Trace Element Partitioning Between Plagio...mentioning

confidence: 95%

“…It depends on an effective Young's modulus for the site on which the substitution occurs and this, in turn, is related to the Young's modulus of the bulk crystal. Mutch et al (2022) recently reviewed treatments of the partitioning of Mg 2+ between plagioclase crystals and melt that had included a smooth variation of properties with composition across the plagioclase solid solution. They found that a better match with experimental data was obtained if an inflection point was included in the composition dependence of the partition coefficient at temperatures and compositions corresponding to the locus of the C1 ̅  I1 ̅ transition.…”

Section: Elastic Moduli For Trace Element Partitioning Between Plagio...mentioning

confidence: 99%

Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars

Atkinson,

Ballaran,

Carpenter

2024

American Mineralogist

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Hard Mode IR powder absorption spectroscopy has been used to characterise local strain relaxation associated with Al/Si ordering in a suite of synthetic anorthite samples with structural states that vary from a high degree of Al/Si order through a metastable incommensurate structure at intermediate states of order to long range order with I1 ̅ symmetry. The dominant feature accompanying the changing structural states is line broadening, which has been quantified by autocorrelation analysis and is attributed to local heterogeneous strain variations on a length scale of at least 1-5 unit cells. The autocorrelation results are consistent with contributions to the line broadening as being due to order parameters for both the C1 ̅  I1 ̅ and I1 ̅  P1 ̅ transitions which couple biquadratically, 𝜆𝑄 od 2 𝑄 displ 2 .Close correlation with enthalpy variations from previously published calorimetric data indicates that the driving force for ordering can be understood in terms of elimination of strain fields arising from accommodating more or less rigid AlO 4 and SiO 4 tetrahedra in the feldspar framework. The metastable This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Constraining magma storage conditions of the Toba magmatic system: a plagioclase and amphibole perspective

Lubbers,

Kent,

de Silva

2024

Contrib Mineral Petrol

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The dichotomous nature of Mg partitioning between plagioclase and melt: Implications for diffusion chronometry

Cited by 10 publications

References 78 publications

Determining the Pressure – Temperature – Composition (P-T-X) conditions of magma storage

Determining the Pressure – Temperature – Composition (P-T-X) conditions of magma storage

Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars

Constraining magma storage conditions of the Toba magmatic system: a plagioclase and amphibole perspective

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