Bulletin Mineralogie Petrologie

Houzar Stanislav, Cempírek Jan, Toman Jiří, Hrazdil Vladimír, Filip Jan, Radoň Miroslav

Volume 22, issue 1 (2014), pages 15-24

dravite, trivalent iron, chemical composition, evolution, tourmalinite, Oparno Crystalline Complex, Northern Bohemia

Tourmalinite occurrences at Kalvárie hill near Velké Žernoseky (northern Bohemia, Czech Republic) are represented by massive tourmaline-rich layers (with minor quartz <10 vol.%) in biotite-muscovite metapelites (phyllite to schist). Two tourmalinite assemblages were identified: a) almost monomineral tourmalinites to quartz–tourmaline rocks with accessory biotite, chlorite, fluorapatite, muscovite, calcite, and K-feldspar; b) tourmaline-epidote-quartz tourmalinites with minor garnet, muscovite and chlorite, and rare titanite, epidote and zircon. Garnet from the contact of the latter assemblage with the host rock (schist) exhibits an inverse zoning of Fe and Mn (Mn-rich core, Fe-rich rims). Four textural and compositional types of tourmaline containing variable contents of Fe³⁺, Fe²⁺, Ti, Ca, Na, and F were found. Other tourmalinite occurrences in the Oparno Crystalline Complex (Oparno-Černodolský mlýn, Chotiměř) are characterized by increased amount of quartz, and typically form tourmaline-quartz veins in muscovite-biotite gneisses. Compared to the occurrence at Kalvárie hill, the tourmaline from Oparno has higher Mg, Al, and Ca contents and lower amounts of Na and OH. All rocks most likely formed by metamorphic overprint of boron-bearing protolite (biotite-muscovite metapelite with basic admixture), however, a source of boron remain ambiguous.

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