New data on genesis of the crust in the eastern segment of the Middle Urals: Sr–Nd isotopic constraints
- Authors: Smirnov V.N.1, Ronkin Y.L.1, Puchkov V.N.2, Soloshenko N.G.1, Streletskaya M.V.1
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Affiliations:
- Zavaritskii Institute of Geology and Geochemistry, Ural Branch
- Institute of Geology, Ufa Scientific Center
- Issue: Vol 467, No 2 (2016)
- Pages: 331-336
- Section: Geology
- URL: https://journals.rcsi.science/1028-334X/article/view/188223
- DOI: https://doi.org/10.1134/S1028334X16040152
- ID: 188223
Cite item
Abstract
The analysis of the Sr and Nd isotopic composition in different granitoids of the Verkhisetsk, Shartash, Krasnopolsk, Petrokamensk, and Shabry massifs, which were successively formed in the island arc, continental marginal, and collisional geodynamic settings during the period from the Middle Devonian to the early Permian, revealed that 87Sr/86Sr0 values in them vary from 0.70331 to 0.70431 and εNd(t), from +1.9 to +6.2. The two-stage model Nd age of granitoids (938–629 Ma) indicates that their magma originates from material at least Neoproterozoic in age, not younger. The observed variations in the Nd model ages of granitoids and 87Sr/86Sr0 values provide grounds for assuming the primary heterogeneity of the source of granitoid melts.
About the authors
V. N. Smirnov
Zavaritskii Institute of Geology and Geochemistry, Ural Branch
Author for correspondence.
Email: smirnov@igg.uran.ru
Russian Federation, Pochtovyi per. 7, Yekaterinburg, 620075
Yu. L. Ronkin
Zavaritskii Institute of Geology and Geochemistry, Ural Branch
Email: smirnov@igg.uran.ru
Russian Federation, Pochtovyi per. 7, Yekaterinburg, 620075
V. N. Puchkov
Institute of Geology, Ufa Scientific Center
Email: smirnov@igg.uran.ru
Russian Federation, ul. Karla Marksa 16, Ufa, 450077
N. G. Soloshenko
Zavaritskii Institute of Geology and Geochemistry, Ural Branch
Email: smirnov@igg.uran.ru
Russian Federation, Pochtovyi per. 7, Yekaterinburg, 620075
M. V. Streletskaya
Zavaritskii Institute of Geology and Geochemistry, Ural Branch
Email: smirnov@igg.uran.ru
Russian Federation, Pochtovyi per. 7, Yekaterinburg, 620075