Chemical and physical properties of Žďár nad Sázavou L chondrite and porosity differentiation using computed tomography

1Dominika Kalasová,1Tomáš Zikmund,2Pavel Spurný,3Jakub Haloda,2Jiří Borovička,1Jozef Kaiser
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13460]
1CEITEC – Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno, Czech Republic
2Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic
3Czech Geological Survey, Geologická 6, 152 00 Prague, Czech Republic
Published by arrangement with John Wiley & Sons

A very bright and long bolide was observed over the eastern part of the Czech Republic during late local evening on December 9, 2014. This bolide was recorded by professional instruments in the Czech part of the European Fireball Network. Three meteorites weighing in total 87 g were found in the predicted area and were named Žďár nad Sázavou. The complete material composition of the meteorite was obtained from one cut‐off piece using petrography, mineralogy, and scanning electron microscopy (together with X‐ray energy dispersive spectroscopy and wavelength dispersive spectroscopy). X‐ray computed tomography (CT) was applied on all pieces for the determination of their grain and bulk density, digitization of shape, and examination of the structural homogeneity. CT has proved its important role for nondestructive exploration of brecciated meteorites formed by distinct lithologies or petrological types. In this article, we discuss its limits in terms of structural and material resolution based on the correlation of state‐of‐the‐art CT data and SEM images. Furthermore, we introduce a new way of air cavity quantification, which distinguishes the natural porosity of meteorite and cracks related to erosion processes. This helps to discuss the presence of weathering products based on comparison of the meteorite pieces found at different times after impact.

 

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