Article Dans Une Revue Minerals Année : 2021

Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)

Résumé

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 TiO2 (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)− anion into its crystal structure. Garnet chemical variations display an ideal negative correlation between Al and (Fe3+ + 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.
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hal-04844043 , version 1 (17-12-2024)

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Juraj Butek, Ján Spišiak, Stanislava Milovská. Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians). Minerals, 2021, 11 (2), pp.189. ⟨10.3390/min11020189⟩. ⟨hal-04844043⟩
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