Structural Transitions in MgSiO3 Glasses and Melts at the Core-Mantle Boundary Observed via Inelastic X-ray Scattering

Kim, Yong‐Hyun; Yi, Yoo Soo; Kim, Hyo‐Im; Chow, Paul; Xiao, Yuming; Shen, Guoyin; Lee, Sung Keun

doi:10.1029/2019GL085889

Title: Structural Transitions in MgSiO₃ Glasses and Melts at the Core-Mantle Boundary Observed via Inelastic X-ray Scattering

Journal Article · Mon Dec 16 00:00:00 EST 2019 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2019GL085889· OSTI ID:1606250

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Seoul National Univ. (South Korea)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), HPCAT

The structural adaptation in MgSiO₃ melts under compression up to 130 GPa is the key to revealing the origins of the pronounced negative buoyancy of the melts at the core-mantle boundary (CMB). A full understanding of the melt densification requires study of the pressure-induced changes in the bonding configuration around oxygen at the CMB, which has proven to be difficult to measure. Here, the experimental breakthrough in O K-edge inelastic X-ray scattering enables collection of the spectra of MgSiO₃ glasses up to ~130 GPa, along with ab initio molecular dynamics simulations, revealing the electronic bonding transitions around heavily compressed oxygen. We report the spectral results indicate the emergence of denser network structures around oxygen, stemming from contractions in the Mg-O and O-O distances associated with flexible topological and short-range rearrangements around Si. The results unveil the electronic structure and thus the nature of densification in dense partial melts at the CMB.

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

Sponsoring Organization:: National Research Foundation of Korea (NRF); USDOE National Nuclear Security Administration (NNSA), Office of Experimental Sciences (NA-113); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; 2017R1A2A1A17069511; 2017H1A2A1042446; AC02‐06CH11357

OSTI ID:: 1606250

Alternate ID(s):: OSTI ID: 1577411

Journal Information:: Geophysical Research Letters, Vol. 46, Issue 23; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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58 GEOSCIENCES
MgSiO3 glasses and melts under compression
core‐mantle boundary
inelastic X‐ray scattering

Title: Structural Transitions in MgSiO3 Glasses and Melts at the Core-Mantle Boundary Observed via Inelastic X-ray Scattering

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Title: Structural Transitions in MgSiO₃ Glasses and Melts at the Core-Mantle Boundary Observed via Inelastic X-ray Scattering