Isotope-Geochemical Features of the Migmatites of the Taratash Metamorphic Complex (Southern Urals)

The article presents data on migmatites of the Taratash metamorphic complex, Southern Urals. We studied the Sm-Nd isotopic system in ultrametamorphic processes leading to partial melting of a protolith and migmatization. The Sm-Nd isotopic system of the rocks indicates the contribution of Paleoarche...

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Bibliographic Details
Published in:Geochemistry international 2022-10, Vol.60 (10), p.911-927
Main Authors: Somsikova, A. V., Anosova, M. O., Fedotova, A. A., Fugzan, M. M., Kirnozova, T. I., Tevelev, A. V., Astrakhantsev, O. V.
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Geochemistry
Geochronometry
Isotopes
Metamorphism
Metamorphism (Geology)
Migmatites
Radiometric dating
Rocks, Metamorphic
Thorium
Uranium
Zircon
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Summary:The article presents data on migmatites of the Taratash metamorphic complex, Southern Urals. We studied the Sm-Nd isotopic system in ultrametamorphic processes leading to partial melting of a protolith and migmatization. The Sm-Nd isotopic system of the rocks indicates the contribution of Paleoarchean protolith (T Nd2 = 3.2–3.6 Ga) to the Taratash metamorphic complex, with the predominance of the crustal component (ɛ Nd (T) from −7.6 to −10.5). Based on morphology, U-Pb isotopic age, and Th/U-ratio, zircon found in melanosome and leucosome of the migmatites is subdivided into two generations. The main stage of migmatization occurred within 2.1–1.8 Ga ago and was triggered by granulite metamorphism at 2.06 Ga. Zircon grains of this stage have the low uranium concentration (213–469 ppm) at typical thorium concentration (180–631 ppm), Th/U = 0.8–1.7.
ISSN:0016-7029
1556-1968
DOI:10.1134/S001670292210010X