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Neoproterozoic lithosphere of the eastern Barents Sea provides a remarkable foundation for the Russian sector of this shelf, with its vast late Paleozoic-Mesozoic troughs and gas reservoirs. But, we are still struggling with the Uralide sutures and the tectonics of Novaya Zemlya, the northern appendage of the Urals and barrier to the Kara shelf and northern part of the West Siberian oil fields (Fig. 2). EUROPROBE neglected the Caledonides despite Peter’s contributions to the Uppsala Caledonide Symposium in 1981. By the mid 1980’s and EUROPROBE’s birth, we were agreed on the vast lateral displacements of the Caledonian nappes in the Scandes and East Greenland and the remarkable late- to post-orogenic collapse of the orogen that extended far out across the Atlantic continental margins, beneath Mesozoic basins. How these allochthons were emplaced, with outboard oceanic terranes transported eastwards in the Scandes at least 400 km, remained a mystery until we recently began to understand the importance of a hot “extruding” complex (Seve Nappes), sourced from along the outer edge of the underthrusting Baltica margin. The collision of Baltica with Laurentia appears now to provide a singularly well preserved middle to lower crustal analogue for the Himalayas. TIMPEBAR and subsequent work along the high Arctic margin of western Eurasia, and complementary studies of the Canadian, Alaskan and Russian sectors of the Arctic, are promoting new interpretations of the Phanerozoic orogens. These are stimulating reinterpretations of the Lomonosov, Mendeleev and Alpha ridges in the Arctic Basin, where recent seismic and potential field studies have helped to distinguish continental and ocean crust. As with climate science, there is an acute need to keep science clean of politics in these UNCLOS domains. REFERENCES Gee, D. G. and Stephenson, R. A. (eds) 2006: European Lithosphere Dynamics. Geological Society, London, Memoirs, 32. Figure 1. EUROPROBE projects (from Gee, D. G. and Stephenson, R. A. 2006) 3 3 Symposium 14: Deep Earth – From Crust to Core: A Tribute to Peter A. Ziegler
3 Symposium 14: Deep Earth – From Crust to Core: A Tribute to Peter A. Ziegler Figure 2. Tectonic elements of the western Eurasian Arctic in the Early Cenosoic, during initial opening of the Eurasian Basin and Norwegian-Greenland Sea. 1 .6 Evolution of continental structure from the Arching to the present: Views from the Canadian LITHOPROBE program Alan Green* *Institute of Geophysics, ETH, HPP O 5.1, Schafmattstrasse 30, CH-8093, Zurich Integrated multidisciplinary studies of geological targets on the Canadian landmass and adjacent continental margins have been LITHOPROBE's principal objectives since its initiation in 1984. The greatest effort has been directed towards an improved understanding of the structure and evolution of the key tectonic units that comprise the fundamental building blocks
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Abstract Volume 6 th Swiss Geoscien
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2 Plenary Session
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6 Plenary Session 3 Annual Opening
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