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Title: Ultrafast olivine-ringwoodite transformation during shock compression
Authors: Okuchi, Takuo  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6907-0945 (unconfirmed)
Seto, Yusuke
Tomioka, Naotaka
Matsuoka, Takeshi
Albertazzi, Bruno
Hartley, Nicholas J.
Inubushi, Yuichi
Katagiri, Kento
Kodama, Ryosuke
Pikuz, Tatiana A.
Purevjav, Narangoo
Miyanishi, Kohei
Sato, Tomoko
Sekine, Toshimori
Sueda, Keiichi
Tanaka, Kazuo A.
Tange, Yoshinori
Togashi, Tadashi
Umeda, Yuhei
Yabuuchi, Toshinori
Yabashi, Makina
Ozaki, Norimasa
Author's alias: 奥地, 拓生
瀬戸, 雄介
富岡, 尚敬
松岡, 健之
犬伏, 雄一
片桐, 健登
兒玉, 了祐
宮西, 宏併
佐藤, 友子
関根, 利守
末田, 敬一
田中, 和夫
丹下, 慶範
梅田, 悠平
籔内, 俊毅
尾崎, 典雅
Keywords: Asteroids, comets and Kuiper belt
Mineralogy
Issue Date: 2021
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 12
Thesis number: 4305
Abstract: Meteorites from interplanetary space often include high-pressure polymorphs of their constituent minerals, which provide records of past hypervelocity collisions. These collisions were expected to occur between kilometre-sized asteroids, generating transient high-pressure states lasting for several seconds to facilitate mineral transformations across the relevant phase boundaries. However, their mechanisms in such a short timescale were never experimentally evaluated and remained speculative. Here, we show a nanosecond transformation mechanism yielding ringwoodite, which is the most typical high-pressure mineral in meteorites. An olivine crystal was shock-compressed by a focused high-power laser pulse, and the transformation was time-resolved by femtosecond diffractometry using an X-ray free electron laser. Our results show the formation of ringwoodite through a faster, diffusionless process, suggesting that ringwoodite can form from collisions between much smaller bodies, such as metre to submetre-sized asteroids, at common relative velocities. Even nominally unshocked meteorites could therefore contain signatures of high-pressure states from past collisions.
Description: 天体衝突を記録する結晶の生成を超高速計測 --レーザー衝撃圧縮実験による太陽系史の読解--. 京都大学プレスリリース. 2021-08-02.
Rights: © The Author(s) 2021
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/264621
DOI(Published Version): 10.1038/s41467-021-24633-4
PubMed ID: 34262045
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-08-02-1
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