Bulletin Mineralogie Petrologie

Ružička Peter, Myšľan Pavol, Števko Martin, Kurylo Sergii

Ročník 29, číslo 1 (2021), strana 16-26

DOI: https://doi.org/10.46861/bmp.29.016

atoll garnets, basalt metapyroclastics, Čučma, Slovak Republic

Atoll garnets in basalt metapyroclastics from the locality Čučma - Vincent (Slovak Republic) consist of relict cores and zonal rings. Research was focused on comparison of chemical changes in these garnet microstructures. Relict cores have composition Sps_41.4-45.2Grs_40.6-43.0Adr_6.4-13.6 Alm_1.9-6.1, inner BSE light zone in the rings has composition Grs_38.2-44.9Sps_39.6-43.7Alm_6.3-12.4 Adr_6.5-9.6 and outer BSE dark zone in the rings has composition Sps_34.3-40.3Grs_33.3-38.3Adr_8.5-17.3  Alm_12.7-17.1. The highest content of Mn²⁺ in the atoll garnets was observed in the relict cores (1.21 - 1.33 apfu) and subsequent decreasing trend in contents of Mn²⁺ from the inner parts of the rings (BSE dark zone; 1.16 - 1.29 apfu) to their edge (BSE light zone; 1.02 -1.20 apfu) is present. The opposite trend was observed for Fe²⁺ content. Inner parts of the garnets are replaced by actinolite and calcite with slightly higher content of Mn (Act up to 0.07 apfu; Cal up to 0.02 apfu). Matrix of basalt metapyroclastics was primarily formed by hedenbergite which was later replaced by actinolite.

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