Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Skam bodies near Holšice, Moldanubicum, Bohemian Massif
Abstract
The Holšice regionally metamorphosed cpx-gar skarn occurs in the north of the Moldanubian zone. A few new skarn bodies were found out by detailed mapping in the vicinity, and three kinds of skarns were distinguished among them. The Holšice skarn consists of cpx-gar, and calc-silicate gneiss band (cm). Two generations of garnet have been distinguished. Older grossular-ric garnet equilibrate at 840°C, younger garnet under 650°C (gar-cpx geothermometer). Secondary mineral of the hisingerite-neotocite series is new for this locality. The second type of skarn, at the Zliv locality, is massive and contains magnetite (high anomalies in magnetometry) and no calc-silicate gneiss. Its gar-cpx, cpx, amph-gar and amph skarn types are poor in Al (hedenbergite, andradite, ferro-actinolite, grunerite). Grossular-almandine rich garnet from the andradite-hedenbergite assemblage yielded minimum pressure of 10 kbar. The third type of skarn occurs as a narrow contact zone (only 5cm wide) between marble and orthogneiss and contain sulphides, and spessartite-rich garnet.
