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Elasticity of single-crystal low water content hydrous pyrope at high-pressure and high-temperature conditions
Dawei Fan;  Jingui Xu;  Chang Lu;  Sergey N. Tkachev;  Bo Li;  Zhiling Ye;  Shijie Huang;  Vitali B. Prakapenka;  Wenge Zhou
2019
Source PublicationAmerican Mineralogist
Volume104Issue:7Pages:1022–1031
Abstract

The elasticity of single-crystal hydrous pyrope with ~900 ppmw H2O has been derived from sound velocity and density measurements using in situ Brillouin light spectroscopy (BLS) and synchrotron X-ray diffraction (XRD) in the diamond-anvil cell (DAC) up to 18.6 GPa at room temperature and up to 700 K at ambient pressure. These experimental results are used to evaluate the effect of hydration on the single-crystal elasticity of pyrope at high pressure and high temperature (P-T) conditions to better understand its velocity profiles and anisotropies in the upper mantle. Analysis of the results shows that all of the elastic moduli increase almost linearly with increasing pressure at room temperature, and decrease linearly with increasing temperature at ambient pressure. At ambient conditions, the aggregate adiabatic bulk and shear moduli (KS0, G0) are 168.6(4) and 92.0(3) GPa, respectively. Compared to anhydrous pyrope, the presence of ~900 ppmw H2O in pyrope does not significantly affect its KS0 and G0 within their uncertainties. Using the third-order Eulerian finite-strain equation to model the elasticity data, the pressure derivatives of the bulk [(∂KS/∂P)T] and shear moduli [(∂G/∂P)T] at 300 K are derived as 4.6(1) and 1.3(1), respectively. Compared to previous BLS results of anhydrous pyrope, an addition of ~900 ppmw H2O in pyrope slightly increases the (∂KS/∂P)T, but has a negligible effect on the (∂G/∂P)T within their uncertainties. The temperature derivatives of the bulk and shear moduli at ambient pressure are (∂KS/∂T)P = –0.015(1) GPa/K and (∂G/∂T)P = –0.008(1) GPa/K, which are similar to those of anhydrous pyrope in previous BLS studies within their uncertainties. Meanwhile, our results also indicate that hydrous pyrope remains almost elastically isotropic at relevant high P-T conditions, and may have no significant contribution to seismic anisotropy in the upper mantle. In addition, we evaluated the seismic velocities (vP and vS) and the vP/vS ratio of hydrous pyrope along the upper mantle geotherm and a cold subducted slabs geotherm. It displays that hydrogen also has no significant effect on the seismic velocities and the vP/vS ratio of pyrope at the upper mantle conditions.

KeywordHydrous Pyrope Single-crystal Elasticity High Pressure And High Temperature Brillouin Light Scattering Upper Mantle
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10459
Collection地球内部物质高温高压实验室
Affiliation1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China
2.Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, U.S.A
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60437, U.S.A
Recommended Citation
GB/T 7714
Dawei Fan;Jingui Xu;Chang Lu;Sergey N. Tkachev;Bo Li;Zhiling Ye;Shijie Huang;Vitali B. Prakapenka;Wenge Zhou. Elasticity of single-crystal low water content hydrous pyrope at high-pressure and high-temperature conditions[J]. American Mineralogist,2019,104(7):1022–1031.
APA Dawei Fan;Jingui Xu;Chang Lu;Sergey N. Tkachev;Bo Li;Zhiling Ye;Shijie Huang;Vitali B. Prakapenka;Wenge Zhou.(2019).Elasticity of single-crystal low water content hydrous pyrope at high-pressure and high-temperature conditions.American Mineralogist,104(7),1022–1031.
MLA Dawei Fan;Jingui Xu;Chang Lu;Sergey N. Tkachev;Bo Li;Zhiling Ye;Shijie Huang;Vitali B. Prakapenka;Wenge Zhou."Elasticity of single-crystal low water content hydrous pyrope at high-pressure and high-temperature conditions".American Mineralogist 104.7(2019):1022–1031.
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