E. N. Terekhov

Geological Institute

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A. S. Baluev

Geological Institute

ТФ

Т. Ф. Щербакова

Kazan State Technical University named after A. N. Tupolev

Yu. A. Morozov

Schmidt Institute of Physics of the Earth

СГ

С. Г. Скублов

Institute of Precambrian Geology and Geochronology

T. B. Bayanova

Kola Science Centre

M. A. Matveev

Schmidt Institute of Physics of the Earth

A. I. Smul’skaya

Schmidt Institute of Physics of the Earth

НБ

Н. Б. Кузнецов

Geological Institute

Pavel Serov

Kola Science Centre

S. Yu. Kolodyazhny

Geological Institute

Cooperative Institutions

Russian Academy of Sciences

Geological Institute

Schmidt Institute of Physics of the Earth

Lomonosov Moscow State University

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

Institute of the Earth’s Crust

Far East Geological Institute

Institute of Precambrian Geology and Geochronology

Czech Academy of Sciences, Institute of Geology

Institute of Geology, Komi Science Centre

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Olivine-bearing rocks of the Lapland granulite belt (Baltic Shield)

Geochemistry International (2016)

E. N. Terekhov Т. Ф. Щербакова A. N. Konilov

Protolith

Amphibole

10.1134/s001670291609010x

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Citations (2)

U–Pb-(SHRIMP-II)-age of zircon from granites of Bolshoy Tyuters Island (Gulf of Finland, Russia) and the problem of the Ediacaran thermal event in the region

Доклады РОССИЙСКОЙ АКАДЕМИИ НАУК Науки о Земле (2024)

С. Г. Скублов E. N. Terekhov Н. Б. Кузнецов A. B. Makeyev Л. И. Салимгараева

New data on the U–Pb age (SHRIMP-II) and trace element composition (SIMS) of zircons from granites of Bolshoy Tyuters Island (Outer Islands of the Gulf of Finland) are presented. The upper intersection of the discordia (1825±11 Ma) is taken as the age of crystallization of granites cutting through secondary quartzites, and thereby determines their youngest age. Subconcordant zircons located in the upper part of the discordia has growth oscillatory zoning and geochemical characteristics of zircons of magmatic origin. The age of the lower intersection of discordia and concordia is about 570 Ma, supported by the independent generation of zircons, represented by black in the CL domains and rims in magmatic zircons, which are characterized by increased contents of non-formula elements (light REE, Ca, P, Ti, Nb, etc. ), up to anomalous values. The most probable interpretation of the age of the lower intersection of discordia and concordia can be considered the Timan (Ediacaran) or Finnmark (Early Caledonian) thermal activation of the Fennoscandian Shield, previously established based on zircons from gneisses of the Kola series.

10.31857/s2686739724070104

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Massifs of Disintegrated Granitoids in the Junction Zone of the East European and West Arctic Platforms: Composition, Age, and Hydrocarbon Potential

Geotectonics (2020)

A. S. Baluev Yu. A. Morozov E. N. Terekhov Т. Ф. Щербакова T. B. Bayanova

Massif

10.1134/s0016852120020028

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Citations (1)

U–Pb Dating of the Sill-Like (Plated) Bodies of the Early Kinematic Series of Gabbrodiorite–Granodiorites in the Svecofennian Fold-and-Thrust Assemblage of the Ladoga Region

Doklady Earth Sciences (2022)

Yu. A. Morozov M. A. Matveev Т. V. Romanyuk A. I. Smul’skaya E. N. Terekhov

Sill

Thrust fault

10.1134/s1028334x2270043x

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Citations (1)

Unusual metasomatites (phyolithites) in the Kolvitskiy gabbro-anorthosite rock mass: composition and structural position

Journal of Mining Institute (2021)

