Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite

Sun, Ningyu; Mao, Zhu; Yan, Shuai; Wu, Xiang; Prakapenka, Vitali B.; Lin, Jung-Fu

doi:10.1002/2016JB013062

Title: Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO₃ perovskite

Journal Article · Mon Jul 04 00:00:00 EDT 2016 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2016JB013062· OSTI ID:1329403

Sun, Ningyu ^[1]; Mao, Zhu ^[2]; Yan, Shuai ^[1]; Wu, Xiang ^[3]; Prakapenka, Vitali B. ^[4]; Lin, Jung-Fu ^[5]

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)

In this study, we have examined the lower mantle composition and mineralogy by modeling the density (ρ), bulk sound velocity (V_Φ), and dlnρ/dlnV_Φ 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, V_Φ, and dlnρ/dlnV_Φ 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 V_Φ profiles in better agreement with preliminary reference Earth model than a lower mantle with a chondritic composition. The modeled ρ, V_Φ, and dlnρ/dlnV_Φ 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/dlnV_Φ 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: 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

Grant/Contract Number:: FG02-94ER14466; 41522403; 2014CB845904; WK2080000052; NSF-EAR- 446946; NSF-EAR-1502594; EAR-1128799

OSTI ID:: 1329403

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 121, Issue 7; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 24 works

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The uncertain major element bulk composition of Earth's mantle Williams, Q.; Knittle, E. Earth's Deep Mantle: Structure, Composition, and Evolution https://doi.org/10.1029/160GM12	book	January 2005

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Ferropericlase crystallization under upper mantle conditions Bulatov, V. K.; Girnis, A. V.; Brey, G. P. Contributions to Mineralogy and Petrology, Vol. 174, Issue 5 https://doi.org/10.1007/s00410-019-1582-6	journal	May 2019
Melting of CaSiO ₃ Perovskite at High Pressure Braithwaite, James; Stixrude, Lars Geophysical Research Letters, Vol. 46, Issue 4 https://doi.org/10.1029/2018gl081805	journal	February 2019

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58 GEOSCIENCES
pyrolitic lower mantle
chondritic lower mantle
density
bulk sound velocity
thermal equation of state
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Title: Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite

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Title: Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO₃ perovskite