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

T. A. Pilitsyna; Пилицына Т. А.; K. G. Erofeeva; Ерофеева К. Г.; A. V. Samsonov; Самсонов А. В.; A. V. Postnikov; Постников А. В.; D. A. Varlamov; Варламов Д. А.

doi:10.31857/S2686739722602836

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

Authors: Pilitsyna T.A.¹^,2, Erofeeva K.G.¹, Samsonov A.V.¹, Postnikov A.V.³, Varlamov D.A.⁴
Affiliations:
1. Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
2. Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements
3. Gubkin Russian State University of Oil and Gas (National Research University)
4. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences
Issue: Vol 510, No 1 (2023)
Pages: 52-60
Section: PETROLOGY
Submitted: 14.10.2023
Published: 01.05.2023
URL: https://journal-vniispk.ru/2686-7397/article/view/135841
DOI: https://doi.org/10.31857/S2686739722602836
EDN: https://elibrary.ru/FEXQGG
ID: 135841

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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.

Keywords

HT/MP-type metamorphism, thermobarometry, winTWQ, GeoPS, metapelites, Paleoproterozoic orogen, Volga-Uralia

References

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