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Pressure dependence of the elastic wave velocities for Mg 2 GeO 4 spinel to 3 Gpa
Author(s) -
Rigden S. M.,
Jackson I.,
Niesler H.,
Ringwood A. E.,
Liebermann R. C.
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i006p00605
Subject(s) - germanate , spinel , mantle (geology) , mineralogy , silicate , crystallite , bulk modulus , shear (geology) , materials science , atmospheric pressure , elastic modulus , shear modulus , magnesium , geology , analytical chemistry (journal) , geophysics , chemistry , composite material , metallurgy , oceanography , optoelectronics , organic chemistry , doping , chromatography
New measurements of compressional and shear wave velocities on polycrystalline Mg 2 GeO 4 spinel (γ) to 3 GPa have yielded the first reported data on pressure derivatives of bulk and shear moduli for this material. The measured values (dK/dP = 4.1 and dG/dP = 1.2) are compared with pressure derivatives for MgAl 2 O 4 spinel. Although dK/dP is comparable for the two materials, dG/dP is much higher for the germanate. Pressure derivatives of elastic properties of mantle spinels cannot be simply predicted from the data on the two analogue materials presently available although single crystal measurements of elastic moduli of magnesium germanate and magnesium silicate spinels at atmospheric pressure by Weidner and co‐workers lend support to the use of magnesium germanate as an elastic analogue for silicate spinels of the Earth's mantle.