Electron microprobe analysis of tourmaline grains, Mecsek Mountains, Hungary

Some outcrops of Bakonya Member of Kővágószőlős Sandstone Formation (detrital complex of the Upper Permian of Mecsek) contains a considerable amount of tourmaline. Optically these grains can be divided into different groups. In addition to different genesis of grains some of them has syntaxial rim. It is well known that tourmaline is an excellent indicator of rock types. The result of microprobe investigations of tourmaline grains were plotted on the diagrams of HENRY and GUIDOTTI (1985). The differences in composition of cores correspond to different metamorphic rocks. The grains after getting into Permian sedimentary basin had overgrown diagenetically, due to the new geochemical conditions