MRAMORY V METADIORITOVÉ SUBZÓNĚ BRNĚNSKÉHO MASIVU

David Buriánek

Abstrakt

Several dolomitic marble lenses were found at the western margin of the metadiorite subzone in the central basic belt of the Brno Massif. Phase relations and mineral compositions indicate two metamorphic events in surrounding amphibolites. Thermometric estimations indicate metamorphic conditions of early metamorphism in epidote amphibolite facies conditions (for 6 kbar T = 650 - 690 °C) and later in greenschist facies conditions. Mineral assemblages in marbles: Tr + Cal ± Chl ± Qtz and Tr + Dol ± Chl indicate metamorphism only in greenschist facies. Tremolite formed throuhg metasomatic reactions of SiO2-rich hydrothermal fluids with dolomite in centre of marbles boudins. This process is related to tectonic deformation of pure dolomitic marbles during metamorphism in greenschist facies.

Bibliografická citace

Buriánek, D. (2016). MRAMORY V METADIORITOVÉ SUBZÓNĚ BRNĚNSKÉHO MASIVU. Geologické výzkumy na Moravě a ve Slezsku, 8. Získáno z https://journals.muni.cz/gvms/article/view/5057

Klíčová slova

BrnoMassif; marbles; amphibolites; metasomatic reactions

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Reference

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Buriánek, D. - Melichar, R. (1999): Mramory uzavřené v amfibolitech brněnského masivu u Želešic. - Geol. výzk. Mor. Slez. v r. 1998, 4 , 105-106. Brno.

Hanžl, P. - Melichar, R. (1997): The Brno massif: a section through the active continental margin or a composed terrane?.- Krystalinikum, 23, 33-58. Brno.

Hey, M.H. (1954): A new review of the chlorites. - Mineral Mag. 30, 277-292.

Holland, T. J. B. - Blundy, J. D. (1994): Non-ideal interactions in calcic amphiboles and their bearing on amphibole plagioclase thermometry. - Contributions to Mineralogy and Petrology, 116, 433-447.

Leake, B. E. et al. (1997): Nomenclature of amphiboles: report of the Subcommittee on amphiboles of the International Mineralogical Association Commission on New Minerals and Mineral Names.- Eur. J. Mineral.,6, 623-651.

Schumacher, J. (1996): The estimation of the proportion of ferric iron in tht electron-microprobe analysis of amphiboles.- Can. Mineral. 34, 238-246.