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Title: High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle

Abstract

Abstract Single‐crystal X‐ray diffraction and Brillouin spectroscopy experiments were performed on a natural Cr‐pyrope (Prp 71.0 Alm 12.6 Sps 0.7 Grs 3.5 Uvr 12.2 ) 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 ( K S 0 ), shear modulus ( G 0 ), their pressure ((∂ K S /∂ P ) T and (∂ G /∂ P ) T ) and temperature (( ∂K S /∂T ) P and ( ∂G/∂T ) P ) derivatives, K S 0  = 167.7(8) GPa, G 0  = 91.5(5) GPa, (∂ K S /∂ P ) T  = 4.3(1), (∂ G /∂ P ) T  = 1.4(1), ( ∂K S /∂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 themore » 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 / V P and ρ / V S are much more sensitive to the compositional change of the SCLM.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5];  [6];  [7];  [2]
  1. Key Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang China, Hawai'i Institute of Geophysics and Planetology School of Ocean and Earth Science and Technology University of Hawai'i at Manoa Honolulu HI USA
  2. Key Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang China
  3. Research Institute of Petroleum Exploration &, Development‐Northwest (NWGI) PetroChina Lanzhou China
  4. Center for Advanced Radiation Sources University of Chicago Chicago IL USA
  5. Hawai'i Institute of Geophysics and Planetology School of Ocean and Earth Science and Technology University of Hawai'i at Manoa Honolulu HI USA
  6. The No. 101 Geological Brigade Geological and Mineral Exploration and Development Bureau of Guizhou Province Kaili China
  7. School of Geoscience and Technology Southwest Petroleum University Chengdu China
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1881038
Alternate Identifier(s):
OSTI ID: 1884333
Grant/Contract Number:  
DE‐FG02‐94ER14466
Resource Type:
Published Article
Journal Name:
Geochemistry, Geophysics, Geosystems
Additional Journal Information:
Journal Name: Geochemistry, Geophysics, Geosystems Journal Volume: 23 Journal Issue: 8; Journal ID: ISSN 1525-2027
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Xu, Jingui, Fan, Dawei, Li, Bo, Tkachev, Sergey N., Prakapenka, Vitali B., Zhang, Dongzhou, Yang, Guangzhong, Zhou, Yi, and Zhou, Wenge. High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle. United States: N. p., 2022. Web. doi:10.1029/2022GC010393.
Xu, Jingui, Fan, Dawei, Li, Bo, Tkachev, Sergey N., Prakapenka, Vitali B., Zhang, Dongzhou, Yang, Guangzhong, Zhou, Yi, & Zhou, Wenge. High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle. United States. https://doi.org/10.1029/2022GC010393
Xu, Jingui, Fan, Dawei, Li, Bo, Tkachev, Sergey N., Prakapenka, Vitali B., Zhang, Dongzhou, Yang, Guangzhong, Zhou, Yi, and Zhou, Wenge. Fri . "High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle". United States. https://doi.org/10.1029/2022GC010393.
@article{osti_1881038,
title = {High‐Pressure and High‐Temperature Single‐Crystal Elasticity of Cr‐Pyrope: Implications for the Density and Seismic Velocity of Subcontinental Lithospheric Mantle},
author = {Xu, Jingui and Fan, Dawei and Li, Bo and Tkachev, Sergey N. and Prakapenka, Vitali B. and Zhang, Dongzhou and Yang, Guangzhong and Zhou, Yi and Zhou, Wenge},
abstractNote = {Abstract Single‐crystal X‐ray diffraction and Brillouin spectroscopy experiments were performed on a natural Cr‐pyrope (Prp 71.0 Alm 12.6 Sps 0.7 Grs 3.5 Uvr 12.2 ) 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 ( K S 0 ), shear modulus ( G 0 ), their pressure ((∂ K S /∂ P ) T and (∂ G /∂ P ) T ) and temperature (( ∂K S /∂T ) P and ( ∂G/∂T ) P ) derivatives, K S 0  = 167.7(8) GPa, G 0  = 91.5(5) GPa, (∂ K S /∂ P ) T  = 4.3(1), (∂ G /∂ P ) T  = 1.4(1), ( ∂K S /∂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 / V P and ρ / V S are much more sensitive to the compositional change of the SCLM.},
doi = {10.1029/2022GC010393},
journal = {Geochemistry, Geophysics, Geosystems},
number = 8,
volume = 23,
place = {United States},
year = {Fri Aug 12 00:00:00 EDT 2022},
month = {Fri Aug 12 00:00:00 EDT 2022}
}

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