Granitoids of the Mauthausen type in the Czech part of the Moldanubian Batholith

Abstract

The Modanubian (or South Bohemian batholith) is the largest Variscan magmatic complex in the Bohemian Massif, which is part of the Central European Hercynian belt. In northern part of the Moldanubian batholith occur relatively small bodies of granitoids which could be correlated with biotite granodiorites of the Mauthausen type which occur in the Austrian part of this batholithic complex. The first body is formed by biotite-muscovite granite of the Pavlov type. The second occurrence of granitoids of the Mauthausen type is formed by two, relatively small bodies of the biotite granodiorites of the Pohled type. The granites of the Pavlov type contain quartz, K-feldspar, plagioclase (An22-37), biotite (annite) and muscovite. This granite is slightly peraluminous (A/CNK 1.15–1.22). The biotite granodiorites of the Pohled type contain quartz, plagioclase (An16-45), K-feldspar and biotite (annite). This granodiorite is also slightly peraluminous(A/CNK 1.05– 1.15).