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Evolution of the Meyeri Thrust Zone of the Northern Ladoga Region (Republic of Karelia, Northwest Russia): PT Conditions for the Formation of Mineral Parageneses and Geodynamic Reconstructions

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Abstract

In our study we characterize the thermodynamic regimes in the thrust zone of the newly formed Paleoproterozoic continental crust of the Svecofennian mobile belt on the outskirts of the Archean Karelian continent along the sublatitudinal, in modern coordinates, powerful strike-slip zone of the Northern Ladoga area. The Meyeri thrust zone is divided into northern and southern domains, considered allochthonous and autochthonous blocks according to material composition and structural features. The autochthonous block of the northern domain is different from the allochthonous block of the southern one by the presence of gneiss domes with Archean rocks in the cores. The allochthonous block is composed only of Paleoproterozoic rocks. During the formation of the thrust zone 1.86–1.85 Ga ago, the low-temperature amphibolite facies of biotite–muscovite parageneses were developed after the early mineral parageneses of the high-temperature amphibolite and granulite facies.

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ACKNOWLEDGMENTS

We are sincerely grateful to V.V. Balagansky (Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia) for reviewing the manuscript of this article and valuable recommendations. We are grateful to D.V. Dolivo-Dobrovolsky (Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia) for a set of geothermobarometers in his PTQuick program [31], to the reviewer A.A. Shchipansky (Geological Institute, Russian Academy of Sciences, Moscow, Russia), S.Yu. Kolodyazhnyi (Geological Institute, Russian Academy of Sciences, Moscow, Russia) for comments that made it possible to improve the article.

Funding

The research was carried out within the state assignment from the Ministry of Science and Higher Education of the Russian Federation (the project no. 132-2019-0013 of the Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences).

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Correspondence to Sh. K. Baltybaev.

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Translated by D. Voroshchuk

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Baltybaev, S.K., Vivdich, E.S. Evolution of the Meyeri Thrust Zone of the Northern Ladoga Region (Republic of Karelia, Northwest Russia): PT Conditions for the Formation of Mineral Parageneses and Geodynamic Reconstructions. Geotecton. 55, 502–515 (2021). https://doi.org/10.1134/S0016852121040038

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  • DOI: https://doi.org/10.1134/S0016852121040038

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