Chemical and physical properties of Zd'ár nad Sazavou L chondrite and porosity differentiation using computed tomography

0534148 - ASÚ 2021 RIV US eng J - Článek v odborném periodiku
Kalasová, D. - Zikmund, T. - Spurný, Pavel - Haloda, J. - Borovička, Jiří - Kaiser, J.
Chemical and physical properties of Zd'ár nad Sazavou L chondrite and porosity differentiation using computed tomography.
Meteoritics & Planetary Science. Roč. 55, č. 5 (2020), s. 1073-1081. ISSN 1086-9379. E-ISSN 1945-5100
Grant ostatní: AV ČR(CZ) AP1202
Program: Akademická prémie - Praemium Academiae
Institucionální podpora: RVO:67985815
Klíčová slova: quantitative-analysis * meteorite * metamorphism
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 2.487, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1111/maps.13460

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.
Trvalý link: http://hdl.handle.net/11104/0312378