New isotope constraints on the time of formation of the Nersinskii dolerite complex from the Biryusa-Sayan area

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Abstract


New data on the Sm-Nd isotopic composition of the dolerites of the Nersinskii complex that are consistent with the petrographic study and the U-Pb dating of detrital zircon from the overlying sedimentary sequences of the Biryusa-Sayan area are presented. The data obtained indicate the absence of the supposed magmatic event 1.6 billion years ago and clearly indicate the Neoproterozoic age of the intrusions. Their source could have been the metasomatized mantle; after formation, dolerites went through several stages of metasomatism, which was reflected in the evolution of its isotopic systems.


About the authors

E. A. Vasyukova

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: lenav@inbox.ru

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090

D. V. Metelkin

Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences

Email: lenav@inbox.ru

Russian Federation, 1, Pirogova street, Novosibirsk, 630090; 3, Koptyg prosrect, Novosibirsk, 630090

F. A. Letnikov

Institute of the Earth`s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: lenav@inbox.ru

Russian Federation, 128, Lermontova street, Irkutsk, 664033

Academician of the Russian Academy of Sciences

E. F. Letnikova

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: lenav@inbox.ru

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

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