Textural and compositional evidence for a polyphase saturation of tourmaline in granitic rocks from the Třebíč Pluton (Bohemian Massif)

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Authors

BURIÁNEK David DOLNÍČEK Zdeněk NOVÁK Milan

Year of publication 2016
Type Article in Periodical
Magazine / Source Journal of Geosciences
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.3190/jgeosci.220
Field Geology and mineralogy
Keywords tourmaline; chemical composition; granite; pegmatite; magma evolution; fluid inclusions
Attached files
Description Crystallization of granite melts produced several textural types of granites and pegmatites in the Třebíč Pluton: dykes of volumetrically dominant muscovite–biotite granite, minor tourmaline granite and veins of tourmaline pegmatite. Evidence for polyphase saturation of tourmaline was observed including the following textural and compositional types of tourmaline: (i) nodules surrounded by leucocratic halos; (ii) euhedral to subhedral grains randomly distributed within tourmaline granite and tourmaline–quartz accumulations with leucocratic halos in the marginal part of granite dykes; (iii) rare columnar crystals of black tourmaline occurring locally in central parts of pegmatite; (iv) dravite-rich rims and late dravite veinlets in tourmaline grains from nodules, suggesting crystallization from hydrothermal fluids.
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