Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)
Intensively metasomatized rocks from serpentinized ultramafic tectonic fragments in Dobšiná, Western Carpathians, consist of typical rodingite mineral association: hydrated garnet, vesuvianite, diopside and clinochlore. Electron microprobe analysis (EMPA) and Micro-Raman analyses of the main mineral...
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doaj-12d315e5276049358bd0089e552f46092021-02-12T09:07:19ZengMDPI AGMinerals2075-163X2021-02-011118918910.3390/min11020189Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)Juraj Butek0Ján Spišiak1Stanislava Milovská2Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 97400 Banská Bystrica, SlovakiaFaculty of Natural Sciences, Matej Bel University, Tajovského 40, 97400 Banská Bystrica, SlovakiaEarth Science Institute of the Slovak Academy of Sciences, Ďumbierska 1, 97401 Banská Bystrica, SlovakiaIntensively metasomatized rocks from serpentinized ultramafic tectonic fragments in Dobšiná, Western Carpathians, consist of typical rodingite mineral association: hydrated garnet, vesuvianite, diopside and clinochlore. Electron microprobe analysis (EMPA) and Micro-Raman analyses of the main minerals evidence complex mineralogical evolution and variable mineral chemistry. Garnet solid solution is dominated by grossular-andradite series, which demonstrates a significant degree of hydration, mainly for grossular rich garnet cores. Garnet is locally enriched in TiO<sub>2</sub> (up to 13 wt%), possibly indicating a chemical relic of a Ti-oxide mineral. Younger, andradite-richer garnet rims demonstrate a low degree of hydration, suggesting a harder incorporation of an (OH)<sup>−</sup> anion into its crystal structure. Garnet chemical variations display an ideal negative correlation between Al and (Fe<sup>3+</sup> + Ti). The most recent mineral phase is represented by euhedral vesuvianite (± chlorite), which crystallizes at the expense of the garnet solid solution. This reaction shows a well-equilibrated character and indicates a high extent of rodingitization process. Chlorite thermometry models suggest an average temperature of late rodingite (trans) formation of about 265 °C.https://www.mdpi.com/2075-163X/11/2/189rodingitehydrogrossulargarnetvesuvianitemicro-Raman spectraDobšiná |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Juraj Butek Ján Spišiak Stanislava Milovská |
spellingShingle |
Juraj Butek Ján Spišiak Stanislava Milovská Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) Minerals rodingite hydrogrossular garnet vesuvianite micro-Raman spectra Dobšiná |
author_facet |
Juraj Butek Ján Spišiak Stanislava Milovská |
author_sort |
Juraj Butek |
title |
Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) |
title_short |
Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) |
title_full |
Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) |
title_fullStr |
Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) |
title_full_unstemmed |
Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians) |
title_sort |
garnet-vesuvianite equilibrium in rodingites from dobšiná (western carpathians) |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2021-02-01 |
description |
Intensively metasomatized rocks from serpentinized ultramafic tectonic fragments in Dobšiná, Western Carpathians, consist of typical rodingite mineral association: hydrated garnet, vesuvianite, diopside and clinochlore. Electron microprobe analysis (EMPA) and Micro-Raman analyses of the main minerals evidence complex mineralogical evolution and variable mineral chemistry. Garnet solid solution is dominated by grossular-andradite series, which demonstrates a significant degree of hydration, mainly for grossular rich garnet cores. Garnet is locally enriched in TiO<sub>2</sub> (up to 13 wt%), possibly indicating a chemical relic of a Ti-oxide mineral. Younger, andradite-richer garnet rims demonstrate a low degree of hydration, suggesting a harder incorporation of an (OH)<sup>−</sup> anion into its crystal structure. Garnet chemical variations display an ideal negative correlation between Al and (Fe<sup>3+</sup> + Ti). The most recent mineral phase is represented by euhedral vesuvianite (± chlorite), which crystallizes at the expense of the garnet solid solution. This reaction shows a well-equilibrated character and indicates a high extent of rodingitization process. Chlorite thermometry models suggest an average temperature of late rodingite (trans) formation of about 265 °C. |
topic |
rodingite hydrogrossular garnet vesuvianite micro-Raman spectra Dobšiná |
url |
https://www.mdpi.com/2075-163X/11/2/189 |
work_keys_str_mv |
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