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Middle Paleozoic basic magmatism of the northwestern Vilyui Rift: Composition, sources, and geodynamics

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Abstract

Middle Paleozoic magmatism at the eastern Siberian platform was related to riftogenic processes, which were most clearly expressed in the Vilyui Rift and led to the formation of rift depressions filled with sedimentary-volcanogenic rocks and extended basaltic dike belts in rift shoulders. Two fields of diamondiferous kimberlites were found along with basaltic dikes in the Vilyui-Markha dike belt surrounding rift in the northwest. Active subalkali basaltic magmatism predated the emplacement of kimberlite bodies, which occasionally (Nyurba pipe) are cut by dikes of potassium alkali basalts. Based on geochemical and Sr-Nd isotopic characteristics, deep-seated sources were determined for the intrusive and volcanic basalts of the northwestern shoulder of the Vilyui rift. The REE distribution patterns of the studied rocks normalized to the primitive mantle are close to that of OIB, except for somewhat higher HREE. In the diagrams of indicator ratios of trace and rare-earth elements, the basalts are also plotted in the OIB field, being located between the end member of plume composition (FOZO) and enriched mantle sources. The rocks have positive εSr (+3.5 and +28.6) and εNd (+1.3 and +5.3). In a diagram εNd(T)-εSr(T), two fields with distinct content of radiogenic Sr are distinguished, which can be regarded as derived by mixing of the moderately depleted PREMA-type mantle and a source enriched in radiogenic Sr. Available isotope-geochemical data confirm that OIB type basalts of the region were generated by plume activity. The geodynamic setting of Middle Paleozoic magmatism and rifting in the eastern part of the Siberian platform is considered in light of plume-lithosphere interaction. The sequence of tectonomagmatic events during evolution of the Vilyui rift is consistent with the model of plume-lithosphere interaction or the model of active rifting.

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Authors and Affiliations

  1. Institute of the Earth’s Crust, Siberian Division, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia

    A. I. Kiselev & K. N. Egorov

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia

    V. V. Yarmolyuk, R. A. Chernyshov & A. V. Nikiforov

Authors
  1. A. I. Kiselev
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  2. V. V. Yarmolyuk
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  3. K. N. Egorov
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  4. R. A. Chernyshov
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  5. A. V. Nikiforov
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Original Russian Text © A.I. Kiselev, V.V. Yarmolyuk, K.N. Egorov, R.A. Chernyshov, A.V. Nikiforov, 2006, published in Petrologiya, 2006, Vol. 14, No. 6, pp. 626–648.

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Kiselev, A.I., Yarmolyuk, V.V., Egorov, K.N. et al. Middle Paleozoic basic magmatism of the northwestern Vilyui Rift: Composition, sources, and geodynamics. Petrology 14, 588–608 (2006). https://doi.org/10.1134/S0869591106060051

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