Bulletin Mineralogie Petrologie

Myšľan Pavol, Ružička Peter, Mikuš Tomáš, Hain Miroslav

Ročník 28, číslo 2 (2020), strana 246-260

DOI: https://doi.org/10.46861/bmp.28.246

X-ray microtomography, 3D distribution, mineral inclusions, garnet, Lesné - Potičky, Beňatinská voda, Slovak Republic

Visualization of garnets and their mineral inclusions was performed by X-ray microtomography by reconstructing 3D image from 1800 measured 2D X-ray projections. Visualization procedure of 3D distribution of mineral inclusions was based on the different absorption of X-ray radiation between the host garnet and mineral inclusions. 3D visualization provided a realistic picture of a distribution of the 126 identified mineral inclusions in garnet from rhyolite and rhyodacite Beňatinská voda and 21 inclusions in garnet from Lesné - Potičky (Slovak Republic). Composition of garnet from locality Lesné - Potičky is Alm_71.0-73.7Prp_8.3-9.0Grs_14.7-16.6 and from locality Beňatinská voda is Alm_72.1-73.2 Prp_5.5-5.9Grs_18.3-19.4. Mineral inclusions in garnets from locality Lesné - Potičky are represented by fluorapatite, zircon, ilmenite, annite and magmatic melts preserved in the form of glass inclusions trapped in apatite inclusions. Mineral inclusions in garnets from locality Beňatinská voda are represented by fluorapatite, zircon and plagioclase An_78.53-57.12. Chemical composition of zircons and fluorapatites are similar from both localities. Based on the chemical composition, the high-pressure origin of garnets associated with I-type magmas was confirmed.

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