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Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Hydrothermal veins with tourmaline related to eastern marginal fault Boskovice furrow

David Buriánek

Geoscience Research Reports 44, 2011 (GRR for 2010), pages 141–145

Keywords: Brno massif, Boskovice Furrow, hydrothermal veins, chemical composition tourmaline

Map sheets: Ivančice (24-34)

Full text (PDF, 0.3 MB)

Abstract

Small hydrothermal veins (tourmaline + K-feldspar ± albite ± rutile ± titanite) are spatially related to NNE-SSW orientated shear zone, which represents tectonic boundary between Brno massif and Boskovice furrow (eastern marginal fault Boskovice furrow). Hydrothermal veins, up to 7 mm thick are oriented perpendicular to foliation surrounding mylonites and are Autunian or younger according geological position. The chemical composition tourmaline (Al = 5.68-6.28; Na = 0.56-0.65; Ca = 0.14-0.21 apfu; XFe = 0.38-0.45) is slightly different from composition Fe-rich dravite in hydrothermal veins abundant in metadiorite subzone Brno massif (quartz + tourmaline ± rutile ± chalcopyrite ± calcite).