gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0653gtcrust-1548Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSИЗОТОПНЫЙ СОСТАВ УГЛЕРОДА И КИСЛОРОДА КАЛЬЦИТОВ ЩЕЛОЧНО-УЛЬТРАМАФИЧЕСКИХ ДАЕК УРИКСКО-ИЙСКОГО ГРАБЕНАISOTOPE COMPOSITION OF CARBON AND OXYGEN IN CALCITES OF ALKALINE ULTRAMAPHIC DYKES WITHIN THE URIK-IYA GRABENДаниловаЮ. В.DanilovaYu. V.

664033, Иркутск, ул. Лермонтова

128 Lermontov St, Irkutsk 664033

СавельеваВ. Б.SavelyevaV. B.

664033, Иркутск, ул. Лермонтова

128 Lermontov St, Irkutsk 664033

БазароваЕ. П.BazarovaE. P.

664033, Иркутск, ул. Лермонтова

128 Lermontov St, Irkutsk 664033

ДаниловБ. С.DanilovB. S.

664033, Иркутск, ул. Лермонтова

128 Lermontov St, Irkutsk 664033

ПономарчукВ. А.PonomarchukV. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202212102022134653653Copyright © Данилова Ю.В., Савельева В.Б., Базарова Е.П., Данилов Б.С., Пономарчук В.А., 20222022Данилова Ю.В., Савельева В.Б., Базарова Е.П., Данилов Б.С., Пономарчук В.А.Danilova Y.V., Savelyeva V.B., Bazarova E.P., Danilov B.S., Ponomarchuk V.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1548

Исследован изотопный состав углерода и кислорода в кальците даек и жил ультрамафических лампрофиров, кимберлита, щелочных слюдяных пикритов Ярминской надинтрузивной зоны и беспироксеновых пикритов, прорывающих породы Большетагнинского карбонатитового массива в пределах Урикско-Ийского грабена (Восточное Присаянье). Данные δ13C (от −6.6 до −3.9 ‰ относительно VPDB) соответствуют представлениям о мантийном происхождении карбонатного вещества даек. Высокие значения δ18O (от +13.9 до +11.8 ‰ относительно VSMOW) свидетельствуют о воздействии дейтерических флюидов (магматические флюиды, отделившиеся от расплавов) на поздней стадии формирования кальцитсодержащих щелочно-ультрамафических пород

The isotope composition of carbon and oxygen was studied in calcite of dykes and veins of ultramafic lamprophyres, kimberlite, alkaline mica picrites from the Yarma above-intrusion zone, and pyroxene-free picrites intruding the rocks of the Bolshetagninsky carbonatite massif within the Urik-Iya graben hosted by the East Sayan Mountains. The data on δ13C (from −6.6 to −3.9 ‰ relative to VPDB) disclose the ideas on the mantle origin of the carbonate substance of dykes. High values of δ18O (from +13.9 to +11.8 ‰ relative to VSMOW) suggest the impact of deuteric fluids, i.e. magmatic fluids separated from melts, at later stage of formation of the calcite-bearing alkaline ultramafic rocks.

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The authors declare that there are no conflicts of interest present.