Rb-Sr whole-rock ages of metamorphic rocks from eastern Queen Maud Land, East Antarctica

Rb-Sr whole-rock isochron ages were determined on the Lutzow-Holm and Yamato-Belgica Complexes from eastern Queen Maud Land. Metamorphic rocks from East Ongul Island, Nesoya, Sinnan Rocks and the Yamato Mountains gave ages ranging between 683.0 and 722.1Ma. Rocks from Skarvsnes gave older ages of 1131 and 1033Ma. All these ages are interpreted to represent the times of high-grade metamorphism. The Skarvsnes area was apparently not affected by the 700Ma metamorphism. The initial ^Sr/^Sr ratios of metamorphic rocks show a considerable variation on local as well as regional scale. The higher initial ratios of the Yamato Mountains suggest that the protolith of the Yamato-Belgica Complex is older than that of the Lutzow-Holm Complex