Abstract
This paper presents six KAr whole-rock ages of the Znosko Glacier Formation (Cardozo Cove Group) that crops out between Mackellar Inlet (type-area) and Ezcurra Inlet, inner Admiralty Bay, King George Island, Antarctica. Originally attributed to the Upper Mesozoic, a RbSr isochron diagram place the lithostratigraphic unit in the Paleocene (60±5 Ma). The same samples were isotopically analyzed by the KAr method and the calculated ages, which range between 40 and 50 Ma, confirm the effect of an important tectonic-thermal event, responsible for structural deformations and metasomatic alterations in that unit. We discuss the origin of the tectonic event and the related KAr reset on rocks cropping out around Admiralty Bay.
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