Abstract

Rubidium-strontium ages from two localities in the Transantarctic Mountains indicate that granitic rocks formed about 490 m.y. ago. Discordant ages and cataclastic texture in the specimen from the Queen Maud Range suggest younger early Paleozoic metamorphism of that granite. A single determination on biotite from a quartz diorite gneiss on Thurston Island yields a minimum age of 280 m.y.

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