Ultrapotassic dykes in the Moldanubian Zone and their significance for understanding of the post-collisional mantle dynamics during Variscan orogeny in the Bohemian Massif
Dyke swarm of ultrapotassic rocks occurs along border of Moldanubian Zone. Composition of dykes changes from mafic vaugnerite to syenite. The original magma was formed by minimum partial mantle melting. Syenite shows signature of fractionation and crustal assimilation.