Acta Musei Moraviae

Granitic NYF pegmatites in the Velké Meziříčí region, Třebíč Pluton, western Moravia (Czech Republic)

Detailed field work on NYF granitic pegmatites (Kfs + Plg + Qz + Ab + Bt) enclosed in syenite (to melagranite) of the Třebíč Pluton within the area of Velké Meziříčí revealed existence of several distinct subregions of granitic pegmatites – Velké Meziříčí, Vlčatín, and Uhřínov. The pegmatites from the individual sub-regions differ in their geological position, shape and size of pegmatite bodies, their internal structure (zoning, abundance of pockets), and mineral assemblages. Titanite is along with allanite-(Ce) the most typical accessory mineral present in several textural and paragenetic types within a single pegmatite body in whole region. The pegmatites in the Velké Meziříčí region differs from the NYF pegmatites enclosed in the Třebíč Pluton from the Třebíč-Vladislav region in (i) simple internal structure and size of pegmatite bodies, (ii) abundance of pockets and (iii) rather primitive mineralogy with only rare Y,REE,Nb,Ta,Ti-oxide minerals and tourmaline, and total absence of Be-bearing (e.g., beryl, phenacite, bavenite) and Sn-bearing (e.g., cassiterite, herzenbergite) minerals locally common in the Třebíč-Vladislav region.