Publication details
Vzácnoprvkové pegmatity v JV časti strážeckého moldanubika
| Title in English | Rare-element pegmatites in SE part of the Strážek Moldanubicum |
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| Authors | |
| Year of publication | 2017 |
| Type | Conference abstract |
| Citation | |
| Description | Rare-element pegmatites (with elevated contents of Li, Sn, Ta, and W) were studied at four localities near Velká Bíteš: Osová Bítýška, Vlkov, Křižínkov and Křoví. The studied pegmatites are situated in the easternmost part of the Moldanubian zone. During the field part of the study, representative samples were collected and the localities were mapped. The laboratory part was devoted to the assessment of their mineralogy, chemical composition of accessory minerals and tourmaline using an electron microprobe (EMPA). Pegmatite at Osová Bítýška has Li mineralization (lepidolite, tourmaline) and high contents of F, Rb, Cs and elevated Sn (lepidolite, topaz, tourmaline, phosphates). Pegmatite of Vlkov is chemically primitive, it contains elevated Nb (oxides) and F (tourmaline). The pegmatite Křižínkov 2 is relatively primitive, deformed, and contains elevated REE and Zr (monazite, zircon, xenotime, cheralite) and increased contents of Nb and F (columbite, tourmaline). The Li-pegmatite at Křižínkov is well fractionated, contains elevated Li, F, Sn, and W (tourmaline – elbaite, cassiterite, wodginite, ixiolite); similar degree of fractionation is in the adjacent pegmatite at Křoví. All studied pegmatites have tourmalines with high contents of Fe and F and very low contents of Mg, indicating their increased fractionation. |