Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1859510.31857/S0869-56524893281-285Research ArticleU-Pb age of sphene grains, petrochemical, mineralogical and geochemical features of alkaline rocks of the Bogdo complex (Arctic Siberia)DobretsovN. L.<p>Academician of the Russian Academy of Sciences</p>zhmodik@igm.nsc.ruZhmodikS. M.zhmodik@igm.nsc.ruLazarevaE. V.zhmodik@igm.nsc.ruTolstovA. V.zhmodik@igm.nsc.ruBelyaninD. K.zhmodik@igm.nsc.ruSurkovO. N.zhmodik@igm.nsc.ruDobretsovN. N.zhmodik@igm.nsc.ruRodionovN. V.zhmodik@igm.nsc.ruSergeevS. A.zhmodik@igm.nsc.ruInstitute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesNovosibirsk State UniversityResearch and Development Exploration Enterprise AK ALROSA"A.P. Karpinsky Russian Geological Research Institute"2911201948932812850912201909122019Copyright © 2019, Russian academy of sciences2019<p class="a"><span lang="EN-US">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 </span><span class="Symbol"><span lang="EN-US"></span></span><span lang="EN-US"> 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.</span></p>feldspathic rocksBogdo massifrischorriteslibenerite and pseudoleucite syenitesU-Pb agespheneArctic Siberiaфельдшпатоидные породымассив Богдорисчорритылибенеритовые и псевдолейцитовые сиенитыU-Pb-возрастсфенАрктическая Сибирь[Зайцев А.И., Энтин А.Р., Ненашев Н.И., Лазебник К.А., Тян О.А. Геохронология и изотопная геология Якутии. Якутск: ЯНЦ СО РАН, 1992. 248 с.][Толстов А.В., Тян О.А. Геология и рудоносность массива Томтор. Якутск: ЯНЦ СО РАН, 1999. 164 с.][Охлопков В.И. Отчет о групповой геологической съёмке по работам Верхне-Уджинского объекта Анабарской партии. Амакинская ГРЭ. 1987.][Магматические горные породы. Классификация, номенклатура, петрография. Ч. 2 / Гл. ред. О.А. Богатиков. М.: Наука, 1983. 767 с.][Moller V., Williams-Jones A.T. // J. Petrology. 2016. V. 57. P. 229-276. doi.org/10.1093/petrology/egw003][Rodionov N.V., Lepekhina E.N., Antonov A.V., et al. // Russian Geology and Geophysics. 2018. V. 59. P. 962-974. doi.org/10.1016/j.rgg.2018.07.016][Владыкин Н.В., Котов А.Б., Борисенко А.С., Ярмолюк В.В., Похиленко Н.П., Сальникова Е.Б., Травин А.В., Яковлева С.З. // ДАН. 2014. Т. 454. № 2. С. 195-199. DOI: 10.7868/S0869565214020224.][Заварицкий А.Н. Изверженные горные породы. М.: Изд-во АН СССР, 1961. 479 с.][Kiselev A.I., Ernst R.E., Yarmolyuk V.V., Egorov K.N. // J. Asian Earth Sci. 2012. V. 45. P. 1-16. DOI: 10.1016/ j.jseaes.2011.09.004][Kramm U., Sindern S. In: Phoscorites and Carbonatites from Mantle to Mine: The Key Example of the Kola Alkaline Province. Eds F. Wall, A.N. Zaitsev // Mineralogical Society Series. 2004. V. 10. P. 75-97.][Torsvik T.H., Burke K., Steinberger B., Webb S.J., Ashwal L.D. // Nature. 2010. V. 466. P. 352-355. DOI: 10.1038/nature09216][Лазарева Е.В., Жмодик С.М., Добрецов Н.Л., Толстов А.В., Щербов Б.Л., Карманов Н.С., Герасимов Е.Ю., Брянская А.В. // Геология и геофизика. 2015. Т. 56. № 6. C. 1080-1115. DOI: 10.15372/GiG20150603.]