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Madison: University of Wisconsin Press. ceous and Paleogene units on Seymour Island, northern Antarctic Geological fieldwork 62W on Deception Island DRAKE and King George Island, PASSAGE South Shetland Islands King George lid T2 _ RANDALL A. KELLER Lions College of Oceanography 50 km Oregon State University Corvallis, Oregon 97331 V VL AV 63S 2ep.,ion On 6 January 1991, the Fourth Polish Geodynamical Expedi- iEEL occI::t::3 tion to West Antarctica departed Montevideo, Uruguay aboard the ocean-going tug Neptunia (Polish Ship Salvage Company, Geography and bathymetry of the Bransfield Strait region. Land Gdynia). By kind invitation of Aleksander Guterch (Institute of areas are shaded. Bathymetry contoured in kilometers (km). Lo- Geophysics, Polish Academy of Sciences, Warsaw) and Krzysz- cations of 1990-1991 geological fieldwork described in this article tof Birkenmajer (Institute of Geological Sciences, Polish Acad- are Deception Island and Lions Rump on King George Island. emy of Sciences, KrakOw), I was able to participate in that expedition. The expedition spent 6 weeks in the Bransfield Strait and South Shetland Islands conducting geophysical surveys and This work was supported by a Fulbright Research Fellowship geological fieldwork at various locations. I was a member of a from the U.S. Information Agency, and National Science Foun- geological field party that spent 17 days on Deception Island, dation grant DPP 88-17126 to M.R. Fisk. a large volcano in the Bransfield Strait (figure). All of Deception Island is thought to be less than 700,000 years old, and many areas are still warm from volcanic eruptions as recent as 1970 (Smellie 1988). Professor Birkenmajer mapped the geology of References the island while I collected samples of volcanic rocks for geo- Birkenmajer, K., E. Soliani, Jr., and K. Kawashita. 1989. Geochronology chemical and petrological analyses (see Keller, Fisk, and White, of Tertiary glaciations on King George Island, West Antarctica. Bul- Antarctic Journal, this issue). letin of the Polish Academy of Sciences, Earth Sciences, 37, 27-48. Our field party then moved to the area of Lions Rump on Keller, R.A., M.R. Fisk, and W.M. White. 1991. Geochemistry of Qua- King George Island (figure) for 14 days. This area contains ternary volcanism in the Bransfield Strait and South Shetland Is- exposures of glacial sediments interbedded with volcanic arc lands: Preliminary results. Antarctic Journal of the U.S., 26(5). rocks of Tertiary age and has been the subject of intense geo- Porebski, S.J., and R. Gradzinski. 1987 Depositional history of the logical study (e.g., Porebski and Gradzinski 1987; Birkenmajer, Polonez Cove Formation (Oligocene), King George Island, West Ant- Soliani, and Kawashita 1989). I sampled some of the volcanic arctica: A record of continental glaciation, shallow-marine sedimen- tation and contemporaneous volcanism. Studia Geologica Polonica, arc rocks for geochemical analyses and comparison to our sam- 93(7), 7-62. ples from the younger volcanoes (such as Deception Island) Smellie, J.L. 1988, Recent observations on the volcanic history of De- associated with extension in the Bransfield Strait (see Keller, ception Island, South Shetland Islands. British Antarctic Survey Bulle- Fisk, and White, Antarctic Journal, this issue). tin, 81, 83-85. 46 ANTARCTIC JOURNAL.