Journal of

GEOsciences

  (Formerly Journal of the Czech Geological Society)

Original Paper

Pavel Povondra, Stanislav Vrána

Tourmaline and associated minerals in alkali-feldspar orthogneiss near Hluboká nad Vltavou, southern Bohemia

Journal of the Czech Geological Society, volume 41 (1996), issue 3-4, 191 - 200


  Abstract

Tourmaline in the Hluboká orthogneiss, a rock unit 7 by 2 km in outcrop size, is characterized by wet chemical analyses of four samples, microprobe analyses, unit-cell dimensions, density, and indices of refraction.The tourmaline composition range from sc49-dr36-ol15 to sc78-dr11-ol11; the content of the olenite end-member ranges up to 26 %. The associated major and accessory minerals are also characterized by microprobe analyses. The data obtained are compatible with primary magmatic crystallization of tourmaline in the pre-Variscan parent rock. A comparison of tourmaline composition in five related orthogneiss and granite-metagranite bodies in the Moldanubian Zone of south-central and eastern Bohemia shows significant similarities, except the Radonice orthogneiss, carrying a notably more magnesian tourmaline.

Journal of Geosciences, Published by © Czech Geological Society, with support from the Czech Geological Survey.
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Policy: Open Access

ISSN: 1802-6222

E-ISSN: 1803-1943