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Equilibrium conditions of minerals in Al-Mg-rich eclogite from Světlík (Moldanubian Zone)
 Tecl, Martin ; Faryad, Shah Wali (advisor) ; Racek, Martin (referee)
English abstrakt This thesis focusses on textural relations of Al-Mg-rich kyanite eclogite from Světlík-Suš locality in the monotonous group of the Moldanubian Zone. Mineral analyses and compositional maps were used to analyze detail relations and reactions responsible for mineral formation and/or their decomposition. The analyzed minerals were then compared with the chemical composition of minerals from other eclogites and garnet pyroxenites from studied locality. Based on bulk rock chemistry and mineral analyses, the studied kyanite eclogite is comparable rather with garnet pyroxenite. Minerals stable under eclogite facies conditions in the rock were garnet, jadeite rich clinopyroxene, Cr-kyanite and Ce-rich clinozoisite/zoisite, which is transformed to tabular pseudomorphosis. The rock shows clear evidence of granulite facies overprint. In total 9 types of symplectites were distinguished. Most of them were created under granulite facies condition. Compositional maps obtained for the Cr-rich kyanites show diffusion of Cr from kyanite to garnet during the granulite facies conditions. Symplectites with clinopyroxene and orthopyroxene were transformed into amphiboles during the decompression to amphibolite facies conditions. Keywords: eclogite, microscopy, mineral chemistry
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4 Tecl, Michal
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