E. N. Terekhov А. Б. Макеев A. S. Baluev Aleksandr Konilov К. В. Ван

Complex mineralogical, geochemical, and geological-structural characteristics of a rare collection stone of violet color, phyolithite, in the southwestern part of the Kola Peninsula. This is a metasomatic rock formed under the conditions of brittle deformations on gabbro-anorthosites of the Paleoproterozoic Kolvitskiy rock mass. As a result of potassium metasomatosis, the plagioclase of the initial rocks was replaced by a fine-grained mica aggregate of muscovite-phengite composition with inclusions of Va-aluminoseladonite (up to 20-30 microns). Ba-aluminoseladonite contains 6.6-10.5 % by weight of BaO. Manganese is the only chromophore that accumulates in the rock during metasomatosis. It is manganese that provides the purple-violet color of pseudomorphs of mica according to anorthite. The phyolithites is depleted by REE and has a positive Eu-anomaly. The phyolithites are confined to the areas of fracturing of the north-eastern strike, located in the zone of dynamic influence of the north-western closure of the Onega-Kandalaksha rift of the Riphean age. Other formations (injection conglomerates and lamproites) are also associated with the formation of this structure, which owe their origin to an intense fluid flow.

Ilmenite

Metasomatism

Anorthosite

Pseudomorph

10.31897/pmi.2021.2.7

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The first data on mass-independent fractionation of sulfur isotopes in sulfides from rocks of the eastern part of the Fennoscandian Shield

Doklady Earth Sciences (2016)

А. В. Игнатьев А. И. Ханчук S. V. Vysotskii T. A. Velivetskaya V. I. Levitskii

Mass-independent fractionation

δ34S

Isotopes of sulfur

Isotopic signature

10.1134/s1028334x16080237

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Citations (2)

Tectonic Features and Stages of Evolution of the Baltic–Mezen Shear Zone in the Phanerozoic, Northwestern Russia

Geotectonics (2020)

S. Yu. Kolodyazhny E. N. Terekhov A. S. Baluev А. В. Полещук Д. С. Зыков

10.1134/s0016852120010057

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Citations (7)

Geochemistry of Sillimanite–Magnetite–Kaolinite Metasomatic Rocks on Great Tyuters Island, Gulf of Finland, Russia

Geochemistry International (2019)

Т. Ф. Щербакова E. N. Terekhov

Metasomatism

Sillimanite

Pegmatite

10.1134/s0016702919060119

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Citations (3)

Finding of corundum-bearing rocks in the Lapland granulite belt

Doklady Earth Sciences (2016)

E. N. Terekhov Т. Ф. Щербакова A. N. Konilov

Corundum

Massif

Pyroxene

10.1134/s1028334x16090208

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Geochemical Aspects of the Frictional Melting of Metapsammites during Seismic Slips (with Reference to Pseudotachylytes of the Ladoga Region)

Doklady Earth Sciences (2023)

Yu. A. Morozov M. A. Matveev С. Г. Скублов A. I. Smul’skaya E. N. Terekhov

Abstract Based on analytical data on the geochemistry of tectonic pseudotachylytes and their host rocks, the specific trends of redistribution of major, trace, and rare earth elements in the course of seismogenic frictional melting of the arkosic metaterrigenous rocks from three zones of regional metamorphism with different temperatures (greenschist, amphibolite, and granulite) in the Northern Ladoga region are discussed. Oppositely directed trends of changes in the contents of the oxides of major elements in the protolith–blastocataclasite–pseudotachylyte triad were revealed, and a unidirectional increase in the basicity of the frictional melt as compared with the protolith was established at the same time. Geochemical evidence for partial selective melting of the protoliths is discussed. The specific features of the fractionation of trace and rare-earth elements during the transition of the protolith into the melt, as well as during its subsequent partial recrystallization, are shown. The emergence of a peak of elevated europium contents relative to the protolith in the melt matrix of all three sampling points is noted. Based on changes in the concentrations of these elements in the zones of pseudotachylyte substrate generation and in the areas of its moving and injection, the estimates of their differential mobility during frictional melting in a dynamic slip zone are given.

Protolith

10.1134/s1028334x22601833

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