Ultrafast olivine-ringwoodite transformation during shock compression - Sorbonne Université
Journal Articles Nature Communications Year : 2021

Ultrafast olivine-ringwoodite transformation during shock compression

Takuo Okuchi
  • Function : Author
  • PersonId : 1105685
Yusuke Seto
  • Function : Author
Tomoko Sato
  • Function : Author

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.
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Dates and versions

hal-03290135 , version 1 (19-07-2021)

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Takuo Okuchi, Yusuke Seto, Naotaka Tomioka, Takeshi Matsuoka, Bruno Albertazzi, et al.. Ultrafast olivine-ringwoodite transformation during shock compression. Nature Communications, 2021, 12, pp.4305. ⟨10.1038/s41467-021-24633-4⟩. ⟨hal-03290135⟩
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