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Pressure induced elastic softening in framework aluminosilicate- albite (NaAlSi3O8)

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep34815· OSTI ID:1344523
 [1];  [2];  [3];  [4];  [1];  [5]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Univ. Montpellier, Montpellier (France)
  3. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Cornell Univ., Ithaca, NY (United States)

Albite (NaAlSi3O8) is an aluminosilicate mineral. Its crystal structure consists of 3-D framework of Al and Si tetrahedral units. We have used Density Functional Theory to investigate the high-pressure behavior of the crystal structure and how it affects the elasticity of albite. Our results indicate elastic softening between 6–8 GPa. This is observed in all the individual elastic stiffness components. Our analysis indicates that the softening is due to the response of the three-dimensional tetrahedral framework, in particular by the pressure dependent changes in the tetrahedral tilts. At pressure <6 GPa, the PAW-GGA can be described by a Birch-Murnaghan equation of state with VGGA0 = 687.4Å3, KGGA0 = 51.7 GPa, and GGGA0 = 4.7. The shear modulus and its pressure derivative are K⊕GGA0 = 33.7 GPa, and G⊕GGA0 = 2.9. At 1 bar, the azimuthal compressional and shear wave anisotropy AVGGAP = 42.8%, and AVGGAS = 50.1%. We also investigate the densification of albite to a mixture of jadeite and quartz. The transformation is likely to cause a discontinuity in density, compressional, and shear wave velocity across the crust and mantle. Furthermore, this could partially account for the Mohorovicic discontinuity in thickened continental crustal regions.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1344523
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Seismic properties and anisotropy of the continental crust: Predictions based on mineral texture and rock microstructure: SEISMIC PROPERTIES OF THE CRUST journal May 2017
Unconventional high-pressure Raman spectroscopy study of kinetic and peak pressure effects in plagioclase feldspars journal January 2020
Polymorphism of feldspars above 10 GPa journal June 2020
High pressure phase transitions of paracelsian BaAl2Si2O8 journal September 2019
High pressure phase transitions of paracelsian $BaAl_{2}Si_{2}O_{8}$ text January 2019
Polymorphism of feldspars above 10 GPa text January 2020

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