2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 326-8
Presentation Time: 2:45 PM

THE PALEOZOIC HISTORY OF THE NEW SIBERIAN ISLANDS: PROVENANCE, PALEOGEOGRAPHY AND PLATE RECONSTRUCTION


ERSHOVA, Victoria, Regional geology, Saint Petersburg State University, University emb. 7-9, Saint Petersburg, 199094, PROKOPIEV, Andrei, Laboratory Of Geodynamics, and Regional Geology, Diamond and Precious Metal Geology, 39, Lenin Avenue, Yakutsk, Russia, KHUDOLEY, Andrey, Regional geology, Saint Petersburg State University, University emb. 7-9, Saint Petersburg, 199034, SOBOLEV, Nikolay, Karpinsky Russian Geology Research Institute, VSEGEI, 74 Sredny Prospect, St. Petersburg, R-89787 and PETROV, Eugeny, Karpinsky Russian Geology Research Institute, VSEGEI, 74 Sredny Prospect, St. Petersburg, R-119017, Russia

The number of geological studies and interest in the Arctic region has increased dramatically in last years. The one of the important and still poorly studied spots is the New Siberian Islands Archipelago located in the Russian eastern Arctic. We have been done U-Pb dating of detrital zircon from 12 Paleozoic samples collected in the Kotel’ny, Bel’kovsly, Bennett, Henrietta and Jeannette Islands. The studied Cambrian-Lower Carboniferous clastics illustrate prominent peaks within the age range of 630-1700 Ma. The abundant 1090-940 Ma zircons suggest a significant sediment contribution from the Grenvillian-Sveconorwegian Orogen. The 2.0-1.3 Ga detrital zircon population could be attributed to the early evolution of the Grenville Province, and to the ages of Mesoproterozoic to latest Paleoproterozoic terranes in the Sveconorwegian Orogen. The Mesoproterozoic and latest Paleoproterozoic ages are limited reported across the Siberia. The ages of most Siberian Craton basement blocks are predominantly Archean, whilst the age of assembly of the Siberian Craton has been defined as 1800 - 1950 Ma. However, only a few zircons close to this age were identified in the studied samples. Abundant late Neoproterozoic to early Cambrian zircons in the studied sediments suggest a significant sediment contribution from the Timanian Orogen. These results suggest that the New Siberian Islands located along the northern margin of Laurentia-Baltica in the Cambrian-Early Carboniferous. A comparison of detrital zircon signatures from coeval strata across the wider Arctic reveals that Upper Devonian-Permian clastics deposited on the Severnaya Zemlya archipelago, Wrangel Island and New Siberian Islands were all possibly sourced from the same provenance. Our detrital zircon data reveals a major shift in the provenance of clastic sediment in late Carboniferous-Permian time. In sharp contrast to the older samples, the predominantly Paleozoic zircon population of the late Carboniferous - Permian deposits can be correlated to a different magmatic episode reported from the Urals.

Session No. 326

T4. Circum-Arctic Lithosphere-Basin Evolution II
Wednesday, 22 October 2014: 1:00 PM-5:00 PM
121 (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.786
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