HR: 1340h
AN: T13D-1578    [Abstracts]
TI: U-Pb Zircon Provenance of Metasedimentary Basement of the Northwestern Terrane, Svalbard: A central East Greenland correlation
AU: * Petterssen, C
EM: calle@geo.su.se
AF: Dept. of Geology and Geochemistry, Stockholm University, Stockholm, SE-10691, Sweden
AU: Frei, D
AF: Geological Survey of Denmark and Greenland, Oster Voldgate 10, Copenhagen, DK-1350, Denmark
AU: Pease, V
AF: Dept. of Geology and Geochemistry, Stockholm University, Stockholm, SE-10691, Sweden
AB: Svalbard's Caledonian and older bedrock consists of three main exotic terranes separated by north-south trending strike-slip faults. Early in the 19-century Kulling (1930, 1934) noted the striking similarity between the Neoproterozoic and Early Paleozoic sedimentary rocks from East Greenland and Svalbard's Eastern Terrane. After this pioneering work Harland et al. (1969) documented their remarkable similarities through detailed stratigraphic correlation of Neoproterozoic and Early Paleozoic sedimentary rocks. Recent work in the Northwestern and the eastern part of the Eastern terrane shows that this metasedimentary basement has a strong resemblance to the Krummedal and Smallefjord sequences of central East Greenland, with Grenville age (sensu lato) granitoid intrusion followed by Caledonian migmatization and granite genesis. We present the first LA-ICP-MS U-Pb zircon provenance study on quartzites and mica schists from the Kongsfjorden Group of the Northwestern Terrane of Svalbard. These results indicate a strong correlation with the Krummedal of central East Greenland and help to constrain paleogeographic reconstructions of the Northwestern Terrane. References: Kulling, O. 1930. Stratigraphic studies of the geology of Northeast Greenland. Meddelelser on Gronland, 74, 317- 346. Kulling, O. 1934. Scientific results of the Swedish-Norwegian Arctic Expedition in the summer of 1931. Part XI, The "Hecla Hoek Formation" round Hinlopenstredet. Geografiska Annaler, 16, 161-254. Gee, D. G. and Tebenkov, A. M., 2004. Svalbard: a fragment of the Laurentian margin.? In: Gee, D. G. and Pease, V. (eds) The Neoproterozoic Timanide Orogen of eastern Baltica. Geological Society, London, Memoirs, 30, 191- 206. Harland, W. B. 1969. Contribution of Spitsbergen to understanding of tectonic evolution of North Atlantic region. North Atlantic Geology and Continental Drift. Memoirs of the American Association of Petroleum Geologists, 12, 817-851.
DE: 8100 TECTONOPHYSICS
DE: 8104 Continental margins: convergent
DE: 8106 Continental margins: transform
DE: 8110 Continental tectonics: general (0905)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting