Инд. авторы:	Ozawa S., Miyahara M., Ohtani E., Koroleva O.N., Ito Y., Litasov K.D., Pokhilenko N.P.
Заглавие:	Jadeite in Chelyabinsk meteorite and the nature of an impact event on its parent body
Библ. ссылка:	Ozawa S., Miyahara M., Ohtani E., Koroleva O.N., Ito Y., Litasov K.D., Pokhilenko N.P. Jadeite in Chelyabinsk meteorite and the nature of an impact event on its parent body // Scientific Reports. - 2014. - Vol.4. - Art.5033. - ISSN 2045-2322.
Внешние системы:	DOI: 10.1038/srep05033; PubMed: 24852082; SCOPUS: 2-s2.0-84901386212; WoS: 000336207300009;
Реферат:	eng: 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.
Ключевые слова:	TRANSITIONS; CONSTRAINTS; TRANSFORMATIONS; ALBITE; AIRBURST; CALORIMETRIC MEASUREMENTS; L6 CHONDRITE; HIGH-PRESSURE MINERALS; MELT VEINS; NAALSI3O8;
Издано:	2014
Физ. характеристика:	5033