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Russian Geology and Geophysics

2014 year, number 1

THE RHYOLITEGRANITE ASSOCIATION IN THE CENTRAL TAIMYR ZONE: EVIDENCE OF ACCRETIONARYCOLLISIONAL EVENTS IN THE NEOPROTEROZOIC

V.F. Proskurnin1, V.A. Vernikovsky2,3, D.V. Metelkin2,3, B.S. Petrushkov1, A.E. Vernikovskaya4, A.V. Gavrish1, A.A. Bagaeva1, N.Yu. Matushkin2,3, N.P. Vinogradova1, A.N. Larionov1
1, V.O., Srednii pr. 74, St. Petersburg, 199106, Russia
2A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, ul. Pirogova 2, 630090, Russia
3Novosibirsk State University
4A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090, Russia
Keywords: Granites, rhyolites, geochemistry, geochronology, Neoproterozoic, accretion and collision, paleomagnetic reconstructions, Arctic framing of the Siberian craton

Abstract

The Central Taimyr accretionary belt includes two granite-metamorphic terranes: Faddei and Mamont-Shrenk, which include the oldest igneous formations of the Taimyr folded area in the Arctic framing of the Siberian craton—granitoids and granite-gneisses with U–Pb zircon ages of 900830 Ma. The [FeO*/(FeO* + MgO)] enriched granitoids of these terranes are products of highly fractionated I -type magmas. This paper presents results of new petrographic, geochemical, geochronological, and paleomagnetic investigations of acid rocks fr om a volcanic-plutonic association (in the region of the Leningradskaya River) in the Faddei terrane in the northeastern Taimyr area. These rocks formed during the final stage of continentisland arc accretion and collision that occurred at approximately 870820 Ma. We established that the studied rocks belong to a long granitoid belt extending from Mamont-Shrenk to Faddei terrane, wh ere all the igneous bodies are deformed and oriented uniformly. The paleomagnetic pole we calculated differs significantly from the apparent polar-wander path interval of corresponding age for Siberia. The 33.8°± 5.4 angular distance between the poles indicates that the formation of this volcanic-plutonic association took place at a significant distance from the Taimyr margin of the Siberian paleocontinent.

DOI: http://dx.doi.org/10.1016/j.rgg.2013.12.002