Thermal Equations of State of Magnesite: Implication for the Complex Mid‐Lower Mantle Seismic Scatterers

Yu, Yingxin; Sun, Ningyu; Mao, Zhu; Li, Luo; Prakapenka, Vitali B.; Lin, Jung‐Fu

doi:10.1029/2023JB028026

Title: Thermal Equations of State of Magnesite: Implication for the Complex Mid‐Lower Mantle Seismic Scatterers

Journal Article · Thu Feb 01 00:00:00 EST 2024 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1029/2023JB028026· OSTI ID:2311898

^[1]; Sun, Ningyu ^[1];

^[2];

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^[3];

^[4]

Deep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei China
Deep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei China, CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Hefei China, Frontiers Science Center for Planetary Exploration and Emerging Technologies University of Science and Technology of China Hefei China
Center for Advanced Photon Sources The University of Chicago Chicago IL USA
Department of Earth and Planetary Sciences Jackson School of Geosciences The University of Texas at Austin Austin TX USA

Abstract Magnesite (MgCO ₃ ) entering the lower mantle together with the subducted oceanic crust is an important carbon carrier. The reaction between magnesite and mantle minerals has been documented, but its influence on the density and velocity profiles of lower mantle remains unexplored. To decipher the deep carbon transportation and its associated effect, here we determined the thermal equations of state of magnesite up to 120 GPa and 2600 K using X‐ray diffraction in laser‐heated diamond anvil cells. The obtained thermal elastic parameters of magnesite facilitated a comprehensive understanding on the influence of magnesite‐SiO ₂ reaction, variation of carbon and SiO ₂ content, and temperature on the origin of lower‐mantle scatterers at 1,000–1,800 km depth. Our modeling revealed that the depth of the lower‐mantle V _S scatterers is mainly controlled by the Al ₂ O ₃ content in SiO ₂ , while its magnitude depends on the SiO ₂ content. Along normal geotherm, the magnesite‐SiO ₂ reaction would occur before the post‐stishovite transition, consuming substantial SiO ₂ in the subducted oceanic crust. Depending on the amount of residual SiO ₂ , the post‐stishovite transition can produce a 2.5–5.2 (2)% V _S reduction, compatible with the observed seismic scatterers in Izu‐Bonin and Mariana subduction zones. Along slab geotherm, this reaction occurs after the post‐stishovite transition, generating a greater V _S reduction of 4.4–6.4 (4)%. We thus propose that the reaction between sinking MgCO ₃ and SiO ₂ in the slab is one of the potential factors influencing the magnitude of the lower‐ V s scatterers at 1,000–1,900 km depth. Our results provide new insights into the deep‐mantle carbonate transportation influencing regional geophysics.

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Sponsoring Organization:: USDOE

OSTI ID:: 2311898

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Vol. 129 Journal Issue: 2; ISSN 2169-9313

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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