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Title: Ultrasonic Velocity of Diopside Liquid at High Pressure and Temperature: Constraints on Velocity Reduction in the Upper Mantle Due to Partial Melts

Abstract

Sound velocities of diopside liquid were determined at high pressures and temperatures up to 3.8 GPa and 2375 K, using the ultrasonic technique combined with synchrotron X–ray diffraction and imaging in a multianvil apparatus. Our results show that the sound velocity increases with pressure but is nearly independent of temperature. Using a Monte Carlo approach, the measured high–pressure sound velocities combined with ambient–pressure density provide tight constraints for the equation of state of diopside liquid, with a best–fit adiabatic bulk modulus (KS) of 23.8 ± 0.4 GPa and its pressure derivative (KS') of 7.5 ± 0.5. The calculated adiabatic temperature and density profile of diopside liquid suggest that a melt layer with diopside composition in the upper mantle would be gravitationally unstable and start to crystallize from the bottom of the layer during cooling. By comparing our results with previous acoustic measurements on silicate glasses, we demonstrate the important differences in sound velocities between silicate liquids and glasses and conclude that silicate glasses may not work as a good analog material for studying the acoustic properties of silicate liquids, as measurements on unrelaxed glasses do not capture the entropic contribution to the compressional properties of liquids. Here, we modeled velocitymore » reductions due to partial melts in the upper mantle using our results and found that for a given velocity reduction, the deeper the low–velocity region, the larger the melt fraction is required. Using silicate glass data for such estimation would result in a significant underestimation of melt fractions at high pressures.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [4]; ORCiD logo [4]
  1. Case Western Reserve Univ., Cleveland, OH (United States)
  2. Case Western Reserve Univ., Cleveland, OH (United States); Southern Univ. of Science and Technology, Guangdong (China)
  3. Case Western Reserve Univ., Cleveland, OH (United States); Univ. de Lille (France)
  4. Univ. of Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
OSTI Identifier:
1483881
Alternate Identifier(s):
OSTI ID: 1479621
Grant/Contract Number:  
FG02‐94ER14466; EAR‐1634415; EAR‐1619964
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 123; Journal Issue: 10; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; ultrasonic sound velocity; diopside liquid; high pressure; equation of state; low‐velocity regions

Citation Formats

Xu, Man, Jing, Zhicheng, Chantel, Julien, Jiang, Peixiu, Yu, Tony, and Wang, Yanbin. Ultrasonic Velocity of Diopside Liquid at High Pressure and Temperature: Constraints on Velocity Reduction in the Upper Mantle Due to Partial Melts. United States: N. p., 2018. Web. doi:10.1029/2018JB016187.
Xu, Man, Jing, Zhicheng, Chantel, Julien, Jiang, Peixiu, Yu, Tony, & Wang, Yanbin. Ultrasonic Velocity of Diopside Liquid at High Pressure and Temperature: Constraints on Velocity Reduction in the Upper Mantle Due to Partial Melts. United States. https://doi.org/10.1029/2018JB016187
Xu, Man, Jing, Zhicheng, Chantel, Julien, Jiang, Peixiu, Yu, Tony, and Wang, Yanbin. Sat . "Ultrasonic Velocity of Diopside Liquid at High Pressure and Temperature: Constraints on Velocity Reduction in the Upper Mantle Due to Partial Melts". United States. https://doi.org/10.1029/2018JB016187. https://www.osti.gov/servlets/purl/1483881.
@article{osti_1483881,
title = {Ultrasonic Velocity of Diopside Liquid at High Pressure and Temperature: Constraints on Velocity Reduction in the Upper Mantle Due to Partial Melts},
author = {Xu, Man and Jing, Zhicheng and Chantel, Julien and Jiang, Peixiu and Yu, Tony and Wang, Yanbin},
abstractNote = {Sound velocities of diopside liquid were determined at high pressures and temperatures up to 3.8 GPa and 2375 K, using the ultrasonic technique combined with synchrotron X–ray diffraction and imaging in a multianvil apparatus. Our results show that the sound velocity increases with pressure but is nearly independent of temperature. Using a Monte Carlo approach, the measured high–pressure sound velocities combined with ambient–pressure density provide tight constraints for the equation of state of diopside liquid, with a best–fit adiabatic bulk modulus (KS) of 23.8 ± 0.4 GPa and its pressure derivative (KS') of 7.5 ± 0.5. The calculated adiabatic temperature and density profile of diopside liquid suggest that a melt layer with diopside composition in the upper mantle would be gravitationally unstable and start to crystallize from the bottom of the layer during cooling. By comparing our results with previous acoustic measurements on silicate glasses, we demonstrate the important differences in sound velocities between silicate liquids and glasses and conclude that silicate glasses may not work as a good analog material for studying the acoustic properties of silicate liquids, as measurements on unrelaxed glasses do not capture the entropic contribution to the compressional properties of liquids. Here, we modeled velocity reductions due to partial melts in the upper mantle using our results and found that for a given velocity reduction, the deeper the low–velocity region, the larger the melt fraction is required. Using silicate glass data for such estimation would result in a significant underestimation of melt fractions at high pressures.},
doi = {10.1029/2018JB016187},
journal = {Journal of Geophysical Research. Solid Earth},
number = 10,
volume = 123,
place = {United States},
year = {Sat Oct 13 00:00:00 EDT 2018},
month = {Sat Oct 13 00:00:00 EDT 2018}
}

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Works referencing / citing this record: