Abstract:

Grandidierite, kornerupine,and tourmaline occur in high grade pelitic gneisses from the Larsemann Hills,East Antarctica. The three minerals contact to each other and show a special order:Trn 1→Gdd→Trn 2→Krn→Trn 3,suggesting the occurrence of the assemblage is controlled by the temporal changes of the chemical potentials of B 2O 3 and H 2O.The discovery of the minerals is a good constraint on the setting and composition feature of metamorphism in the area.