Jadeite in Chelyabinsk meteorite and the nature of an impact event on its parent body.
Sci Rep
; 4: 5033, 2014 May 22.
Article
en En
| MEDLINE
| ID: mdl-24852082
ABSTRACT
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 3-12â
GPa and longer than 70â
ms, respectively. This suggests that an impactor larger than 0.15-0.19â
km in diameter collided with the Chelyabinsk parent body at a speed of at least 0.4-1.5â
km/s. This impact might have separated the Chelyabinsk asteroid from its parent body and delivered it to the Earth.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Sci Rep
Año:
2014
Tipo del documento:
Article
País de afiliación:
Japón