Evidence for polymetamorphic evolution of the Precambrian geological complexes of the Transangarian Yenisei Ridge

According to the core data from two deep holes, the following mineral assemblages were identified in metapelitic rocks of the Uni Suite in the central part of the Vyatka Belt, sandwiched between Archean blocks in the northeastern part of the Volgo–Uralian Segment of the East European Craton: (1) Pl + Ms + Bt + Qz + Kfs + And ± Chl and (2) Pl + Bt + Qz + Kfs + Grt + Sil ± Ms ± Chl. A set of methods including classical (Grt–Bt, GASP, Ti-in-Bt, and Ms–Bt) and multi-equilibrium thermobarometry (winTWQ 2.34), as well as the isopleth intersection method on pseudosection diagrams (GeoPS 3.2.2.128), was applied to estimate the P–T conditions for these assemblages. The calculated P–T parameters of metamorphism are 520–650°C (or up to 690°C, according to the isopleth method) and 2–5.4 kbar. Metamorphism of paragneiss containing assemblage (2) was accompanied by anatexis in the water-saturated system. Metamorphism of rocks of the Uni Suite belongs to the relatively shallow type of the andalusite–sillimanite facies series and amphibolite facies and relates to deformations during orogenes.

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Metamorphism of the Uni Suite as an Indicator of Early Precambrian Collisional Processes in the Vyatka Belt, Northeast of Volgo–Uralia

Pilitsyna

Erofeeva

Самсонов

et al. 2023

Dokl. Earth Sc.

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Metamorphism of Uni Suite as an Indicator of Early Precambrian Collision Processes in the Vyatka Belt, Basement of the Volga-Uralia

Pilitsyna,

Erofeeva,

Samsonov

et al. 2023

Doklady Rossijskoj akademii nauk. Nauki o Zemle

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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.

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Provenance, Age, and Tectonic Settings of Rock Complexes (Transangarian Yenisey Ridge, East Siberia): Geochemical and Geochronological Evidence

Лиханов

2022

Geosciences

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The tectonic evolution of the Siberian Cratonic margins offers important clues for global paleogeographic reconstructions, particularly with regard to the complex geological history of Central Asia and Precambrian supercontinents Columbia/Nuna and Rodinia and its subsequent breakup with the opening of the Paleo-Asian Ocean. Here, we present an overview of geochemical, petrological, and geochronological data from a suite of various rocks to clarify the age, tectonic settings, and nature of their protolith, with an emphasis on understanding the tectonic history of the Yenisey Ridge fold-and-thrust belt at the western margin of the Siberian Craton. These pre-Grenville, Grenville, and post-Grenville episodes of regional crustal evolution are correlated with the synchronous successions and similar style of rocks along the Arctic margin of Nuna-Columbia and Rodinia and support the possible spatial proximity of Siberia and North Atlantic cratons (Laurentia and Baltica) over a long period ~1.4-0.55 Ga.

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Evidence for polymetamorphic evolution of the Precambrian geological complexes of the Transangarian Yenisei Ridge

Cited by 3 publications

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Metamorphism of the Uni Suite as an Indicator of Early Precambrian Collisional Processes in the Vyatka Belt, Northeast of Volgo–Uralia

Metamorphism of the Uni Suite as an Indicator of Early Precambrian Collisional Processes in the Vyatka Belt, Northeast of Volgo–Uralia

Metamorphism of Uni Suite as an Indicator of Early Precambrian Collision Processes in the Vyatka Belt, Basement of the Volga-Uralia

Provenance, Age, and Tectonic Settings of Rock Complexes (Transangarian Yenisey Ridge, East Siberia): Geochemical and Geochronological Evidence

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