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The De Long Islands: A missing link in unraveling the Paleozoic paleogeography of the Arctic
St. Petersburg State University, Russia. (Faculty of Geology)ORCID iD: 0000-0002-9661-1708
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0001-6095-2941
Russian Academy of Sciences, Yakutsk, Russia. (Diamond and Precious Metal Geology Institute)ORCID iD: 0000-0002-8956-3699
All Russian Geological Institute (VSEGEI), St. Petersburg.
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2015 (English)In: Gondwana Research, ISSN 1342-937XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

The vast Laptev and East Siberian shelves in the eastern Russian Arctic, largely covered by a shallow sea and buried beneath sea ice for 9 months of the year, remain one of the least studied parts of continental crust of the Earth and represent a big unknown when performing pre-Cenozoic geodynamic reconstructions of the Arctic. The De Long islands provide a vitally important window into the geology of this area and are a key for [1] understanding  the Early Paleozoic history of the Amerasian Arctic. Four of them (Jeanette, Henrietta, Bennett and Zhokhov islands) were studied using structural data, petrographic and geochemical analyses and U-Pb zircon age dating to offer the following new constraints for the Early Paleozoic paleogeography of the Arctic realm. The basement beneath the De Long Islands is of Late Neoproterozoic to earliest Cambrian age, about 670-535 Ma. In the Early Paleozoic, the De Long Islands were located along the broad Timanian margin of Baltica, with a clastic sediment provenance from the Timanian, Grenville-Sveconorwegian, and Baltic Shield domains. The Cambro-Ordovician volcaniclastic successions on Jeannette and Henrietta islands formed part of a continental margin volcanic arc with a corresponding back-arc basin located to the south (in present co-ordinates). On the continent-ward side of the back-arc basin, shallow marine shelf clastic and carbonate rocks were deposited, which are exposed today on Bennett Island in the south-west of the archipelago (in modern coordinates). The De Long Islands together with other continental blocks, such as Severnaya Zemlya, Arctic Alaska-Chukotka, and the Alexander Terrane, formed the contiguous active continental margin of Baltica during the Early Paleozoic. Today however, these terranes are spread out over a distance of 5000 km across the Arctic and eastern Pacific margins due to the subsequent opening of a series of Late Paleozoic, Mesozoic and Cenozoic oceanic basins.

Place, publisher, year, edition, pages
Elsevier, 2015.
Keyword [en]
De Long Islands, New Siberian Islands, Arctic, Russia, Early Paleozoic
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URN: urn:nbn:se:uu:diva-256390DOI: 10.1016/j.gr.2015.05.016OAI: oai:DiVA.org:uu-256390DiVA: diva2:825224
Available from: 2015-06-23 Created: 2015-06-23 Last updated: 2015-07-21

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Ershova, Victoria B.Lorenz, HenningProkopiev, Andrei V.Khudoley, Andrei K.Sergeev, SergeyLarionov, Alexander N.
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