DOI: 10.1029/90jb02490. Elasticity of germanate and silicate spinels at high pressure

Elasticity of germanate and silicate spinels at high pressure

10.1029/90jb02490

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Solid Earth (13)

Abstract

Compressional and shear wave velocities have been measured as functions of pressure to 3 GPa for a suite of low‐porosity, isotropic, polycrystalline germanate and silicate spinels using the phase‐comparison variant of ultrasonic pulse interferometry. Curvature in velocity‐pressure trends below a threshold pressure of order 1.5 GPa is caused by closure of microcracks and imperfect acoustic coupling between the specimen and the acoustic buffer rod. Pressure derivatives of wave velocity are determined from linear velocity‐pressure trends above this threshold pressure. Previous work on sintered polycrystals of comparable acoustic quality has demonstrated that pressure derivatives determined in this way match those of the ideal zero‐porosity aggregate within 10%. The measured derivatives are used to calculate the pressure derivatives dK/dP and dG/dP of the bulk and shear moduli. Although systematic variation of dK/dP with composition is not evident, variation of dG/dP with K/G within the silicate and germanate series suggests a likely value of dG/dP ∼ 1.9 for γ‐Mg2SiO4.

Bibliography

Rigden, S. M., & Jackson, I. (1991). Elasticity of germanate and silicate spinels at high pressure. Journal of Geophysical Research: Solid Earth, 96(B6), 9999â10006. Portico.

Authors 2

Sally M. Rigden (first)
Ian Jackson (additional)

References 28 Referenced 33

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Dates

Type	When
Created	17 years, 6 months ago (Feb. 6, 2008, 10:46 a.m.)
Deposited	1 year, 11 months ago (Sept. 23, 2023, 4:39 a.m.)
Indexed	1 year ago (Aug. 5, 2024, 3:57 a.m.)
Issued	34 years, 2 months ago (June 10, 1991)
Published	34 years, 2 months ago (June 10, 1991)
Published Online	12 years, 11 months ago (Sept. 20, 2012)
Published Print	34 years, 2 months ago (June 10, 1991)

Funders 0

None

BibTeX

@article{Rigden_1991, title={Elasticity of germanate and silicate spinels at high pressure}, volume={96}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/90jb02490}, DOI={10.1029/90jb02490}, number={B6}, journal={Journal of Geophysical Research: Solid Earth}, publisher={American Geophysical Union (AGU)}, author={Rigden, Sally M. and Jackson, Ian}, year={1991}, month=jun, pages={9999–10006} }

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