# Experimental constraints on the shock history of CI chondrites and Ryugu grains

https://mdr.nims.go.jp/datasets/0406d77e-c0a1-42ba-b65e-e66c931fa4b1

## File

- [MS_Ver_12_リポジトリ.pdf](https://mdr.nims.go.jp/filesets/9450f250-6e46-4b97-82f5-65faf55bb55a/download) ([Detail](https://mdr.nims.go.jp/filesets/9450f250-6e46-4b97-82f5-65faf55bb55a.md))

## Id

0406d77e-c0a1-42ba-b65e-e66c931fa4b1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-02T06:05:10.765547Z

## Updated at

2025-09-03T03:30:28.783332Z

## Published at

2025-09-03T03:20:33.153887Z

## Doi

https://doi.org/10.48505/nims.5726

## First published url

https://doi.org/10.1016/j.epsl.2025.119559

## Date published

2025-07-26

## Recorded date published

2025-10

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Experimental constraints on the shock history of CI chondrites and Ryugu
    grains
  title_type: original
  lang: en

## Description

- description: "C-type asteroids, which make up a significant portion of the main
    belt asteroids, are\r\nbelieved to be composed of materials similar to CI and
    CM carbonaceous chondrites.\r\nIn this study, we conducted shock recovery experiments
    on Orgueil CI and CI affinity\r\nYamato 980115 CY (partly dehydrated CI) chondrites
    to examine their mineralogical\r\nand textural changes under impact conditions.
    Our results indicate that weak shock\r\npressures below ~4 GPa do not produce
    significant shock metamorphic features,\r\nsupporting the current interpretation
    that most Ryugu grains experienced shock\r\npressures within this range. Above
    ~4 GPa, dehydration and degassing of Mg-Fe\r\nphyllosilicates and carbonaceous
    materials become dominant, leading to rock\r\nexfoliation. Rock melting begins
    above ~10 GPa, forming frothy layers composed of\r\niron-rich amorphous material.
    These findings suggest that the regolith layer of asteroid\r\nRyugu was primarily
    formed by the reassembly of rock fragments exfoliated by impacts\r\nwithout undergoing
    strong shock metamorphism. However, highly shocked materials\r\nmay be buried
    beneath the regolith layer, highlighting the need for further\r\ninvestigations
    into the interior composition of C-type asteroids to better understand\r\ntheir
    thermal and impact histories."
  description_type: abstract
  lang: und

## Creator

- name: Toru Nakahashi
  role: author
- name: Masaaki Miyahara
  role: author
  orcid: https://orcid.org/0000-0002-4404-9813
- name: Akira Yamaguchi
  role: author
  orcid: https://orcid.org/0000-0001-5140-7853
- name: Takamichi Kobayashi
  role: author
- name: Hitoshi Yusa
  role: author
  orcid: https://orcid.org/0000-0001-6980-9279
- name: Masashi Miyakawa
  role: author
  orcid: https://orcid.org/0000-0002-0838-8156
- name: Naotaka Tomioka
  role: author
- name: Yuto Takaki
  role: author
- name: Takaaki Noguchi
  role: author
  orcid: https://orcid.org/0000-0001-7211-2595
- name: Toru Matsumoto
  role: author
- name: Akira Miyake
  role: author
  orcid: https://orcid.org/0000-0002-6197-4656
- name: Yohei Igami
  role: author
  orcid: https://orcid.org/0000-0003-4512-7104
- name: Yusuke Seto
  role: author
  orcid: https://orcid.org/0000-0002-5423-2136

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: CI chondrite
  schema: not_defined
- subject: Impact process
  schema: not_defined
- subject: Shock experiment
  schema: not_defined
- subject: Shock metamorphism
  schema: not_defined
- subject: Asteroid Ryugu
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Earth and Planetary Science Letters
  issn: '0012821X'
  volume: '668'
  article_number: '119559'

## Conference



## Related item



## Funding



## 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: 9450f250-6e46-4b97-82f5-65faf55bb55a
  filename: MS_Ver_12_リポジトリ.pdf
  content_type: application/pdf
  size: 19906295
  md5: 840caa35ace5d49e0c7d9ed6240b186f

## Thumbnail

fileset_id: 9450f250-6e46-4b97-82f5-65faf55bb55a
filename: MS_Ver_12_リポジトリ.pdf