Amphibolites in the Vicinity of the Nové Město na Moravě (NE Part of the Moldanubian Zone, Bohemian Massif) – the Evidence of Older Granulite Facies Metamorphism

its border with Svratka Crystalline Unit, is characteristic by occurrence of the variously migmatized biotite ± silimanite para-gneisses, leucocratic biotite ± muscovite migmatites, including smaller, usually elongated bodies of the metamorphic mafic rocks, representing garnet-free or garnet ± clinopyroxene am-phibolites to granulites, both locally banded, and rocks having (showing) features corresponding rather to garnet-rich restite. Except mentioned rocks, smaller bodies of ultramafic rocks such as serpentinites and pyroxenites also occur. The mineral paragenesis typical for studied samples of am-phibolites includes assemblage of the greenish to green-brown-ish pargasitic amphibole and plagioclase with An29–85, which is sometimes complemented by preserved assemblage of garnet and clinopyroxene, corresponding to higher metamorphic grade, represented by transition between at least upper amphibolite and granulite facies. Garnets are predominantly of an alman-dine-grossular composition (Alm40–60, Gro24–35, Pyr12–31, Spe1–5) and often show inclusions of small grains of bluish clinopyrox-ene (up to ca 20 % of Jd component), rutile, ilmenite and apatite. Other, not so common accesoric minerals are zircon, sphene, minerals of epidote group and quartz. Anhedral chlorite and biotite are rare retrograde phases in garnet-free amphibolites, while symplectites of green amphibole and plagioclase forming diablastic textures around garnet are typical for garnet amphibo-lites. Comparing basicity of plagioclases, inside symplectites is higher than outside (less than An50) and is increasing towards the garnet, as a result of reactions producing An-rich plagioclas