Nonlinear effects of hydration on high-pressure sound velocities of rhyolitic glasses

Gu, Jesse T.; Fu, Suyu; Gardner, James E.; Yamashita, Shigeru; Okuchi, Takuo; Lin, Jung Fu

doi:10.2138/am-2021-7597

Cited by 6 publications

(1 citation statement)

References 75 publications

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“…In addition, embayment melt is in chemical and physical communication with free melt in the conduit via the embayment channel. Because pressure is conveyed at the speed of sound in a fluid, the channel provides a fluid dynamic pathway to maintain near-instantaneous barometric equilibrium between melt in the embayment and the conduit (Gu et al, 2021). Unlike in a melt inclusion, overpressure cannot be sustained in the embayment interior.…”

Section: Discussionmentioning

confidence: 99%

Implications of Multiple Disequilibrium Textures in Quartz-Hosted Embayments

et al. 2021

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The faces of volcanic phenocrysts may be marked by imperfections occurring as holes that penetrate the crystal interior. When filled with glass these features, called embayments or reentrants, have been used to petrologically constrain magmatic ascent rate. Embayment ascent speedometry relies on the record of disequilibrium preserved as diffusion-limited volatile concentration gradients in the embayment glass. Clear, glassy embayments are carefully selected for speedometry studies. The use and subsequent descriptions of pristine embayments overrepresent their actual abundance. Here, we provide a textural analysis of the number, morphology, and filling characteristics of quartz-hosted embayments. We target a collection of large (i.e., >20 km3 erupted volume) silicic eruptions, including the Bishop Tuff, Tuff of Bluff Point, Bandelier Tuff, Mesa Falls Tuff, and Huckleberry Ridge Tuff in the United States, Oruanui Tuff in New Zealand, Younger Toba Tuff in Indonesia, the Kos Plateau Tuff in Greece, and the Giant Pumice from La Primavera caldera in Mexico. For each unit, hundreds of quartz crystals were picked and the total number of embayment-hosting crystals were counted and categorized into classifications based on the vesicularity and morphology. We observed significant variability in embayment abundance, form, and vesicularity across different eruptions. Simple, cylindrical forms are the most common, as are dense glassy embayments. Increasingly complex shapes and a range of bubble textures are also common. Embayments may crosscut or deflect prominent internal cathodoluminescence banding in the host quartz, indicating that embayments form by both dissolution and growth. We propose potential additional timescales recorded by embayment disequilibrium textures, namely, faceting, bubbles, and the lack thereof. Embayment formation likely occurs tens to hundreds of years before eruption because embayment surfaces are rounded instead of faceted. Bubble textures in embayments are far from those predicted by equilibrium solubility. Homogenous nucleation conditions likely allow preservation of pressures much greater than magmastatic inside embayments. Our textural observations lend insight into embayment occurrence and formation and guide further embayment studies.

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Section: Discussionmentioning

confidence: 99%

Implications of Multiple Disequilibrium Textures in Quartz-Hosted Embayments

et al. 2021

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Lattice dynamics, sound velocities, and atomic environments of szomolnokite at high pressure

Pardo,

Dobrosavljevic,

Sturhahn

et al. 2023

Phys Chem Minerals

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Complex mixtures of sulfates, silicates, and ice have been observed in a variety of planetary environments on Earth, Mars and the icy satellites of the solar system. Characterizing the properties of the corresponding compositional endmembers is important for understanding the interiors of a range of planetary bodies in which these phases are observed. To measure the electronic and vibrational properties of the iron endmember, szomolnokite, (FeSO 4 ⋅H 2 O), we have performed synchrotron 57 Fe nuclear resonant inelastic and forward scattering experiments in the diamond anvil cell up to 14.5 GPa. This pressure range covers depths within Earth's interior relevant to sulfur cycling in subduction zones and the range of pressures expected within icy satellites interiors. We nd evidence of crystal lattice softening, changes in elastic properties, and changes in the electric eld gradients of iron atoms associated with two structural transitions occurring within the experimental pressure range. We apply these ndings to icy satellite interiors, including discussion of elastic properties and implications for tidal observations.

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Fingerprinting crustal anatexis with apatite trace element, halogen, and Sr isotope data

Liu

Zhang

2023

Geochimica et Cosmochimica Acta

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Nonlinear effects of hydration on high-pressure sound velocities of rhyolitic glasses

Cited by 6 publications

References 75 publications

Implications of Multiple Disequilibrium Textures in Quartz-Hosted Embayments

Implications of Multiple Disequilibrium Textures in Quartz-Hosted Embayments

Lattice dynamics, sound velocities, and atomic environments of szomolnokite at high pressure

Fingerprinting crustal anatexis with apatite trace element, halogen, and Sr isotope data

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