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U-Pb age of sphene grains, petrochemical, mineralogical and geochemical features of alkaline rocks of the Bogdo complex (Arctic Siberia)
- Authors: Dobretsov N.L.1, Zhmodik S.M.1,2, Lazareva E.V.1, Tolstov A.V.1,3, Belyanin D.K.1,2, Surkov O.N.1, Dobretsov N.N.1, Rodionov N.V.4, Sergeev S.A.4
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Affiliations:
- Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
- Novosibirsk State University
- Research and Development Exploration Enterprise AK ALROSA
- "A.P. Karpinsky Russian Geological Research Institute"
- Issue: Vol 489, No 3 (2019)
- Pages: 281-285
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/18595
- DOI: https://doi.org/10.31857/S0869-56524893281-285
- ID: 18595
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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, 630090S. 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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