The age of the basement of Arctic Alaska – Chukotka microplate on the example of the Velitkenay granite-migmatitic dome (NE Russia)

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Abstract

The basement of Arctic Alaska – Chukotka microcontinent (AACHM) is exposed in Velitkenay granite-metamorphic dome of Chukotka. U-Pb (SIMS) geochronological study of the orthogneisses of the basement, paragneisses after Paleozoic rocks and leucogranites of Velitkenay pluton in the central and southwestern parts of this structure is carried out. Neoproterozoic ages of basement orthogneisses (velitkenay complex) and Albian ages of granitoids of Velitkenay pluton are confirmed. The latter concides with the age of orthogneisses migmatization. The youngest zircon clasters from paragneisses within velitkenay complex have Cambrian and Silurian ages, single zircon crystals contain inherited 1.7 and 1.9 Ma cores. The сorrelation of Neoproterozoic orthogneisses of Velitkenay granite-metamorphic dome with similar complexes of the other AACHM regions indicates unity of its basement. It is offered to enter velitkenay metamorphic complex into the legend of Chukotka series of the third-generation geological map sheets.

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About the authors

M. V. Luchitskaya

Geological Institute of the Russian Academy of Sciences

Author for correspondence.
Email: luchitskaya@ginras.ru
Russian Federation, Моscow

D. V. Bushueva

A.P. Karpinsky Russian Geological Research Institute

Email: luchitskaya@ginras.ru
Russian Federation, Saint-Petersburg

K. N. Mazurkevich

A.P. Karpinsky Russian Geological Research Institute

Email: luchitskaya@ginras.ru
Russian Federation, Saint-Petersburg

S. D. Sokolov

Geological Institute of the Russian Academy of Sciences

Email: luchitskaya@ginras.ru

Corresponding Member of the RAS

Russian Federation, Моscow

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2. Fig. 1. Geological map of the Velitkenay granite-dome structure, compiled based on materials from [1, 3, 4]. 1 - Neoproterozoic Velitkenay complex (undifferentiated orthogneisses, migmatites and leucogranites): a - epidote-amphibolite and b - amphibolite facies; 2 - Devonian carbonate-terrigenous deposits; 3 - Carboniferous carbonate-terrigenous deposits; 4 - Triassic flyschoid deposits; 5 - volcanics and tuffs of the Okhotsk-Chukotka volcanic belt: a - acidic composition, b - basic composition; 6 - Permian-Triassic gabbros and gabbro-dolerites; 7 - Quaternary deposits; 8 - spectacle gneisses after Cretaceous monzonitoids; 9 – granitoids: a – leucogranites, b – monzonites and granodiorites; 10 – greenschist facies of metamorphism; 11 – geochronological samples.

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3. Fig. 2. Photo of migmatized orthogneisses of the Velitkenai complex.

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4. Fig. 3. Microphotographs of zircon crystals in the cathodoluminescence mode (a) and diagrams with concordia (b, c) for zircon from orthogneisses (samples 4047-4 and 1039-5) of the central part of the Velitkenai granite-metamorphic dome. The point numbers correspond to the numbers in Table 1.

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5. Fig. 4. Concordia diagrams for zircon from paragneisses (samples 1039-10 and 1044-9) of the central part of the Velitkenai granite-metamorphic dome (a, b) and micrographs of zircon crystals in the cathodoluminescence mode (c, d). The point numbers correspond to the numbers in Table 1.

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6. Fig. 5. Micrographs of zircon crystals in the cathodoluminescence mode (a) and diagrams with concordia (b–e) for zircon from leucogranites of the central (samples 1041/5, 1050, 4036-1/5) and southwestern (sample 4048-5) parts of the Velitkenay granite-metamorphic dome. The point numbers correspond to the numbers in Table 2.

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