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Open AccessArticle

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

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Division of Physics, Engineering, Mathematics & Computer Science, Delaware State University, Dover, DE 19901, USA
2
Mineral Physics Institute, Stony Brook University, Stony Brook, NY 11794, USA
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Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA
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Key Laboratory for High Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
5
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 209; https://doi.org/10.3390/min10030209 (registering DOI)
Received: 21 January 2020 / Revised: 16 February 2020 / Accepted: 21 February 2020 / Published: 26 February 2020
(This article belongs to the Special Issue Mineral Physics—In Memory of Orson Anderson)
We measured the elastic velocities of a synthetic polycrystalline β-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 Kso = 161.5(2) GPa, Go = 101.6(1) GPa, and (∂Ks/∂P)T = 4.84(4), (∂G/∂P)T = 1.68(2) indistinguishable from Kso = 161.1(3) GPa, Go = 101.4(1) GPa, and (∂Ks/∂P)T = 4.93(4), (∂G/∂P)T = 1.73(2) from the linear fit. The hydration of the wadsleyite by 0.73 wt.% decreases Ks and G moduli by 5.3% and 8.6%, respectively, but no measurable effect was noted for (∂Ks/∂P)T and (∂G/∂P)T. The temperature derivatives of the Ks and G moduli from the finite strain analysis (∂KS/∂T)P = −0.013(2) GPaK−1, (∂G/∂T)P = −0.015(0.4) GPaK−1, and the linear fit (∂KS/∂T)P = −0.015(1) GPaK−1, (∂G/∂T)P = −0.016(1) GPaK−1 are in agreement, and both data sets indicating the |(∂G/∂T)P| to be greater than |(∂KS/∂T)P|. Calculations yield ∆Vp(α-β) = 9.88% and ∆VS(α-β) = 8.70% for the hydrous β-Mg2SiO4 and hydrous α-Mg2SiO4, implying 46–52% olivine volume content in the Earth’s mantle to satisfy the seismic velocity contrast ∆Vs = ∆VP = 4.6% at the 410 km depth. View Full-Text
Keywords: elasticity; hydrous wadsleyite; equation of state; ultrasonic interferometry; synchrotron X-radiation; high temperature; high pressure; mantle composition elasticity; hydrous wadsleyite; equation of state; ultrasonic interferometry; synchrotron X-radiation; high temperature; high pressure; mantle composition
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Gwanmesia, G.D.; Whitaker, M.L.; Dai, L.; James, A.; Chen, H.; Triplett, R.S.; Cai, N. 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. Minerals 2020, 10, 209.

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