Rhyolite-granite association in the Central Taimyr zone: Evidence of accretionary-collisional events in the Neoproterozoi

статья в журнале
Авторы: Proskurnin V.F.     Petrushkov B.S.     Gavrish A.V.     Bagaeva A.A.     Vinogradova N.P.     Larionov A.N.     Vernikovsky V.A.   (ИНГГ СО РАН)   Metelkin D.V.   (ИНГГ СО РАН)   Vernikovskaya A.E.   (ИНГГ СО РАН)   Matushkin N.Y.   (ИНГГ СО РАН)  
дата публикации: 2014
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 900-830 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 from 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 continent-island arc accretion and collision that occurred at approximately 870-820 Ma. We established that the studied rocks belong to a long granitoid belt extending from Mamont-Shrenk to Faddei terrane, where 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
первоисточник: Russian Geology and Geophysics
том: 1
страницы: 18-32
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