論文

査読有り
2022年6月

Shock Recovery With Decaying Compressive Pulses: Shock Effects in Calcite (CaCO 3 ) Around the Hugoniot Elastic Limit

Journal of Geophysical Research: Planets
  • Kosuke Kurosawa
  • ,
  • Haruka Ono
  • ,
  • Takafumi Niihara
  • ,
  • Tatsuhiro Sakaiya
  • ,
  • Tadashi Kondo
  • ,
  • Naotaka Tomioka
  • ,
  • Takashi Mikouchi
  • ,
  • Hidenori Genda
  • ,
  • Takuya Matsuzaki
  • ,
  • Masahiro Kayama
  • ,
  • Mizuho Koike
  • ,
  • Yuji Sano
  • ,
  • Masafumi Murayama
  • ,
  • Wataru Satake
  • ,
  • Takafumi Matsui

127
6
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1029/2021je007133
出版者・発行元
American Geophysical Union (AGU)

Abstract

Shock metamorphism of minerals in meteorites provides insights into the ancient Solar System. Calcite is an abundant aqueous alteration mineral in carbonaceous chondrites. Return samples from the asteroids Ryugu and Bennu are expected to contain calcite‐group minerals. Although shock metamorphism in silicates has been well studied, such data for aqueous alteration minerals are limited. Here, we investigated the shock effects in calcite with marble using impact experiments at the Planetary Exploration Research Center of Chiba Institute of Technology. We produced decaying compressive pulses with a smaller projectile than the target. A metal container facilitates recovery of a sample that retains its pre‐impact stratigraphy. We estimated the peak pressure distributions in the samples with the iSALE shock physics code. The capability of this method to produce shocked grains that have experienced different degrees of metamorphism from a single experiment is an advantage over conventional uniaxial shock recovery experiments. The shocked samples were investigated by polarizing microscopy and X‐ray diffraction analysis. We found that more than half of calcite grains exhibit undulatory extinction when peak pressure exceeds 3 GPa. This shock pressure is one order of magnitude higher than the Hugoniot elastic limit (HEL) of marble, but it is close to the HEL of a calcite crystal, suggesting that the undulatory extinction records dislocation‐induced plastic deformation in the crystal. Finally, we propose a strategy to re‐construct the maximum depth of calcite grains in a meteorite parent body, if shocked calcite grains are identified in chondrites and/or return samples from Ryugu and Bennu.

リンク情報
DOI
https://doi.org/10.1029/2021je007133
URL
https://onlinelibrary.wiley.com/doi/pdf/10.1029/2021JE007133
URL
https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JE007133
ID情報
  • DOI : 10.1029/2021je007133
  • ISSN : 2169-9097
  • eISSN : 2169-9100

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