Pańczyk, Magdalena; Nawrocki, Jerzy; Williams, Ian S.
The Blue Dyke and Jardine Peak are subvertical hypabyssal intrusions cutting a
stratiform volcanic sequence in the Admiralty Bay area on King George Island (South
Shetlands, Antarctica). The rocks are porphyritic, crystal−rich basaltic andesites. Tiny zir−
con crystals were used for single grain SHRIMP U−Pb dating. The mean ages calculated for
the zircon populations from both intrusions indicates Late Oligocene (Chattian) formations.
Zircon grains from the Blue Dyke gave the mean age of...[Show more]
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