New data on genesis of the crust in the eastern segment of the Middle Urals: Sr–Nd isotopic constraints

被引：0
|
作者：
V. N. Smirnov
Yu. L. Ronkin
V. N. Puchkov
N. G. Soloshenko
M. V. Streletskaya
机构：
[1] Russian Academy of Sciences,Zavaritskii Institute of Geology and Geochemistry, Ural Branch
[2] Russian Academy of Sciences,Institute of Geology, Ufa Scientific Center
来源：
Doklady Earth Sciences | 2016年 / 467卷
关键词：
DOKLADY Earth Science; 86Sr; Middle Devonian; Active Continental Margin; Eastern Segment;
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摘要：
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.
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页码：331 / 336
页数：5
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