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- Title
The Sr, Nd, and Hf isotopic geochemistry of rocks of the gabbro-diorite-tonalite association from the Eastern Segment of the Middle Urals as an indicator of the age of the continental crust in this area.
- Authors
Smirnov, V.; Ivanov, K.; Ronkin, Yu.; Koroteev, V.; Serov, P.; Gerdes, A.
- Abstract
According to isotopic analysis of rocks of the Reft gabbro-diorite-tonalite complex (Middle Urals), gabbro and related diorite and dikes and vein-shaped bodies of plagiogranitoids, crosscutting gabbro, are similar to the depleted mantle substance in ε( T) = 8.6-9.7 and ε( T) = 15.9-17.9. Their model Hf ages are correlated with the time of crystallization. Here, the tonalites and quartz diorites constituting most of the Reft massif are characterized by lower values: ε( T) = 3.7-6.0, ε( T) = 11.1-12.7, and T values significantly exceeding the age datings. This is evidence that Neoproterozoic crustal rocks were a source of parental magma for these rocks. The primary Sr/Sr ratio in rocks of both groups is highly variable (0.70348-0.70495). The data obtained allow us to reach the conclusion that the Reft gabbro-diorite-tonalite complex was formed as a result of nearly synchronous processes occurring in the crust and the mantle within a limited area.
- Subjects
URAL Mountains (Russia); IGNEOUS rock analysis; ISOTOPIC analysis; GEOCHEMISTRY; CONTINENTAL crust; STRONTIUM isotopes; NEODYMIUM isotopes; HAFNIUM isotopes
- Publication
Doklady Earth Sciences, 2017, Vol 474, Issue 1, p516
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X17050269