Dumortierite and tourmaline from abyssal pegmatites at Vémyslice near Moravský Krumlov, Gföhl unit, Moldanubicum

Article PDF
Acta Mus. Moraviae, Sci. Geol. 89 (2004), issue 1–2, pages 45–54
Article
Authors:
Abstract:

Dumortierite and tourmaline from abyssal pegmatites at Vémyslice near Moravský Krumlov, Gföhl unit, Moldanubicum

Abyssal pegmatites with dumortierite and tourmaline cut biotite-sillimanite gneiss at Vémyslice near Moravský Krumlov, Gföhl Unit. Pegmatites are highly peraluminous, characterized by presence of dumortierite and sillimanite, and tourmaline and andalusite, respectively. Dumortierite is enriched in As – 0.22 apfu and Ti – 0.20 apfu. Tourmaline of a schorl-oxy-schorl-foitite-dravite solid solution shows high Al in the T-site. The primary assemblage K-feldspar+andalusite in tourmaline-bearing pegmatite suggests low pressure about 3 kbar or less and temperature about 600°C; dumortierite-bearing pegmatite formed at higher temperature and/or pressure. Absence of primary muscovite differs the abyssal pegmatites at Vémyslice from similar abyssal pegmatites with dumortierite, olenite, schorl, sillimanite, kyanite and primary muscovite of the Kutná Hora region.

Contact:

Jan Cempírek, Milan Novák, Institute of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic, e-mail: cempirek@sci.muni.cz

Citation:
Cempírek, J., Novák, M., 2004: Dumortierit a turmalín z abysálních pegmatitů od Vémyslic u Moravského Krumlova, gföhlská jednotka, moldanubikum. – Acta Mus. Morav., Sci. Geol., 89, 1–2, 45–54 (with English summary)
ISSN: 1211–8796