| Institution: | 1.Faculty of Geology,St. Petersburg State University,St. Petersburg,Russia;2.Diamond and Precious Metal Geology Institute,Siberian Branch of the Russian Academy of Sciences,Yakutsk,Russia;3.Karpinsky All-Russia Geological Research Institute,St. Petersburg,Russia;4.Centre for Earth Evolution and Dynamics, CEED, Department of Geosciences,University of Oslo,Oslo,Norway |
| Abstract: | We have studied pebbles of igneous rocks from the Lower Jurassic sedimentary succession of Hall Island, Franz Josef Land. Pebbles are represented by felsic intrusive and extrusive rocks, often cataclased and greisenized. The U–Pb age of crystallization for zircons of the studied samples yielded the Latest Devonian–Early Carboniferous and Early–Middle Permian ages. In addition, the studied zircons demonstrate a broad scatter of ages, from Middle Paleozoic to Mesozoic, suggesting repeated thermal reworking and metamorphism of granites. It is shown that coeval Late Paleozoic magmatism indicates the similarity of the geological evolution of the northern Barents Sea and the Severnaya Zemlya archipelago. |
