gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0660gtcrust-1555Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSКСЕНОЛИТЫ ПОЛИМИКТОВЫХ БРЕКЧИЙ ИЗ КИМБЕРЛИТОВ ЯКУТСКОЙ АЛМАЗОНОСНОЙ ПРОВИНЦИИXENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCEПохиленкоЛ. Н.PokhilenkoL. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПохиленкоН. 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

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут 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 Federation202212102022134660660Copyright © Похиленко Л.Н., Похиленко Н.П., Афанасьев В.П., 20222022Похиленко Л.Н., Похиленко Н.П., Афанасьев В.П.Pokhilenko L.N., Pokhilenko N.P., Afanasiev V.P.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/1555

Полимиктовые брекчии, крайне редкие мантийные конгломераты, представляющие собой обломки пород и крупных мантийных минералов, сцементированных мелкозернистой массой, вызывают устойчивый интерес у петрологов мира. В работе проведен сравнительный анализ двух ксенолитов полимиктовых пород из разновозрастных и разнопродуктивных кимберлитовых трубок Сибирского кратона. Близость химического состава ряда минералов полимиктовых брекчий из кимберлитов разных частей Сибирского кратона указывает на возможность формирования этих минералов под воздействием одних и тех же факторов в докимберлитовый период этих частей литосферной мантии. Широкий диапазон составов и хаотичная зональность минералов, наличие структур распада в ортопироксене, ильмените, сульфиде, келифитовые каймы на гранате предполагают неуравновешенность фрагментов изученных ксенолитов. Образец SH18/20 является первой полимиктовой брекчией, демонстрирующей опробование астеносферными расплав-флюидами небольших глубин шпинелевой фации.

The polymictic breccias, extremely rare mantle conglomerates being the fragments of rocks and large mantle minerals cemented with fine-grained mass have been long provoking interest of petrologists worldwide. This work provides a comparative analysis of two xenoliths of polymictic rocks from kimberlite pipes of different age and productivity occurring in the Siberian craton. The similarity of the chemical composition of some minerals of polymictic breccias from kimberlites within different parts of the Siberian craton assumes possible formation of these minerals caused by the same factors in the prekimberlite period of these parts of the lithospheric mantle. A wide range of compositions and chaotic zoning of minerals, the presence of exsolution textures in orthopyroxene, ilmenite, sulfide, and kelyphite rims on garnet suggest that the fragments of the studied xenoliths are unbalanced. Sample SH18/20 is the first polymictic breccia showing asthenospheric melt-fluids sampling shallow depths of the spinel facies.

полимиктовая брекчиякимберлитксенолитверхняя мантиятрубка Ноябрьскаятрубка Удачнаяpolymictic brecciakimberlitexenolithupper mantleNoyabrskaya pipeUdachnaya pipeРабота выполнена при финансовой поддержке РФФИ (грант № 20–05–00662), РНФ (проект № 21–17–00082) и по государственному заданию ИГМ СО РАН. Авторы выражают благодарность В.Н. Королюку и М.В. Хлестову за помощь в проведении аналитических работ, рецензентам – за очень дельные замечания, которые помогли обратить внимание на принципиальные моменты изложения материала, от чего статья только выиграла.This research was funded by the Russian Foundation for Basic Research (Grant 20-05-00662), Russian Scientific Foundation (Project 21-17-00082) and was carried out for state assignment of IGM SB RAS.ReferencesBrey G.P., Kohler T., 1990. Geothermobarometry in Four-Phase Lherzolites II. New Thermobarometers, and Practical Assessment of Existing Thermobarometers. 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The authors declare that there are no conflicts of interest present.