PETROLOGY OF THE CROSSITE SCHIST FROM FRUSKA-GORA-MOUNTAINS (YUGOSLAVIA), RELIC OF A SUBDUCTED SLAB OF THE TETHYAN OCEANIC-CRUST

The mineral assemblage formed during the main stage of metamorphic rec rystallization in the crossite schist from the Fruska Gora Mts corresp onds to the epidote blueschist subfacies or high-T epidote-bearing seg ment of blueschist facies (P = 7-9 kbar and T = +/- 400 degrees C). Ge ochemical investigations indicate a primary alkaline character of the crossite schist, which suggests a volcanic are or mid ocean ridge basa lt tectonic setting. These rocks most probably represent a small relic of the former Mezozoic Tethyan oceanic crust, a discrete slice of maf ic rocks which was metamorphosed under subducting conditions in the Ea rly Cretaceous.