Bulletin Mineralogie Petrologie

Ružička Peter, Myšľan Pavol, Števko Martin, Kurylo Sergii

Ročník 29, číslo 1 (2021), strana 49-58

DOI: https://doi.org/10.46861/bmp.29.049

Ti-andradite, Ca-skarn, Magnet hill, Tisovec, Slovak Republic

Analyzed garnets from the Magnet hill area near Tisovec (Slovak Republic) are part of a Ca-skarn mineral association consisting of diopside, clinochlore and calcite. Compositionally they correspond to Ti-rich andradite (Adr_50.9-73.7) with minor grossular (Grs_3.8-44.5) and schorlomite (Sch_0.5-41.5) components. Garnets contain up to 13 wt. % TiO₂ and in all of them ^YFe³⁺>^YTi ratio prevails. Both sector and oscillatory chemical zoning were observed, which is primarily caused by variable distribution of Ti contents within individual garnet crystals. The three principal zones were distinguished in BSE imaging. The brightest are Ti-enriched zones with Ti content ranging from 0.85 to 0.50 apfu. Titanium gradually decreases in transitional zone (0.17 - 0.40 apfu) and reaches the minimum values in the dark zones (0.01 - 0.13 apfu). In the Ti-enriched zones the content of Si⁴⁺ and Al³⁺ is decreased due to substitution of Ti⁴⁺ and Fe³⁺ and assumed hydrogarnet substitution (SiO₄)^4- ↔ (O₄H₄)^4-.

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