The Elastic Properties of β-Mg2SiO4 Containing 0.73 wt.% of H2O to 10 GPa and 600 K by Ultrasonic Interferometry with Synchrotron X-Radiation

被引:5
作者
Gwanmesia, Gabriel D. [1 ,2 ]
Whitaker, Matthew L. [2 ,3 ]
Dai, Lidong [4 ]
James, Alwin [5 ]
Chen, Haiyan [2 ,3 ]
Triplett, Richard S. [2 ,3 ]
Cai, Nao [2 ]
机构
[1] Delaware State Univ, Div Phys Math & Comp Sci, Dover, DE 19901 USA
[2] SUNY Stony Brook, Mineral Phys Inst, Stony Brook, NY 11794 USA
[3] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
[4] Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550002, Peoples R China
[5] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
基金
美国国家科学基金会;
关键词
elasticity; hydrous wadsleyite; equation of state; ultrasonic interferometry; synchrotron X-radiation; high temperature; high pressure; mantle composition; SINGLE-CRYSTAL ELASTICITY; HIGH-PRESSURE; HYDROUS WADSLEYITE; BETA-PHASE; ELECTRICAL-CONDUCTIVITY; TEMPERATURE-DEPENDENCE; SOUND VELOCITIES; MANTLE MINERALS; MODIFIED SPINEL; WATER;
D O I
10.3390/min10030209
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We measured the elastic velocities of a synthetic polycrystalline beta -Mg2SiO4 containing 0.73 wt.% H2O to 10 GPa and 600 K using ultrasonic interferometry combined with synchrotron X-radiation. Third-order Eulerian finite strain analysis of the high P and T data set yielded K-so = 161.5(2) GPa, G(o) = 101.6(1) GPa, and (partial derivative K-s/partial derivative P)(T) = 4.84(4), (partial derivative G/partial derivative P)(T) = 1.68(2) indistinguishable from K-so = 161.1(3) GPa, G(o) = 101.4(1) GPa, and (partial derivative K-s/partial derivative P)(T) = 4.93(4), (partial derivative G/partial derivative P)(T) = 1.73(2) from the linear fit. The hydration of the wadsleyite by 0.73 wt.% decreases K-s and G moduli by 5.3% and 8.6%, respectively, but no measurable effect was noted for (partial derivative K-s/partial derivative P)(T) and (partial derivative G/partial derivative P)(T). The temperature derivatives of the K-s and G moduli from the finite strain analysis (partial derivative K-S/partial derivative T)(P) = -0.013(2) GPaK(-1), (partial derivative G/partial derivative T)(P) = -0.015(0.4) GPaK(-1), and the linear fit (partial derivative K-S/partial derivative T)(P) = -0.015(1) GPaK(-1), (partial derivative G/partial derivative T)(P) = -0.016(1) GPaK(-1) are in agreement, and both data sets indicating the |(partial derivative G/partial derivative T)(P)| to be greater than |(partial derivative K-S/partial derivative T)(P)|. Calculations yield Vp(alpha-beta) = 9.88% and VS(alpha-beta) = 8.70% for the hydrous beta -Mg2SiO4 and hydrous alpha -Mg2SiO4, implying 46-52% olivine volume content in the Earth's mantle to satisfy the seismic velocity contrast V-s = V-P = 4.6% at the 410 km depth.
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页数:21
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