# Cold SiO2-rich slabs reaching the CMB revealed by the seifertite phase boundary

https://mdr.nims.go.jp/datasets/e1e06d35-da70-4a68-9f45-ed80f91763db

## File

- [2026-Sinmyo-et-al.pdf](https://mdr.nims.go.jp/filesets/7e5557fb-c93f-4cac-bf46-e7d6a938c3bf/download) ([Detail](https://mdr.nims.go.jp/filesets/7e5557fb-c93f-4cac-bf46-e7d6a938c3bf.md))

## Id

e1e06d35-da70-4a68-9f45-ed80f91763db

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-08-31T08:48:37.873186Z

## Updated at

2026-08-31T08:52:18.208476Z

## Published at

2026-09-01T01:26:48.755009Z

## Doi



## First published url

https://doi.org/10.1038/s41598-026-54731-6

## Date published

2026-05-30

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Cold SiO2-rich slabs reaching the CMB revealed by the seifertite phase boundary
  title_type: original
  lang: en

## Description

- description: A cold silica (SiO2)-rich subducted slab creates notable heterogeneity
    above the core-mantle boundary (CMB), influencing the evolution of the Earth’s
    mantle. This slab may exhibit characteristic anomalies in the longitudinal and
    shear wave seismic velocity above the CMB, attributed to the SiO2 phase transition
    into its dense polymorph, seifertite. However, the transition depth remains unclear
    due to the often-observed metastable phases in experiments. To address this long-standing
    challenge, we conducted laser-heated diamond anvil cell experiments with synchronised
    rapid X-ray diffraction measurements alongside theoretical calculations. The slope
    of the seifertite phase boundary was less steep than previously estimated, and
    consequently, the temperature profile of the slab crosses the boundary twice,
    like the post-perovskite transition. We observed a decrease in shear wave velocity
    beneath Hawaii and Central America, and we found anti-correlation in seismic wave
    velocities matching the depth range of the seifertite transition in a cold slab
    beneath Central America. This may provide evidence that a cold SiO2-rich slab
    descends towards the CMB.
  description_type: abstract
  lang: und

## Creator

- name: Ryosuke Sinmyo
  role: author
- name: Saori Kawaguchi-Imada
  role: author
- name: Rei Sato
  role: author
- name: Keisuke Otsuru
  role: author
- name: Kenji Kawai
  role: author
- name: Hiroshi Sakuma
  role: author
  orcid: https://orcid.org/0000-0002-6522-0704
- name: Shigeru Suehara
  role: author
  orcid: https://orcid.org/0000-0001-7423-2830
- name: Takayuki Ishii
  role: author
- name: Shuhou Maitani
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: DFT
  schema: not_defined
- subject: Seifertite
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Scientific Reports
  issn: '20452322'
  volume: '16'
  issue: '1'
  article_number: '26394'

## Conference



## Related item



## Funding

- identifier: JPJS00420230010
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 7e5557fb-c93f-4cac-bf46-e7d6a938c3bf
  filename: 2026-Sinmyo-et-al.pdf
  content_type: application/pdf
  size: 2131612
  md5: 28db327a14f1527a07483fcf894f1804

## Thumbnail

fileset_id: 7e5557fb-c93f-4cac-bf46-e7d6a938c3bf
filename: 2026-Sinmyo-et-al.pdf