Elastic parameters of feldspars and quartz at high pressures

Galdin, N. Ye.

doi:10.1080/00206817709471053

Cited by 2 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recent experimental results 20 are represented by filled grey symbol. The experimentally measured velocities 38 39 are softer compared to the recent experiments 20 for ⊥ (010) and ⊥ (001). ( d ) Bulk compressional wave V P and shear V S velocity as a function of pressure.…”

Section: Figurementioning

confidence: 59%

“…Although, the earlier work on feldspar megacrysts 37 38 are “softer” relative to recent work 19 in directions perpendicular to cleavage, i.e., b * and c * directions, the comparison is in better accord with the “true” single crystal behavior in the non-cleavage direction (100). It is likely that in the earlier experiments to determine the elastic constants 38 39 , the closing of the cracks at low-pressure lead to significantly greater pressure derivatives ( Fig. 5 ).…”

Section: Discussionmentioning

confidence: 96%

“…LDA and GGA results are represented by filled red and blue symbols. Experimentally measured V P as a function of pressure for albite (An5–8) 38 (open white symbols) and oligoclase (An 10–30) 39 (filled black symbols) to 1 and 2 GPa respectively. The recent experimental results 20 are represented by filled grey symbol.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

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

Mookherjee

Mainprice

Maheshwari

et al. 2016

Sci Rep

View full text Add to dashboard Cite

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 = 687.4 Å3, = 51.7 GPa, and = 4.7. The shear modulus and its pressure derivative are = 33.7 GPa, and = 2.9. At 1 bar, the azimuthal compressional and shear wave anisotropy = 42.8%, and = 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. This could partially account for the Mohorovicic discontinuity in thickened continental crustal regions.

show abstract