gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-5-0785UHDVTFgtcrust-1921Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSСООТНОШЕНИЕ МЕЖДУ δ¹³С, δ¹⁸О И СОДЕРЖАНИЕМ РЗЭ В КАРБОНАТИТАХ ТОМТОРСКОГО МАССИВА, РЕСПУБЛИКА САХА (ЯКУТИЯ)RELATION BETWEEN δ13С, δ18О AND REE CONTENT IN CARBONATITES OF THE TOMTOR COMPLEX, SAKHA REPUBLIC (YAKUTIA)https://orcid.org/0000-0003-2264-0634ПономарчукВ. А.PonomarchukV. A.

630090, Новосибирск, пр-т Академика Коптюга, 3 

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-6617-3287ЛазареваЕ. В.LazarevaE. V.

630090, Новосибирск, пр-т Академика Коптюга, 3 

3 Academician Koptyug Ave, Novosibirsk 630090

lazareva@igm.nsc.ruhttps://orcid.org/0000-0001-8095-4485ЖмодикС. М.ZhmodikS. M.

630090, Новосибирск, пр-т Академика Коптюга, 3 

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0002-5640-4560ТравинА. В.TravinA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3 

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0003-3863-5071ТолстовА. В.TolstovA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3 

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202418102024155785785Copyright © Пономарчук В.А., Лазарева Е.В., Жмодик С.М., Травин А.В., Толстов А.В., 20242024Пономарчук В.А., Лазарева Е.В., Жмодик С.М., Травин А.В., Толстов А.В.Ponomarchuk V.A., Lazareva E.V., Zhmodik S.M., Travin A.V., Tolstov A.V.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/1921

Проведено комплексное изучение фосфорно-редкометалльных (полиминеральных) карбонатитов (I) и редкометалльных (анкеритовых) карбонатитов (II) Томторского массива с использованием методов ИСП-МС, РФА, РФА-СИ, СЭМ и изотопного определения С, О и ⁸⁶Sr/⁸⁷Sr. При близком минеральном составе содержание РЗЭ+Y в карбонатитах (I) составляет в среднем 0.38 мас. %, а в карбонатитах (II) – 1.3 мас. %. Изотопный состав С и О карбонатитов (I) и (II) отражается на диаграмме δ¹⁸О – δ¹³С в виде двух пересекающихся трендов: первый тренд (карбонаты из скв. 4041, 6151, 115-117) отражает вторичную генерацию карбонатов, образовавшуюся с участием дейтерического флюида; второй тренд отражает преобразование карбоната низкотемпературным флюидом при соотношении флюид/порода = 5. Установлено возрастание содержаний РЗЭ и δ¹⁸О в карбонатитах по мере снижения температуры их формирования и обогащение пород минералами редких земель, связанное со снижением мобильности РЗЭ во флюиде по мере снижения температуры.

The paper reports the comprehensive study of phosphorus-rare metal (polymineral) carbonatites (I) and rare metal (ankerite) carbonatites (II) of the Tomtor massif based on ICP-MS, XRF, XRF-SI, SEM methods and isotope determination of C, O and 86Sr/87Sr. With a similar mineral composition, the REE+Y content in carbonatites (I) averages 0.38 wt. %, and in carbonatites (II) it is 1.3 wt. %. The δ18О-δ13С diagram provides the C and O isotopic compositions of carbonatites (I) and (II) as two intersecting trends: (I) carbonates from wells 4041, 6151, 115-117 represent the secondary generation of carbonates derived with the deuterium fluid involved; (II) depicts transformation of carbonate by low-T fluid, with fluid/rock ratio = 5. The study identified an increase in the REE and δ18O contents in carbonatites as the temperature of their formation decreases and enrichment of rocks with REE minerals, associated with REE mobility reduction in the fluid while the temperature is decreasing.

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