GEOCHEMICAL FEATURES OF DIKE AILLIKITES AND ALKALINE ROCKS OF THE BOLSHETAGNINSKY MASSIF (URIK-IYA GRABEN, EAST SAYAN REGION)
https://doi.org/10.5800/GT-2022-13-2s-0614
Abstract
The ICP-MS determinations have been made on microelement content of ~650–640 Ma ultramafic lamprophyre-aillikite dikes and alkaline silicate rocks and carbonatites from the Bolshetagninsky ijolite-syenite massif, spatially overlapped in the northern Urik-Iya graben on the southwestern margin of the Siberian craton. There have been identified two types of spectra of microelement distribution, typical of the Bolshetagninsky massif aillikites and alkaline silicate rocks, respectively; both types of spectra demonstrate significant (more than two orders of magnitude) enrichment in most incompatible elements relative to the primitive mantle. Aillikites have tilt-left distribution spectra of rare elements with Rb, К, Pb, Sr-P, Zr-Hf, ±U minimums and less-pronounced Y minimum. Multi-element spectra of ijolites-melteigites are characterized by Th, Та, Pb, Hf, ±Zr, ±Ti minimums which is also reflected in nepheline syenite and carbonatite spectra. The Bolshetagninsky massif aillikites and alkaline rocks differ also in Nb/Ta, Zr/Hf, Th/Nb, Th/U ratios. Geochemical differences imply that the parental melts of dike aillikites and alkaline rocks are derived from different mantle sources.
Supporting agencies: The study was funded by Russian Science Foundation (RSF-18-17-00101). The research activities involved work equipment of Shared Research Facilities "Geodynamics and Geochronology" of the Institute of the Earth's Crust SB RAS, as part of the grant 075-15-2021-682
About the Authors
V. B. Savelieva
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
128 Lermontov St, Irkutsk 664033
E. P. Bazarova
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
128 Lermontov St, Irkutsk 664033
Yu. V. Danilova
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
128 Lermontov St, Irkutsk 664033
B. S. Danilov
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
128 Lermontov St, Irkutsk 664033
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Review
For citations:
Savelieva V.B., Bazarova E.P., Danilova Yu.V., Danilov B.S. GEOCHEMICAL FEATURES OF DIKE AILLIKITES AND ALKALINE ROCKS OF THE BOLSHETAGNINSKY MASSIF (URIK-IYA GRABEN, EAST SAYAN REGION). Geodynamics & Tectonophysics. 2022;13(2):0614. (In Russ.) https://doi.org/10.5800/GT-2022-13-2s-0614
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