K-Ar whole-rock ages ranging from 78 to 88 m.y. have been determined from four samples of quartz-calcite-amphibole schist obtained from Elephant Island in the South Shetland Island group on the southern limb of the Scotia Arc. The lithology and structural history of the rocks forming Elephant Island indicate that they are part of the pre–Late Jurassic, and probably Paleozoic, metamorphic rocks of the region. The ages are likely to reflect a regional thermal event in the Antarctandes during the late Mesozoic–early Cenozoic Andean orogeny.

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