Jadeite in Chelyabinsk meteorite and the nature of an impact event on its parent body

Shin Ozawa, Masaaki Miyahara, Eiji Ohtani, Olga N. Koroleva, Yoshinori Ito, Konstantin D. Litasov, Nikolay P. Pokhilenko

研究成果: Article査読

36 被引用数 (Scopus)

抄録

The Chelyabinsk asteroid impact is the second largest asteroid airburst in our recorded history. To prepare for a potential threat from asteroid impacts, it is important to understand the nature and formational history of Near-Earth Objects (NEOs) like Chelyabinsk asteroid. In orbital evolution of an asteroid, collision with other asteroids is a key process. Here, we show the existence of a high-pressure mineral jadeite in shock-melt veins of Chelyabinsk meteorite. Based on the mineral assemblage and calculated solidification time of the shock-melt veins, the equilibrium shock pressure and its duration were estimated to be at least 3- 12 GPa and longer than 70 ms, respectively. This suggests that an impactor larger than 0.15-0.19 km in diameter collided with the Chelyabinsk parent body at a speed of at least 0.4-1.5 km/s. This impact might have separated the Chelyabinsk asteroid from its parent body and delivered it to the Earth.

本文言語English
論文番号5033
ジャーナルScientific reports
4
DOI
出版ステータスPublished - 2014 5 22

ASJC Scopus subject areas

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