First Data on the Age and PT Formation Conditions of Zones of Low-Angle Dip Schistosity of the Belomorian Mobile Belt


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Abstract

The low-angle dip schistosity zones of the Belomorian mobile belt of northern Karelia are zones of plastic flow of thrust origin. They were formed from 1.85 to 1.90 Ga: 1879 ± 21 Ma according to 40Ar/39Ar for amphibole from amphibolites and 1857 ± 13 Ma according to the Sm–Nd isochron in amphibolites. The PT parameters of rock metamorphism in low-angle dip schistosity zones correspond to the boundary of amphibolite and granulite facies of metamorphism: T = 640–765°C, rarely rising to 826°C; P = 8.0–11.7 kbar. The hypothesis of the two-stage Paleoproterozoic metamorphism of rocks of the Belomorian mobile belt was introduced.

About the authors

V. M. Kozlovskiy

Karelian Research Center

Author for correspondence.
Email: bazil@igem.ru
Russian Federation, Petrozavodsk, 185510

V. V. Travin

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Email: bazil@igem.ru
Russian Federation, Moscow, 119017

A. V. Travin

Sobolev Institute of Geology and Mineralogy, Siberian Branch; National Research Tomsk State University

Email: bazil@igem.ru
Russian Federation, Novosibirsk, 630090; Tomsk, 634050

V. M. Savatenkov

Institute of Precambrian Geology and Geochronology

Email: bazil@igem.ru
Russian Federation, St. Petersburg, 199034

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