Shock-Wave Experiment with the Chelyabinsk LL5 Meteorite: Experimental Parameters and the Texture of the Shock-Affected Material

Abstract

A spherical geometry shock experiment with the light-colored lithology material of the Chelyabinsk LL5 ordinary chondrite was carried out. The material was affected by shock and thermal metamorphism whose grade ranged from initial stage S3-4 to complete melting. The temperature and pressure were estimated at >2000°С and >90 GPa. The textural shock effects were studied by optical and electron microscopy. A single experimental impact has produced the whole the range of shock pressures and temperatures and, correspondingly, four zones identified by petrographic analysis: (1) a melt zone, (2) a zone of melting silicates, (3) a black ring zone, and (4) a zone of weakly shocked initial material. The following textural features of the material were identified: displacement of the metal and troilite phases from the central melt zone; the development of a zone of mixed lithology (light-colored fragments in silicate melt); the origin of a dark-colored lithology ring; and the generation of radiating shock veinlets. The experimental sample shows four textural zones that correspond to the different lithology types of the Chelyabinsk LL5 meteorite found in fragments of the meteoritic shower in the collection at the Ural Federal University. Our results prove that shock wave loading experiment can be successfully applied in modeling of space shocks and can be used to experimentally model processes at the small bodies of the solar system.

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ACKNOWLEDGMENTS

This study was financially supported by he Ministry of Education and Science of the Russian Federation (project nos. 5.3451.2017/4.6 and 5.4825.2017/6.7), Act 211 of the Government of the Russian Federation, Agreement 02.A03.21.0006, and the Russian Foundation for Basic Research, project no. 18-38-00598, and the Finnish Academy of Sciences project no. 293975.

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Correspondence to E. V. Petrova.

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Translated by E. Kurdyukov

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Petrova, E.V., Grokhovsky, V.I., Kohout, T. et al. Shock-Wave Experiment with the Chelyabinsk LL5 Meteorite: Experimental Parameters and the Texture of the Shock-Affected Material. Geochem. Int. 57, 923–930 (2019). https://doi.org/10.1134/S0016702919080081

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Keywords:

  • Chelyabinsk meteorite
  • ordinary chondrite
  • shock experiment
  • spherical shock
  • texture
  • structure
  • shock metamorphism