ТА

Т. А. Мыскова

Institute of Precambrian Geology and Geochronology

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P. A. Lvov

Institute of Precambrian Geology and Geochronology

РИ

Р. И. Милькевич

Institute of Precambrian Geology and Geochronology

N. G. Berezhnaya

St Petersburg University

IА

I. А. Zhitnikova

A.P. Karpinsky Russian Geological Research Institute

СГ

С. Г. Скублов

Institute of Precambrian Geology and Geochronology

N. M. Ivanov

M. A. Korsakova

A. S. Nikonova

A.P. Karpinsky Russian Geological Research Institute

S. L. Presnyakov

A.P. Karpinsky Russian Geological Research Institute

КА

Константин Алексеевич Никонов

A.P. Karpinsky Russian Geological Research Institute

Cooperative Institutions

Russian Academy of Sciences

Institute of Precambrian Geology and Geochronology

A.P. Karpinsky Russian Geological Research Institute

Geological Institute

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

St Petersburg University

Institute of the Earth’s Crust

Kola Science Centre

Czech Academy of Sciences, Institute of Geology

Vinogradov Institute of Geochemistry

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The Composition and Age of the Mesoarchean Gabbro in the South Vygozersky and Kamennoozersky Greenstone Structures, Karelia

Petrology (2018)

Т. А. Мыскова I. А. Zhitnikova P. A. Lvov

Baddeleyite

Greenstone belt

10.1134/s0869591118010071

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Citations (1)

THE ALUMINOUS GNEISSES OF KOLA SERIES, BALTIC SHIELD (GEOCHEMISTRY, NATURE AND AGE OF PROTOLITH)

Proceedings of the Karelian Research Centre of the Russian Academy of Sciences (2016)

Т. А. Мыскова Р. И. Милькевич Т. А. Мыскова Р. И. Милькевич

The geochemical and isotopic data were obtained for gneisses of the Kola Series, Baltic Shield. They are metamorphosed in granulite facies and interpreted according to the igneous nature of zircons and gneisses. The biotitic and garnet-biotitic gneisses are paralleled to the rocks of TTG associations in terms of the structure of correlation between the main elements. Sil ± Crd-Grt-Bt gneisses are formed on Grt-Bt gneisses as a result of blastomylonitization and partial melting. U-Pb zircon ages (SHRIMP-II) were determined for both gneiss species. All analytical points of magmatic zircons in the concordia diagram for Grt-Bt gneisses form a continuous trend extended in concordia in the range of 2909 ± 8 – 2732 ± 13 Ma. It is interpreted as the result of lead loss from magmatic zircons during the slow cooling of tonalite in the lower crust. Minimal age of magmatism and early granulitic metamorphism estimated by most ancient zircon is 2.9 Ga. The time of manifestation of younger granulite metamorphism determined by newly-formed zircon shells from Crd-Sil-Grt-Bt gneiss corresponds to the interval 2707 ± 9 – 2656 ± 8 Ma. Part of the zircon from Crd-Sil-Grt-Bt gneiss is profoundly altered crystals with a discordant age of 2740 ± 6 – 2639 ± 9 Ma, which is similar to that of metamorphic shells, suggesting an event happened at that time which disrupted the crystalline grid and caused the loss of radiogenic lead. Three ancient zircons with a maximum age of 3461 ± 5 MA are interpreted as captured zircons, which indicate the presence of continental crust at this point in the northern part of the Baltic Shield.

Protolith

Baltic Shield

Anatexis

10.17076/geo359

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Citations (5)

Multistage Svecofennian metamorphism: Evidence from the composition and U-Pb age of titanite from eclogites of the Belomorian Mobile Belt

Petrology (2014)

С. Г. Скублов А. В. Березин Н. Г. Ризванова А. Е. Мельник Т. А. Мыскова

Titanite

Pegmatite

10.1134/s0869591114040067