Kraus, Stefan; del Valle, Rodolfo (2008): Geological map of Potter Peninsula (King George Island, South Shetland Islands, Antarctic Peninsula). Instituto Antártico Chileno, Punta Arenas, Chile & Instituto Antártico Argentino, Buenos Aires, Argentina, doi:10.1594/PANGAEA.667386
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We present here a new geological map of Potter Peninsula (King George Island, South Shetland Islands). Like on adjacent Barton Peninsula, the morphology on Potter Peninsula is predominantly characterized by a glacial landscape with abrasion platforms offshore, in parts steep cliffs along the coast, and a rather smooth, hilly countryside in the interior. Potter Peninsula forms part of the downthrown Warszawa Block. The volcanic sequence cropping out here belongs to the King George Island Supergroup, with an observed local minimum thickness of approx. 90 m (Kraus 2005). The most prominent morphological feature is Three Brothers Hill (196 m), a well known andesitic plug showing conspicuous columnar jointing. It marks the final stage of activity of a Paleogene volcano, whose eruption products (lava flows and pyroclastic rocks), together with hypabyssal intrusions related to the volcanism, make up most of the lithology observed on Potter Peninsula (Kraus 2005).
The Three Brothers Hill volcanic complex is eroded down to its deepest levels. Thus, the stratigraphically deepest units from the initial phase of volcanic activity are cropping out in some parts (Kraus & del Valle, in Wienke et al. 2008). The lithology on Potter Peninsula comprises lava flows (~50%), pyroclastic rocks (ash-fallout, pyroclastic flow deposits, volcanic breccia and agglomerates, ~30%) and hypabyssal intrusions (dykes, sills and small subvolcanic intrusive bodies, ~20%). 40Ar/39Ar datings carried out on magmatic dykes from Potter Peninsula indicate a short, but intense intrusive event during the Lutetian (Kraus et al. 2007).
Kraus, Stefan (2005): Magmatic dyke systems of the South Shetland Islands volcanic arc (West Antarctica): reflections of the geodynamic history. PhD Thesis, LMU München: Fakultät für Geowissenschaften, 160 pp, urn:nbn:de:bvb:19-38277
Kraus, Stefan; McWilliams, Michael; Pecskay, Zoltan (2007): New 40Ar/39Ar and K/Ar ages of dikes in the South Shetland Islands (Antarctic Peninsula). In: Cooper A.K. & Raymond C.R. (eds.): Antarctica: A Keystone in a Changing World Online Proceedings of the 10th ISAES, U.S. Geological Survey, Open-File Report 2007-1047, Short Research Paper, 035, 3, doi:10.3133/of2007-1047.srp035
Wiencke, Christian; Ferreyra, Gustavo A; Abele, Doris; Marenssi, Sergio (2008): The Antarctic ecosystem of Potter Cove, King-George Island (Isla 25 de Mayo): Synopsis of research performed 1999-2006 at the Dallmann Laboratory and Jubany Station. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 571, 411 pp, doi:10.2312/BzPM_0571_2008