A. D. Nozhkin

Research Field

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Citations (8)

New data on Late Riphean volcanism in northern part of the Yenisey ridge

International Geology Review (1973)

A.G. Mironov A. D. Nozhkin

Riphean

10.1080/00206817309475968

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Citations (0)

Sapphirine-bearing granulites of the anabar shield

Геохимия (2019)

A. D. Nozhkin И. И. Лиханов К. А. Савко А. А. Krylov Pavel Serov

The results of a detailed study of the mineral and chemical composition, geothermobarometry, and U-Pb isotope dating of zircon of high-aluminous sapphirine-bearing crystals of shales associated with biotite-garnet-sillimanite gneisses, hypersthene-two feldspar and high-potassium hypersthene orthogneisses, Ti-rich and subalkaline metabasites belonging to the Kilegirian Formation of the Daldyn series of the Anabar shield. Unlike the known granulites of the Daldin and Upper Ananbar series, the rocks of this association are enriched in K, Rb, Ba, Th, light REEs, differing in elevated (La/Yb)n. The results of thermobarometry yielded the P–Tparameters of formation and evolution of sapphirine-bearing granulites in the Anabar shield with peak values of UHT metamorphism in the range of T= 920–1000°C at P= 9–11 kbar. Isotope-geochronological data indicate a polymetamorphic evolution of these rocks. Detrital zircon cores in the center of crystals yielded ages of 3.36, 2.75, 2.6, and 2.5 Ga. Later, superimposed metamorphic transformations of the detrital zircon formed rims dated to 2.4, 2.3, 2.2, and 1.8 Ga. The timing of formation of aluminous metasedimentary and associated metamagmatic rocks can be estimated in the interval from 2.5 to 2.4 billion years. A potential provenance source of the detrital zircons could be hypersthene plagiogneisses and metabasites of the Daldyn series with a premetamorphic age no less than 3.3 Ga, and products of their metamorphism of about 2.7 Ga old, and possibly not yet detected in the region Na-K granites with an age of about 2.6–2.5 billion years, known on other shields and enriched with radioactive (K, Th, U) and rare elements. An additional source of clastic material in the formation of aluminous sediments could be the associated two feldspar magmatic rocks of rhyolite composition, having the same model age with them.

Baltic Shield

10.31857/s0016-7525645486-502

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Petrogeochemical and isotope peculiarities of supersubduction terrigenous deposits: The example of Predivinsk Terrane of the Yenisei Ridge

Doklady Earth Sciences (2013)

A. D. Nozhkin Н. В. Дмитриева Pavel Serov А. В. Маслов

Terrigenous sediment

10.1134/s1028334x13100115

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Citations (2)

Sources and formation conditions of Early Proterozoic granitoids from the southwestern margin of the Siberian craton

Petrology (2006)

О. М. Turkina A. D. Nozhkin T. B. Bayanova

Massif

Migmatite

Titanite

10.1134/s0869591106030040

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Citations (50)

Oceanic and riftogenic metavolcanic associations of greenstone belts in the northwestern part of the Sharyzhalgai Uplift, Baikal region

Petrology (2008)

О. М. Turkina A. D. Nozhkin

Felsic

Amphibole

10.1134/s0869591108050044

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Citations (29)

Stages of Late Proterozoic magmatism and periods of Au mineralization in the Yenisei Ridge

Russian Geology and Geophysics (2011)

A. D. Nozhkin A.S. Borisenko Peter A. Nevolko

Plutonism

Orogeny

Terrigenous sediment

10.1016/j.rgg.2010.12.010

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Citations (63)

First finding of nepheline rocks in northern Yenisey Range

International Geology Review (1967)

A. D. Nozhkin V.K. Cherepnin

Alkalic nepheline rocks were discovered in the Srednyaya and Pravaya Noyba interstream areas, as alluvial-deluvial piles at different altitudes, in proximity of outcrops of quartz and alkalic syenites to which they may be related genetically. The alumina potential of this part of the range is augmented particularly by the associated rare-metals mineralization. — IGR Staff.

Nepheline

Nepheline syenite

Outcrop

10.1080/00206816709474542

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Citations (1)

Age of blastomilonites of the Yenisei regional shear zone as evidence of the Vendian accretionary-collision events at the western margin of the Siberian Craton

Doklady Earth Sciences (2013)

И. И. Лиханов В. В. Ревердатто С. В. Зиновьев A. D. Nozhkin

Continental Margin

Rodinia

Collision zone