硅硼镁铝矿－柱晶石－电气石组合在南极的发现

OCCURRENCE OF THE ASSEMBLAGE GRANDIDIERITE, KORNERUPINE,AND TOURMALINE IN ANTARCTICA

硅硼镁铝矿、柱晶石和电气石组合产于东南极拉斯曼丘陵，三种矿物相互接触并表现出特定的顺序：电气石（Ｔｒｎ１）→硅硼镁铝矿→电气石（Ｔｒｎ２）→柱晶石→电气石（Ｔｒｎ３），表明其产出是受Ｂ２Ｏ３、Ｈ２Ｏ活度的时间演化而不是空间变化所控制。

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.