THE TICAU HILLS (NW TRANSYLVANIA, ROMANIA) - LITHOSTRATIGRAPHY AND PETROLOGY OF THE METAMORPHIC ROCKS

Ticau Hills represent one of the crystalline islands of NW Transylvani a, in which the pre-Variscan basement of the Tisia Domain outcrops. A lithostratigraphic sequence is described consisting of a lower, Magmat ogene Stejera-Cheud Member with five subunits and an upper, Terrigenou se Chelinta Member, with three marker horizons. Three metamorphic phas es were recognized: the first (main) phase developed progressively the second, retrogressively and the final, progressively. Probably these metamorphic phases were related to the Caledonian and the Hercynian ev ents. Late alterations are due to hydrothermal activity and intensive Paleogene weathering phenomena.