U-Pb age of sphene grains, petrochemical, mineralogical and geochemical features of alkaline rocks of the Bogdo complex (Arctic Siberia)

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Abstract

In the north of the Siberian Platform, east of the Anabar Shield, several identified massifs of alkaline rocks with carbonatites are known: Tomtorsky, Bogdo, Promezhutochniy, as well as Bualkalakh, Chuempe, Uele, which are projected according to geophysical data and forming a large alkaline-carbonatite province. The first data on the composition of alkaline rocks of the Bogdo massif were obtained, which correspond to a group of feldspathic rocks of the main composition: rischorrites, biotite-aegirine libenerite syenites, carbonatized, with symplectites and nepheline-feldspar aggregates, pseudo-leucite nepheline syenites. Sphenes were extracted from various types of rocks of the Bogdo massif and their U-Pb age was determined using the SHRIMP-II secondary-ion microprobe. The calculated U-Pb age corresponds to 394,4 ± 3,2 Ma, which is close to the age stage established for the Tomtor massif and the age of the rocks of the Kola alkaline province. One of the reasons for the manifestation of alkaline plume magmatism in this territory may be the influence of the peripheral zone Africa Large Low Shear Velocity Province (“Tuzo”) in the Baltic and Siberia during the Devonian era.

About the authors

N. L. Dobretsov

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

Email: zhmodik@igm.nsc.ru

Academician of the Russian Academy of Sciences

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

S. M. Zhmodik

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

Author for correspondence.
Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090

E. V. Lazareva

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

Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

A. V. Tolstov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Research and Development Exploration Enterprise AK ALROSA

Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 678170, Republic of Sakha, Lenin street, 6

D. K. Belyanin

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

Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090

O. N. Surkov

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

Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

N. N. Dobretsov

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

Email: zhmodik@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

N. V. Rodionov

"A.P. Karpinsky Russian Geological Research Institute"

Email: zhmodik@igm.nsc.ru
Russian Federation, 74, Sredny prospect, St. Petersburg, 199106

S. A. Sergeev

"A.P. Karpinsky Russian Geological Research Institute"

Email: zhmodik@igm.nsc.ru
Russian Federation, 74, Sredny prospect, St. Petersburg, 199106

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