High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle
Abstract Single‐crystal X‐ray diffraction and Brillouin spectroscopy experiments were performed on a natural Cr‐pyrope (Prp71.0Alm12.6Sps0.7Grs3.5Uvr12.2) at high pressure and high temperature up to 11.0 GPa and 800 K. Fitting the collected data to the third‐order finite strain equation yields bulk...
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Wiley
2022-08-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Online Access: | https://doi.org/10.1029/2022GC010393 |
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| author | Jingui Xu Dawei Fan Bo Li Sergey N. Tkachev Vitali B. Prakapenka Dongzhou Zhang Guangzhong Yang Yi Zhou Wenge Zhou |
| author_facet | Jingui Xu Dawei Fan Bo Li Sergey N. Tkachev Vitali B. Prakapenka Dongzhou Zhang Guangzhong Yang Yi Zhou Wenge Zhou |
| author_sort | Jingui Xu |
| collection | DOAJ |
| description | Abstract Single‐crystal X‐ray diffraction and Brillouin spectroscopy experiments were performed on a natural Cr‐pyrope (Prp71.0Alm12.6Sps0.7Grs3.5Uvr12.2) at high pressure and high temperature up to 11.0 GPa and 800 K. Fitting the collected data to the third‐order finite strain equation yields bulk modulus (KS0), shear modulus (G0), their pressure ((∂KS/∂P)T and (∂G/∂P)T) and temperature ((∂KS/∂T)P and (∂G/∂T)P) derivatives, KS0 = 167.7(8) GPa, G0 = 91.5(5) GPa, (∂KS/∂P)T = 4.3(1), (∂G/∂P)T = 1.4(1), (∂KS/∂T)P = −0.0175(1) GPa/K and (∂G/∂T)P = −0.0073(1) GPa/K. Using the obtained results, we examined whether the elastic properties of the Cr‐pyrope can be accurately calculated from those of endmembers including pyrope, almandine, grossular, and uvarovite assuming a linear relationship between elastic properties and composition (end‐member model). The results indicate that the end‐member model provides a sufficient approximation for the elastic properties of Cr‐pyrope in calculating the density and velocity of the subcontinental lithospheric mantle (SCLM). We modeled the densities and velocities of three typical types of SCLM (Archon, Proton, and Tecton) in order to investigate how the variation of chemical composition influences the SCLM. We obtained that the compositional change from the Archon to the Tecton increases the density of the SCLM significantly, which can be an important prerequisite for SCLM delamination. However, the compositional variation only slightly changes the velocity of the SCLM and the change is within the uncertainty of the calculation. Moreover, in comparison to the velocity, ρ/VP and ρ/VS are much more sensitive to the compositional change of the SCLM. |
| format | Article |
| id | doaj-art-b54adf5d17b54c7f8cec5af1dace8d36 |
| institution | DOAJ |
| issn | 1525-2027 |
| language | English |
| publishDate | 2022-08-01 |
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| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-b54adf5d17b54c7f8cec5af1dace8d362025-08-20T03:17:54ZengWileyGeochemistry, Geophysics, Geosystems1525-20272022-08-01238n/an/a10.1029/2022GC010393High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric MantleJingui Xu0Dawei Fan1Bo Li2Sergey N. Tkachev3Vitali B. Prakapenka4Dongzhou Zhang5Guangzhong Yang6Yi Zhou7Wenge Zhou8Key Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaKey Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaResearch Institute of Petroleum Exploration & Development‐Northwest (NWGI) PetroChina Lanzhou ChinaCenter for Advanced Radiation Sources University of Chicago Chicago IL USACenter for Advanced Radiation Sources University of Chicago Chicago IL USAHawai'i Institute of Geophysics and Planetology School of Ocean and Earth Science and Technology University of Hawai'i at Manoa Honolulu HI USAThe No. 101 Geological Brigade Geological and Mineral Exploration and Development Bureau of Guizhou Province Kaili ChinaSchool of Geoscience and Technology Southwest Petroleum University Chengdu ChinaKey Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaAbstract Single‐crystal X‐ray diffraction and Brillouin spectroscopy experiments were performed on a natural Cr‐pyrope (Prp71.0Alm12.6Sps0.7Grs3.5Uvr12.2) at high pressure and high temperature up to 11.0 GPa and 800 K. Fitting the collected data to the third‐order finite strain equation yields bulk modulus (KS0), shear modulus (G0), their pressure ((∂KS/∂P)T and (∂G/∂P)T) and temperature ((∂KS/∂T)P and (∂G/∂T)P) derivatives, KS0 = 167.7(8) GPa, G0 = 91.5(5) GPa, (∂KS/∂P)T = 4.3(1), (∂G/∂P)T = 1.4(1), (∂KS/∂T)P = −0.0175(1) GPa/K and (∂G/∂T)P = −0.0073(1) GPa/K. Using the obtained results, we examined whether the elastic properties of the Cr‐pyrope can be accurately calculated from those of endmembers including pyrope, almandine, grossular, and uvarovite assuming a linear relationship between elastic properties and composition (end‐member model). The results indicate that the end‐member model provides a sufficient approximation for the elastic properties of Cr‐pyrope in calculating the density and velocity of the subcontinental lithospheric mantle (SCLM). We modeled the densities and velocities of three typical types of SCLM (Archon, Proton, and Tecton) in order to investigate how the variation of chemical composition influences the SCLM. We obtained that the compositional change from the Archon to the Tecton increases the density of the SCLM significantly, which can be an important prerequisite for SCLM delamination. However, the compositional variation only slightly changes the velocity of the SCLM and the change is within the uncertainty of the calculation. Moreover, in comparison to the velocity, ρ/VP and ρ/VS are much more sensitive to the compositional change of the SCLM.https://doi.org/10.1029/2022GC010393 |
| spellingShingle | Jingui Xu Dawei Fan Bo Li Sergey N. Tkachev Vitali B. Prakapenka Dongzhou Zhang Guangzhong Yang Yi Zhou Wenge Zhou High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle Geochemistry, Geophysics, Geosystems |
| title | High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle |
| title_full | High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle |
| title_fullStr | High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle |
| title_full_unstemmed | High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle |
| title_short | High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle |
| title_sort | high pressure and high temperature single crystal elasticity of cr pyrope implications for the density and seismic velocity of subcontinental lithospheric mantle |
| url | https://doi.org/10.1029/2022GC010393 |
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