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Temperature dependence of elastic moduli of β‐(Mg, Fe) 2 SiO 4
Author(s) -
Mayama Norihito,
Suzuki Isao,
Saito Toshiaki,
Ohno Ichiro,
Katsura Tomoo,
Yoneda Akira
Publication year - 2004
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 - 10.1029/2003gl019247
Subject(s) - olivine , moduli , crystallite , materials science , adiabatic process , mineralogy , bulk modulus , atmospheric temperature range , elastic modulus , shear (geology) , analytical chemistry (journal) , phase (matter) , thermodynamics , chemistry , composite material , physics , metallurgy , chromatography , quantum mechanics , organic chemistry
The elastic moduli of polycrystalline wadsleyite, β‐(Mg 0.91 Fe 0.09 ) 2 SiO 4 , were measured up to 470 K by means of the resonant sphere technique. The adiabatic bulk ( K S ) and shear (μ) moduli were found to be 165.72(6) and 105.43(2) GPa at room temperature. The average slopes ( dK S / dT and d μ/ dT ) in the range were determined to be −0.0175(3) and −0.0159(1) GPa/K. We estimated that the P ‐, S ‐wave velocity and density jumps for the α‐ to β‐phase transformation at the 410‐km depth condition were 9.5, 11.2 and 5.4%, respectively. These results suggest that the olivine component at the depth should be 52 and 42 volume % for P ‐ and S ‐waves.