Paleoproterozoic Dacite Dykes of the Vorontsovka Terrane, Volga-Don Orogen: Geochemistry, Age and Petrogenesis

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Abstract

The metamorphosed dacitic porphyry dykes were established for the first time in the western part of the Vorontsovska terrane, which is located in the Paleoproterozoic Volga-Don orogen at the margin of Archean Sarmatia and Volga-Ural cratons. The magmatic protolith age for the metadacites is ca. 2.07 Ga. They are ferrous, metaluminous rocks of calc-alkali series and belong to I-type granitoids. Sodium specialization, low concentrations of Mg, Cr, Ni, incoherent elements with sufficient REE fractioning and absence of Eu*-anomalies, high Sr/Y ratio and especially (Gd/Yb)n values (>10), and also radiogenic Nd isotopic composition suppose the juvenile mafic source for the dacitic melts. According to petrogenetic estimations, such conditions could be caused by partial melting of depleted N-MORB type basites at the equilibrium with the eclogitic restite. Supposed mechanism for the dacitic magmas forming is the partial melting of the basites from the lower horizons of crust with highly enlarged thicknes (>60 km) due to preceding collision processes.

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About the authors

Konstantin A. Savko

Voronezh State University

Author for correspondence.
Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

Aleksandr V. Samsonov

Institute of Ore Geology, Petrography, Mineralogy and Geochemistry RAS

Email: samsonov@igem.ru
Russian Federation, Moscow

E. H. Korish

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

Nikolay S. Bazikov

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

Aleksandr N. Larionov

Karpinsky Russian Geological Research Institute

Email: ksavko@geol.vsu.ru

Centre for Isotope Research

Russian Federation, St. Petersburg

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Supplementary files

Supplementary Files
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2. Fig. 1. Schematic geological map of the Voronezh crystalline massif. The position of the crustal segments of the East European craton according to (Gorbatschev and Bogdanova, 1993).

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3. Fig. 2. Geological column sq. 548-c and micrographs of dacite porphyry sections: (a–d) – modified plagioclase xenocrysts in fine-grained quartz feldspar matrix; (e) – zonality of plagioclase xenocryst in dacite. The numbering of the samples in the figure is: well number/depth.

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4. Fig. 3. Classification diagrams for dacites of the Vorontsov terrane: (a) (Na2O + K2O)–SiO2; (b) A/CNK– A/NK; (c) FeOtot/(FeOtot + MgO)–SiO2; (d) (Na2O + K2O – CaO)–SiO2.

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5. Fig. 4. Distribution diagrams of petrogenic oxides.

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6. Fig. 5. Distribution of rare earths normalized to chondrite (a) and distribution of small and rare (b) elements in dacites normalized to primitive mantle.

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7. Fig. 6. The location of the age determination points on the CL images of zircons from the metadacites of the Vorontsov terrane. The point numbers in the figure correspond to the analysis numbers in Table 2.

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8. Fig. 7. Results of U-Pb dating of zircon from metadacites of Vorontsov terrane by SIMS method.

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9. Fig. 8. Results of Sm-Nd studies of metadacytes of the Vorontsov terrane. Data on granites of the Vorontsov terrane from (Savko et al., 2014).

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10. Fig. 9. Discriminant diagrams for metadacites of the Vorontsov terrane: (a) – by (Pearce, 1996); (b) – by (Whalen et al., 1987).

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11. Fig. 10. Compositions of dacites of the Vorontsov terrane on discriminant diagrams for adakites (Drummond, Defant, 1990).

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12. Fig. 11. The results of modeling the formation of dacites and rhyolites.

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