Abstract
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.
Highlights
Received: 7 December 2020Rodingite represents a particular calcium-rich metasomatic rock
We report an equilibrated crystallization of vesuvianite at the expense of a complex garnet solid solution in rodingite from Dobšiná, Western Carpathians
Thin section observations showed that rodingites are characterized by an irregular distribution of the main mineral phases, which include garnet, vesuvianite, clinopyroxene and chlorite (Figure 2)
Summary
Rodingite represents a particular calcium-rich metasomatic rock. Its formation is closely related to the serpentinization process of ultramafic rocks since the origin of the metasomatic fluid is generally regarded as a product of serpentinization [1,2,3,4,5,6]. These rocks are characterized by a heterogeneous and quite complex mineralogy, mostly dominated by. Ca-rich often hydrated silicate minerals: garnet, vesuvianite, diopside, chlorite, epidote, zoisite, tremolite, prehnite and others [7,8,9,10,11].
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