Granophyre Norites and Diorites of the Jarva-Varaka Massif (Monchegorsk Ore Area, Kola Region, Russia): Geology, Petrography, Geochemistry, Geochronology and Origin

Nerovich, L. I.; Kaulina, T. V.; Bayanova, T. B.; Il’chenko, Vadim; Gannibal, M. A.; Kunakkuzin, E. L.; Bazai, Ayya V.; Mudruk, S. V.; Borisenko, E. S.; Sosnovskaya, M. A.

doi:10.1134/s0016702923060071

Geochem. Int.

2023

DOI: 10.1134/s0016702923060071

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Granophyre Norites and Diorites of the Jarva-Varaka Massif (Monchegorsk Ore Area, Kola Region, Russia): Geology, Petrography, Geochemistry, Geochronology and Origin

L. I. Nerovich

T. V. Kaulina

T. B. Bayanova

et al.

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Cited by 2 publications

References 33 publications

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Комплексные Геохронологические И Геохимические Исследования Предположительно Импактного Циркона Древнее 2,8 Млрд Лет В Породах Беломорской Эклогитовой Провинции

Докукина,

Конилов,

Шешуков

et al. 2024

AnalyticsRussia

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Методом лазерной абляции с индуктивно связанной плазмой было проведено U-Th-Pb изотопное датирование магматических и метаморфических цирконов, извлеченных из эгирин-содержащих гнейсов в Гридинском меланже Беломорской эклогитовой провинции. Магматические ядра с возрастом 2,89–2,83 млрд лет датируют протолиты. Метаморфические зерна и каймы дали диапазон возрастов 2,80–1,8 млрд лет с пиками ~2,80, 2,75, 2,70 и 1,8 млрд лет, отвечающими последовательности тектонометаморфических событий в регионе. Наряду с типичным цирконом обнаружены зерна с необычными гетерогенными ядрами, в строении которых сочетаются гранулярные, везикулярные и вермикулярные текстуры. В них, по данным спектроскопии комбинационного рассеяния, наблюдаются преобразования от кристаллического до аморфного состояния. Микрогранулированные цирконы интерпретируются как свидетельства мезоархейского импактного события примерно 2,87 млрд лет или древнее.

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Комплексные Геохронологические И Геохимические Исследования Предположительно Импактного Циркона Древнее 2,8 Млрд Лет В Породах Беломорской Эклогитовой Провинции

Докукина,

Конилов,

Шешуков

et al. 2024

AnalyticsRussia

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Microstructural Deformation and the Age of Monazite-(Ce) from Diatectite Granite in the Jarva-Varaka Structure (Kola Region, Russia)

Kaulina,

Shilovskih,

Nerovich

et al. 2023

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Microstructural deformation and the age of monazite (Ce) from diatectite granite of the presumably impact Jarva-Varaka structure in the Kola Region (northeastern Fennoscandian Shield) are presented. Biotite diatectite granite forms lenses in the aluminous gneisses of the Kola group hosting the 2.5-Ga-layered Jarva-Varaka Massif (JVM). A sample of biotite granite was collected northeast of the Jarva-Varaka Massif near the earlier described pseudotachylitic breccias. BSE images revealed primary domains in monazite grains with rhythmic euhedral zoning and secondary altered domains. Backscattered electron diffraction maps of monazite grains document the development of deformation twins along {100} and {001} and plastically deformed domains with a maximum misorientation of up to 10°. Newly formed areas of recrystallization (neoblasts) cut the twins and plastically deformed domains. Monazite yielded a U-Pb age of 2706 ± 10 Ma (ID-TIMS method), which defines the crystallization age of the host diatectite granite coeval to the 2.76–2.70 Ga metamorphism of the Kola gneisses. A similar age of 2734 ± 139 Ma (ThO2*–PbO isochron) was obtained for primary monazite domains by the chemical U-Th-total Pb isochron method (CHIME). Domains altered under late hydrothermal processes yield CHIME ages of 1796–1723 Ma. Monazite neoblastic domains are close to primary domains in chemical composition and yielded CHIME ages of 2550–2519 Ma, reflecting probably an influence of the JVM formation. The data obtained are insufficient to confirm the impact origin of the Jarva-Varaka structure, which requires further investigation.

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Granophyre Norites and Diorites of the Jarva-Varaka Massif (Monchegorsk Ore Area, Kola Region, Russia): Geology, Petrography, Geochemistry, Geochronology and Origin

Cited by 2 publications

References 33 publications

Microstructural Deformation and the Age of Monazite-(Ce) from Diatectite Granite in the Jarva-Varaka Structure (Kola Region, Russia)

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