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Title: Poirierite, a dense metastable polymorph of magnesium iron silicate in shocked meteorites
Authors: Tomioka, Naotaka
Bindi, Luca
Okuchi, Takuo  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6907-0945 (unconfirmed)
Miyahara, Masaaki
Iitaka, Toshiaki
Li, Zhi
Kawatsu, Tsutomu
Xie, Xiande
Purevjav, Narangoo
Tani, Riho
Kodama, Yu
Author's alias: 富岡, 尚敬
奥地, 拓生
宮原, 正明
飯高, 敏晃
河津, 励
谷, 理帆
兒玉, 優
Keywords: Meteoritics
Mineralogy
Issue Date: 22-Jan-2021
Publisher: Springer Nature
Journal title: Communications Earth & Environment
Volume: 2
Thesis number: 16
Abstract: A dense magnesium iron silicate polymorph with a structure intermediate between olivine, ringwoodite, and wadsleyite was theoretically predicted about four decades ago. As this group of minerals constitute the major component of shocked meteorites, constraining their transitional forms and behaviour is of potential importance for understanding impact events on their parent bodies. Here we use high-resolution transmission electron microscopy techniques and single-crystal X-ray diffraction analyses to identify naturally occurring examples of this mineral – recently named poirierite – in shocked chondritic meteorites. We observe nanoscale lamellar poirierite topotactically intergrown within wadsleyite, and additionally within ringwoodite as recently reported. Our results confirm the intermediate structure of poirierite and suggest it might be a relay point in the shear transformations between its polymorphs. We propose that poirierite formed during rapid decompression at relatively low temperature in retrograde shock metamorphism of the meteorites.
Description: 宇宙から飛来した隕石から新鉱物ポワリエライトを発見 --小天体の衝突過程、地球内部の変化等を探る重要な鍵に--. 京都大学プレスリリース. 2021-01-25.
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. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/261142
DOI(Published Version): 10.1038/s43247-020-00090-7
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-01-25-2
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