Mineralogie lepidolitového pegmatitu Lhenice I
| Title in English | Mineralogy of the lepidolite-subtype pegmatite Lhenice I |
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| Authors | |
| Year of publication | 2019 |
| Type | Article in Periodical (without peer review) |
| MU Faculty or unit | |
| Citation | |
| Description | The Lhenice pegmatite lies in the southern part of the moldanubian zone and it is a member of the South-Bohemian pegmatite field that includes pegmatites Lhenice II, Nová Ves and Chvalovice I and II (Novák & Cempírek, 2010). The locality is characterised by presence of high-grade metamorphic rocks. Based on the available mineral samples, the pegmatite was determined as a rare-element LCT pegmatite enriched in volatile elements like Li, P, F, Nb, Ta, Cs, Rb, Sn. The pemgatite is divided into 5 textural zones: graphic, granitic, blocky, Qtz-Ms-Ab and Ab-Lpd. In the each zone, three generations of tourmaline are found: primary, recrystallized and metasomatic. Towards the pegmatite core, contents of Na, F and Li increase. Tourmaline with higher contets of Na and F is typically metasomatic. Recently, a significant proportion of oxy-tourmalines was found in all pegmatite zones. Micas are abundant in all pegmatite, muscovite overgrown by two generations of lepidolite is typical in the Qtz-Ms-Ab zone. Columbite is present in four generations with variable amount of tantalite component. All generations are manganocolumbite, only one grain in cassiterite is manganotantalite. Cassiterite occurs in two generations: primary and recrystallized. |
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