Mineralogy, reflectance spectra, and physical properties of the Chelyabinsk LL5 chondrite - Insight into shock-induced changes in asteroid regoliths / Kohout Tomas,Gritsevich Maria,Grokhovsky Victor I.,Yakovlev Grigoriy A.,Haloda Jakub,Halodova Patricie,Michallik Radoslaw M.,Penttila Antti,Muinonen Karri // ICARUS. - 2014. - V. 228, l. . - P. 78-85.

ISSN/EISSN:

0019-1035 / 1090-2643

Type:

Article

Abstract:

The mineralogy and physical properties of Chelyabinsk meteorites (fall, February 15, 2013) are presented. Three types of meteorite material are present, described as the light-colored, dark-colored, and impact-melt lithologies. All are of LL5 composition with the impact-melt lithology being close to whole-rock melt and the dark-colored lithology being shock-darkened due to partial melting of iron metal and sulfides. This enables us to study the effect of increasing shock on material with identical composition and origin. Based on the magnetic susceptibility, the Chelyabinsk meteorites are richer in metallic iron as compared to other LL chondrites. The measured bulk and grain densities and the porosity closely resemble other LL chondrites. Shock darkening does not have a significant effect on the material physical properties, but causes a decrease of reflectance and decrease in silicate absorption bands in the reflectance spectra. This is similar to the space weathering effects observed on asteroids. However, compared to space-weathered materials, there is a negligible to minor slope change observed in impact-melt and shock-darkened meteorite spectra. Thus, it is possible that some dark asteroids with invisible silicate absorption bands may be composed of relatively fresh shock-darkened chondritic material. (C) 2013 Elsevier Inc. All rights reserved.

Author keywords:

Meteorites; Regoliths; Asteroids METEORITES; DENSITY; POROSITY

DOI:

10.1016/j.icarus.2013.09.027

Web of Science ID:

ISI:000328665900007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN 15
Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
Address	525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Language	English
EISSN	1090-2643
Keywords-Plus	METEORITES; DENSITY; POROSITY
Research-Areas	Astronomy \& Astrophysics
Web-of-Science-Categories	Astronomy \& Astrophysics
Author-Email	tomas.kohout@helsinki.fi
ResearcherID-Numbers	Kohout, Tomas/C-1394-2008 Penttila, Antti/C-4886-2012 Halodova, Patricie/D-2726-2013 Gritsevich, Maria/M-7311-2016 Yakovlev, Grigoriy/F-8932-2017
ORCID-Numbers	Kohout, Tomas/0000-0003-4458-3650 Penttila, Antti/0000-0001-7403-1721 Gritsevich, Maria/0000-0003-4268-6277 Yakovlev, Grigoriy/0000-0002-7454-8912
Funding-Acknowledgement	Academy of Finland {[}257487, 260027]; Ministry of Education, Youth and Sports Czech Republic {[}LH12079]; Federal Grant-in-Aid Program {[}14.740.11.1006]; ERC {[}320773]
Funding-Text	The work was supported by Academy of Finland Projects Nos. 257487 and 260027 (SIRONTA), Ministry of Education, Youth and Sports Czech Republic Grant LH12079, Federal Grant-in-Aid Program GC No. 14.740.11.1006, and the ERC Advanced Grant No. 320773 (SAEMPL). Authors would like to thank to Ilya Weinstein for help with the measurements arrangements, to Pasi Heikkila, Alevtina Maksimova, Razilya Gizzatullina, Albina Zainullina, and Anastasia Uryvkova for help with the laboratory work, to Hanna Pentikainen for language corrections, and to three anonymous reviewers for constructive comments on the manuscript.
Number-of-Cited-References	19
Usage-Count-Since-2013	28
Journal-ISO	Icarus
Doc-Delivery-Number	275HC