Variability of Chelyabinsk meteoroid stones studied by Mössbauer spectroscopy and X-ray diffraction

M. I. Oshtrakh, A. A. Maksimova, A. V. Chukin, E. V. Petrova, P. Jenniskens, E. Kuzmann, V. I. Grokhovsky, Z. Homonnay, V. A. Semionkin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The meter-scale variations of material properties of the 20-m sized Chelyabinsk meteoroid are critical for understanding why the meteoroid fragmented the way it did and caused the devastating airburst that sent over 1600 people to the hospital for treatment of glass cuts and minor injuries on February 15, 2013. From a range of differently looking unweathered meteorite fragments that were recovered shortly after the event, these material differences were probed by means of optical and scanning electron microscopy, X-ray diffraction (XRD), and the high velocity resolution Mössbauer spectroscopy. All main and some minor iron-bearing phases were identified on the basis of XRD data and Mössbauer spectra. The Fe 2+ partitioning between the M1 and M2 sites in silicate phases was determined independently using XRD and Mössbauer data. Different meteorite fragments show a range of 570–1180 K in the temperature of the Fe 2+ and Mg 2+ equilibrium distribution between the M1 and M2 sites in olivine, while that in orthopyroxene falls in the range 870–1180 K (these ranges were estimated using both techniques). This fact points out a slightly different thermal history of these minerals before they accumulated in different parts of the Chelyabinsk meteoroid. The Chelyabinsk meteoroid is a fragmental breccia from materials formed at different depths in their parent body, or from materials that experienced different annealing temperatures in impacts. In addition, the fusion crust from two fragments, studied by XRD and Mössbauer spectroscopy, experienced a different thermal history during entry, suggesting that the fragment with mixed light and dark lithologies was located deeper inside the initial meteoroid than the fragment with only light lithology, or fragmented less readily.

Original languageEnglish
Pages (from-to)206-224
Number of pages19
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume219
DOIs
Publication statusPublished - Aug 5 2019

Fingerprint

meteoroids
fragments
Spectroscopy
rocks
Meteorites
X ray diffraction
Lithology
diffraction
spectroscopy
lithology
meteorites
x rays
Bearings (structural)
Silicates
Olivine
histories
breccia
Minerals
Materials properties
Fusion reactions

Keywords

  • Chelyabinsk meteoroid
  • Fragments with different lithologies
  • Mössbauer spectroscopy
  • Thermal history
  • X-ray diffraction

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

Cite this

Variability of Chelyabinsk meteoroid stones studied by Mössbauer spectroscopy and X-ray diffraction. / Oshtrakh, M. I.; Maksimova, A. A.; Chukin, A. V.; Petrova, E. V.; Jenniskens, P.; Kuzmann, E.; Grokhovsky, V. I.; Homonnay, Z.; Semionkin, V. A.

In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 219, 05.08.2019, p. 206-224.

Research output: Contribution to journalArticle

Oshtrakh, M. I. ; Maksimova, A. A. ; Chukin, A. V. ; Petrova, E. V. ; Jenniskens, P. ; Kuzmann, E. ; Grokhovsky, V. I. ; Homonnay, Z. ; Semionkin, V. A. / Variability of Chelyabinsk meteoroid stones studied by Mössbauer spectroscopy and X-ray diffraction. In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2019 ; Vol. 219. pp. 206-224.
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AU - Petrova, E. V.

AU - Jenniskens, P.

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