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Chemical and physical properties of Zd'ár nad Sazavou L chondrite and porosity differentiation using computed tomography
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SYSNO ASEP 0534148 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Chemical and physical properties of Zd'ár nad Sazavou L chondrite and porosity differentiation using computed tomography Author(s) Kalasová, D. (CZ)
Zikmund, T. (CZ)
Spurný, Pavel (ASU-R) ORCID, RID
Haloda, J. (CZ)
Borovička, Jiří (ASU-R) RID, ORCID
Kaiser, J. (CZ)Source Title Meteoritics & Planetary Science. - : Wiley - ISSN 1086-9379
Roč. 55, č. 5 (2020), s. 1073-1081Number of pages 9 s. Publication form Online - E Language eng - English Country US - United States Keywords quantitative-analysis ; meteorite ; metamorphism Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) Method of publishing Limited access Institutional support ASU-R - RVO:67985815 UT WOS 000517778500001 EID SCOPUS 85080983038 DOI 10.1111/maps.13460 Annotation 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 Sazavou. 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2021 Electronic address https://doi.org/10.1111/maps.13460
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