First paleomagnetic data for the New Siberian Islands: Implications for Arctic paleogeography |
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| Institution: | 1. Novosibirsk State University, 2, Pirogova st., Novosibirsk 630090, Russia;2. A.A. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, 3, prosp. ak. Koptyuga, Novosibirsk 630090, Russia;3. A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Sredny pr. 74, St. Petersburg 199106, Russia;4. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS), Australia;5. The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;6. School of Earth and Environment, University of Western Australia, Crawley, WA 6009, Australia;1. Instituto Geológico y Minero de España (IGME), c/ Ríos Rosas, 23, 28003 Madrid, Spain;2. Departamento de Geodinámica, Universidad de Granada, Granada, Spain;3. Instituto Andaluz de Ciencias de la Tierra, CSIC and Universidad de Granada, Armilla, Granada, Spain;4. Dipartimento di Geoscienze, Universitá di Padova, Padova, Italy;1. CAS Key Laboratory of Crust–Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China;2. Centre for Tectonics, Resources and Exploration, Department of Earth Sciences, University of Adelaide, SA 5005, Australia;3. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083, China;4. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong;5. Institut für Geowissenschaften, Johann Wolfgang Goethe-Universität, 60438 Frankfurt Am Main, Germany;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China;4. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;1. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Center for Global Tectonics, China University of Geosciences, Wuhan 430074 China;3. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;4. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;1. State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Department of Earth Sciences, University of Adelaide, SA 5005, Australia;3. School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China;4. Faculty of Science, Kochi University, Akebono-cho 2-51, Kochi 780-8520, Japan;5. State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 10069, China;3. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Northern Taibai Street 229, Xi''an 710069, China;4. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;5. College of Urban and Environmental Science, Northwest University, Northern Taibai Street 229, Xi''an 710069, China |
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| Abstract: | In this paper we present new paleomagnetic and paleontological data from the Ordovician and Silurian carbonate rocks of Kotelny Island (the Anjou Archipelago), and from the Ordovician turbidities of Bennett Island (the De Long Archipelago). It is assumed that both archipelagos belong to the NSI (New Siberian Islands) terrane — a key tectonic element in the Arctic region. Ages of the studied rocks have been established by paleontological data and lithological correlations. Our new data on conodonts combined with those from previous studies of Ordovician and Silurian fauna indicate a biogeographic similarity between the shelves of the Siberian paleocontinent and the NSI in the Early Paleozoic. Three new paleomagnetic poles for the NSI (48.9°N, 13.8°E, A95 = 18.1° for 475 Ma; 45.5°N, 31.9°E, A95 = 11.0° for 465 Ma, and 33.7°N, 55.7°E, A95 = 11.0° for 435 Ma) fall between the south-eastern part of Central Europe and the Zagros Mountains. The similarity of paleomagnetic directions from Kotelny and Bennet islands confirms that both the Anjou and De Long archipelagos belong to the same terrane. Calculated paleolatitudes indicate that in Ordovician–Silurian times this terrane has been located between 30° and 45°, possibly in the northern hemisphere. Based on this observation, we suggest a linkage between the NSI and the Kolyma–Omolon superterrane. Comparison of apparent polar wander paths (APWPs) of the NSI, Siberia and other cratons/terranes suggests that the NSI drifted independently. We demonstrate that the structural line between Svyatoy Nos Peninsula and Great Lyakhovsky Island is the continuation of the Kolyma Loop suture on the Arctic shelf, and expect that the continuation of the South Anyui suture is to be found east of the NSI. |
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