Nawrocki, Jerzy; Panczyk, Magdelena; Williams, Ian
A range of mafic to intermediate extrusive and intrusive igneous rocks from the central part of King George Island were sampled for isotopic and palaeomagnetic studies. Single-grain U-Pb dating of zircon from basalts to trachytes from the upper part of the section gave Eocene ages (53.0 ± 0.7 to 47.8 ± 0.5 Ma), consistent with a whole-rock 40Ar-39Ar age of 52.7 ± 0.6 Ma. These ages correspond to the first stages of the opening of the Drake Passage. A Late Cretaceous 40Ar-39Ar age (75.4 ± 0.9...[Show more]
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