gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0666gtcrust-1561Research ArticleДИСКУССИЯDISCUSSIONВАРИАЦИИ СОСТАВА И СТРОЕНИЯ ЛИТОСФЕРНОЙ МАНТИИ ПОД РАЗНОВОЗРАСТНЫМИ КИМБЕРЛИТОВЫМИ ПОЛЯМИ СИБИРСКОЙ ПЛАТФОРМЫLITHOSPHERIC MANTLE COMPOSITION AND STRUCTURE VARIATIONS UNDER THE SIBERIAN PLATFORM KIMBERLITE FIELDS OF DIFFERENT AGESПохиленкоН. П.PokhilenkoN. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090

1 Pirogov St, Novosibirsk 630090

АфанасьевВ. П.AfanasievV. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

АгашевА. М.AgashevA. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПохиленкоЛ. Н.PokhilenkoL. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ТычковН. С.TychkovN. S.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202212102022134666666Copyright © Похиленко Н.П., Афанасьев В.П., Агашев А.М., Похиленко Л.Н., Тычков Н.С., 20222022Похиленко Н.П., Афанасьев В.П., Агашев А.М., Похиленко Л.Н., Тычков Н.С.Pokhilenko N.P., Afanasiev V.P., Agashev A.M., Pokhilenko L.N., Tychkov N.S.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/1561

Обсуждается проблема различий состава и строения литосферной мантии Сибирской платформы под разновозрастными кимберлитовыми полями. Целью работы являлось выяснение характера, масштабов и вероятных причин эволюции состава и строения литосферной мантии различных блоков платформы на основании изучения пироповых гранатов из разновозрастных кимберлитов различных полей. Анализ полученных результатов показал наличие существенных различий в мощности литосферы различных блоков не только на разное время (среднепалеозойское и мезозойское), но и для одного времени, причем наибольшие различия мощности отдельных блоков литосферы характерны для среднепалеозойского времени. На основании изучения пироповых гранатов из осадочных коллекторов палеозойского возраста получены прямые признаки существования на донижнекарбоновое время блоков мощной литосферы (до 230–240 км) под южным обрамлением Оленекского поднятия (участки к северу и югу от Кютюнгдинского прогиба), а также под западным и восточным обрамлением Уджинского поднятия. Значительные вариации интенсивности и масштабов метасоматоза силикатного типа установлены на основании изучения пиропов из перидотитов разрезов литосферной мантии, «опробованных» кимберлитами полей как среднепалеозойского, так и триасового возраста. Полученные результаты прямо указывают на высокие перспективы выявления новых полей высокоалмазоносных кимберлитов среднепалеозойского возраста в ряде районов Сибирской платформы, в первую очередь ее арктических территорий.

We discuss herein the differences both in composition and structure of the lithospheric mantle of the Siberian Platform under kimberlite fields of different ages. Having analyzed the pyrope garnets from kimberlites of different ages this study aimed to identify the genesis, extent and probable causes for the evolution of the composition and structure of the lithospheric mantle within various SP blocks. Acquired results revealed noticeable differences in the lithosphere thickness of different blocks for Middle Paleozoic and Mesozoic, as well as within the same time. It was found, that the greatest differences in the thickness of the lithosphere individual blocks are typical for the Middle Paleozoic. The results obtained for pyrope garnets from the Paleozoic sedimentary secondary collectors was used to get direct evidence on the existence of thick lithosphere blocks (230–240 km) under the southern margin of the Olenek uplift, north and south of the Kyutyungde trough, as well as under the western and eastern margins of the Udzhinsky uplift. Significant variations in the intensity and extent of silicate-type metasomatism were identified by investigating of pyropes from peridotites of the lithospheric mantle, sampled by kimberlites of both Middle Paleozoic and Triassic fields. Direct evidence indicates high prospects for discovering new fields of diamondiferous high-grade kimberlites of the Middle Paleozoic age in some areas of the Siberian Platform, primarily in its Arctic region.

Сибирская платформакимберлитыпиропылитосферная мантиямантийный метасоматозSiberian platformkimberlitespyropeslithospheric mantlemantle metasomatismДанное исследование выполнялось в рамках базового проекта ИГМ СО РАН, а также было поддержано РФФИ (грант 20-05-00662). Авторы благодарны сотрудникам Аналитического центра многоэлементных и изотопных исследований ИГМ СО РАН (г. Новосибирск, Россия), где проводились аналитические исследования.This study was implemented for the basic project of the IGM SB RAS, and was supported by the Russian Foundation for Basic Research (grant 20-05-00662).ReferencesAfanasiev V.P., Pokhilenko N.P., 2022. Approaches to the Diamond Potential of the Siberian Craton: A New Paradigm. Ore Geology Reviews 147, 104980. https://doi.org/10.1016/j.oregeorev.2022.104980.Afanasiev V.P., Pokhilenko N.P., 2022. Approaches to the Diamond Potential of the Siberian Craton: A New Paradigm. 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The authors declare that there are no conflicts of interest present.