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Geology of Volcanic Rocks (?Upper Cretaceous-Lower Tertiary) at Potter Peninsula, King George Island (South Shetland Islands, West Antarctica.

Birkenmajer K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

1998

Vol. 46, nr 2

147-155

Stratiform basaltic/basaltic-andesite lavas (a minimum 50m thick), with red agglomerate and tuff interlayers (up to 10m thick), are the oldest rocks recognized at Potter Peninsula, King George Island (South Shetland Islands, West Antarctica). They resemble volcanic-volcaniclastic rocks of the Paradise Cove Group (King George Island Supergroup) from Admiralty Bay, King George Island, K-Ar-dated at Upper Cretaceous. Hypabyssal intrusions of basalt and andesite at Potter Peninsula represent two hases: (1) plugs and stills at Stranger Point are closely interrelated with the stratiform volcanic complex, and could be of Cretaceous age; (2) a large basalt (resp. hypersthene-augite andesite) plug of Three Brothers Hill, K-Ar-dated at Lower Tertiary, and two systems of vertical basaltic/andesitic dykes (Admiralty Bay Gp), cut the stratiform volcanic complex. The older dykes strike NW-SE. The younger dykes, striking NNE-SSW to N-S, often follow vertical Tertiary faults transversal to the island axis. These transversal faults cut also the Three Brothers Hill plug.