Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite
Abstract
In this study, we have examined the lower mantle composition and mineralogy by modeling the density (ρ), bulk sound velocity (VΦ), and dlnρ/dlnVΦ profiles of candidate lower mantle minerals using literature and new experimental equation of state (EoS) results. Additionally, for CaSiO3 perovskite, complimentary synchrotron X-ray diffraction measurements in a laser-heated diamond anvil cell were conducted up to 156 GPa between 1200 K and 2600 K to provide more reliable constraints on the thermal EoS parameters. These new experimental results as well as literature P-V-T data sets are systematically analyzed using an internally self-consistent pressure scale. We have modeled ρ, VΦ, and dlnρ/dlnVΦ profiles of the lower mantle with representative pyrolitic and chondritic compositional models in which the effect of Fe spin transition in ferropericlase is also taken into account. Our modeling results show that a pyrolitic lower mantle with an aggregate mineralogy of 75 vol % bridgmanite, 17 vol % ferropericlase, and 8 vol % CaSiO3 perovskite produces ρ and VΦ profiles in better agreement with preliminary reference Earth model than a lower mantle with a chondritic composition. The modeled ρ, VΦ, and dlnρ/dlnVΦ are mainly affected by the relative ratio of bridgmanite and ferropericlase but are not sensitivemore »
- Authors:
-
- Univ. of Science and Technology of China, Hefei (China)
- Univ. of Science and Technology of China, Hefei (China); National Geophysics Observatory, Mengcheng (China)
- China Univ. of Geosciences, Wuhan (China)
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
- Univ. of Texas, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- National Natural Science Foundation of China (NSFC); National Basic Research Program of China; Fundamental Research Funds for the Central Universities in China; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- OSTI Identifier:
- 1329403
- Grant/Contract Number:
- FG02-94ER14466; 41522403; 2014CB845904; WK2080000052; NSF-EAR- 446946; NSF-EAR-1502594; EAR-1128799
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 7; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; pyrolitic lower mantle; chondritic lower mantle; density; bulk sound velocity; thermal equation of state; CaSiO3 perovskite
Citation Formats
Sun, Ningyu, Mao, Zhu, Yan, Shuai, Wu, Xiang, Prakapenka, Vitali B., and Lin, Jung-Fu. Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite. United States: N. p., 2016.
Web. doi:10.1002/2016JB013062.
Sun, Ningyu, Mao, Zhu, Yan, Shuai, Wu, Xiang, Prakapenka, Vitali B., & Lin, Jung-Fu. Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite. United States. https://doi.org/10.1002/2016JB013062
Sun, Ningyu, Mao, Zhu, Yan, Shuai, Wu, Xiang, Prakapenka, Vitali B., and Lin, Jung-Fu. Mon .
"Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite". United States. https://doi.org/10.1002/2016JB013062. https://www.osti.gov/servlets/purl/1329403.
@article{osti_1329403,
title = {Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite},
author = {Sun, Ningyu and Mao, Zhu and Yan, Shuai and Wu, Xiang and Prakapenka, Vitali B. and Lin, Jung-Fu},
abstractNote = {In this study, we have examined the lower mantle composition and mineralogy by modeling the density (ρ), bulk sound velocity (VΦ), and dlnρ/dlnVΦ profiles of candidate lower mantle minerals using literature and new experimental equation of state (EoS) results. Additionally, for CaSiO3 perovskite, complimentary synchrotron X-ray diffraction measurements in a laser-heated diamond anvil cell were conducted up to 156 GPa between 1200 K and 2600 K to provide more reliable constraints on the thermal EoS parameters. These new experimental results as well as literature P-V-T data sets are systematically analyzed using an internally self-consistent pressure scale. We have modeled ρ, VΦ, and dlnρ/dlnVΦ profiles of the lower mantle with representative pyrolitic and chondritic compositional models in which the effect of Fe spin transition in ferropericlase is also taken into account. Our modeling results show that a pyrolitic lower mantle with an aggregate mineralogy of 75 vol % bridgmanite, 17 vol % ferropericlase, and 8 vol % CaSiO3 perovskite produces ρ and VΦ profiles in better agreement with preliminary reference Earth model than a lower mantle with a chondritic composition. The modeled ρ, VΦ, and dlnρ/dlnVΦ are mainly affected by the relative ratio of bridgmanite and ferropericlase but are not sensitive to the variation of the CaSiO3 perovskite content. In addition, the spin crossover of Fe in ferropericlase can greatly raise the value of dlnρ/dlnVΦ in the middle lower mantle, which is useful in detecting the presence of ferropericlase in the region. Based on these new mineral physical constraints and radial seismic structure, our study suggests the lower mantle is pyrolitic, which is chemically indistinguishable from the upper mantle.},
doi = {10.1002/2016JB013062},
journal = {Journal of Geophysical Research. Solid Earth},
number = 7,
volume = 121,
place = {United States},
year = {Mon Jul 04 00:00:00 EDT 2016},
month = {Mon Jul 04 00:00:00 EDT 2016}
}
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