METAMORPHISM OF UNI SUITE AS AN INDICATOR OF EARLY PRECAMBRIAN COLLISION PROCESSES IN THE VYATKA BELT, BASEMENT OF THE VOLGA-URALIA

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Abstract

In the central part of the Vyatka belt, sandwiched between the Archean blocks in the northeast of the Volga-Ural segment of the East European craton, according to the core data from two deep wells, the following mineral parageneses were established in the metapelites of the Uni suite: (1) Pl + Ms + Bt + Qz + Kfs + And ± Chl and (2) Pl + Bt + Qz + Kfs + Grt + Sil ± Ms ± Chl (without staurolite and cordierite), corresponding to moderate pressure metamorphism of the amphibolite facies. To determine the P-T conditions for these parageneses a set of methods was used, including classical (Grt-Bt, GASP, Ti-in-Bt, Ms-Bt) and multi-equilibrium thermobarometry (winTWQ 2.34), as well as the isopleth intersection method on pseudosection diagrams (GeoPS 3.2.2.128). The calculated P-T values of metamorphism are 520–650°C (or up to 690°C according to the isopleth method) and 2–5.4 kbar. Paragenesis (2) rock was accompanied by anatexis in the water-saturated system. Zoning can be distinguished in the metamorphism of the rocks, it belongs to a relatively shallow type, to the andalusite-sillimanite subfacies.

About the authors

T. A. Pilitsyna

Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences; Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements

Author for correspondence.
Email: allafia@yandex.ru
Russian, Moscow; Russian, Moscow

K. G. Erofeeva

Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: allafia@yandex.ru
Russian, Moscow

A. V. Samsonov

Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: allafia@yandex.ru
Russian, Moscow

A. V. Postnikov

Gubkin Russian State University of Oil and Gas (National Research University)

Email: allafia@yandex.ru
Russian, Moscow

D. A. Varlamov

Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: allafia@yandex.ru
Russian, Moscow, Chernogolovka

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Copyright (c) 2023 Т.А. Пилицына, К.Г. Ерофеева, А.В. Самсонов, А.В. Постников, Д.А. Варламов