Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102497
Title: Mineralogy, reflectance spectra, and physical properties of the Chelyabinsk LL5 chondrite - Insight into shock-induced changes in asteroid regoliths
Authors: Kohout, T.
Gritsevich, M.
Grokhovsky, V. I.
Yakovlev, G. A.
Haloda, J.
Halodova, P.
Michallik, R. M.
Penttilä, A.
Muinonen, K.
Issue Date: 2014
Citation: Mineralogy, reflectance spectra, and physical properties of the Chelyabinsk LL5 chondrite - Insight into shock-induced changes in asteroid regoliths / T. Kohout, M. Gritsevich, V. I. Grokhovsky, et al. — DOI 10.1016/j.icarus.2013.09.027 // Icarus. — 2014. — Vol. 228. — P. 78-85.
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. © 2013 Elsevier Inc.
Keywords: ASTEROIDS
METEORITES
REGOLITHS
URI: http://hdl.handle.net/10995/102497
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84886240912
PURE ID: 287649
284e0f00-d63d-4100-8e69-fa8ccc96a673
ISSN: 191035
DOI: 10.1016/j.icarus.2013.09.027
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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