gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0664gtcrust-1559Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICS«КЛИНОПИРОКСЕНОВАЯ» ПАЛЕОГЕОТЕРМА ПОД КИМБЕРЛИТОВОЙ ТРУБКОЙ ОБНАЖЕННОЙ: МОЩНОСТЬ ЛИТОСФЕРЫ ПОД КУОЙКСКИМ ПОЛЕМ (СИБИРСКИЙ КРАТОН, ЯКУТИЯ)THE “CLINOPYROXENE” PALEOGEOTHERM BENEATH THE OBNAZHENNAYA KIMBERLITE PIPE AND THIСKNESS OF LITHOSPHERE UNDER THE KUOYKA FIELD (SIBERIAN CRATON, YAKUTIA)МуравьеваЕ. А.MuravjevaE. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ДымшицА. М.DymshitsA. M.

664033, Иркутск, ул. Лермонтова, 128

ШарыгинИ. С.SharyginI. S.

630090, Новосибирск, пр-т Академика Коптюга, 3

664033, Иркутск, ул. Лермонтова, 128

3 Academician Koptyug Ave, Novosibirsk 630090

128 Lermontov St, Irkutsk 664033

ГоловинА. В.GolovinA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ЛогвиноваА. М.LogvinovaA. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ОлейниковО. Б.OleinikovO. B.

677000, Якутск, пр-т Ленина, 39

39 Lenin Ave, Yakutsk 677000

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут 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 РАН; Институт земной коры СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии алмаза и благородных металлов СО РАНРоссияInstitute of Geology of Diamond and Precious Metals, Siberian Branch of the Russian Academy of SciencesRussian Federation202212102022134664664Copyright © Муравьева Е.А., Дымшиц А.М., Шарыгин И.С., Головин А.В., Логвинова А.М., Олейников О.Б., 20222022Муравьева Е.А., Дымшиц А.М., Шарыгин И.С., Головин А.В., Логвинова А.М., Олейников О.Б.Muravjeva E.A., Dymshits A.M., Sharygin I.S., Golovin A.V., Logvinova A.M., Oleinikov O.B.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/1559

На основе химического состава ксенокристаллов клинопироксена и с использованием программного пакета FITPLOT была реконструирована мантийная палеогеотерма под кимберлитовой трубкой Обнаженной (Куойкское поле, Сибирский кратон). Значения мощности литосферы и поверхностного теплового потока для трубки Обнаженной на момент кимберлитового магматизма (мезозой) составили 187–193 км и 41–42 мВт/м2. Полученное значение мощности литосферы значительно меньше, чем в центральной части Сибирского кратона, где располагаются алмазоносные кимберлитовые трубки-месторождения среднепалеозойского возраста (210–230 км), однако оно сопоставимо с таковым в районе высокоалмазоносного поля Кимберли (Каапвальский кратон, Южная Африка). Отсутствие алмазов в трубках Куойкского поля, за исключением убогоалмазоносной трубки Дьянга, может быть связано с интенсивным метасоматическим преобразованием пород литосферной мантии данного региона в мезозое по сравнению с центральной частью Сибирского кратона в среднем палеозое.

The mantle paleogeotherm under the Obnazhennaya kimberlite pipe (Kuoika field, Siberian craton) was reconstructed using the chemical composition of clinopyroxene xenocrystals and the FITPLOT program. The lithosphere thickness 187–193 km and surface heat flow 41–42 mW/m2 were measured for the Obnazhennaya pipe at the time of kimberlite magmatism in the Mesozoic. The lithosphere thickness was found to be much smaller than that in the central part of the Siberian craton (210–230 km), where Paleozoic diamond-bearing kimberlite pipes-deposits are located. It is however comparable to the highly diamond-bearing Kimberley field in the Kaapvaal craton (South Africa). The absence of diamonds in the pipes of the Kuoika field, but poor diamondiferous Dyanga pipe, might be associated with the more intense metasomatic alteration of the rocks within the lithospheric mantle of this region in the Mesozoic time, as compared to the central part of the Siberian craton in the Middle Paleozoic time.

палеогеотермаFITPLOTксенокристаллклинопироксенкимберлитСибирский кратонpaleogeothermFITPLOTxenocrystalclinopyroxenekimberliteSiberian cratonИсследование выполнено за счет гранта Российского научного фонда № 18-77-10062 (https://rscf.ru/project/18-77-10062/). Экспедиционные работы на кимберлитовой трубке Обнаженной выполнялись в рамках государственного задания ИГМ СО РАН и ИГАБМ СО РАН. В работе задействовалось оборудование ЦКП «Геодинамика и геохронология» ИЗК СО РАН в рамках гранта № 075-15-2021-682 (пробоподготовка) и ЦКП «Многоэлементных и изотопных исследований» ИГМ СО РАН (электронно-зондовый микроанализ).The study was financially supported by the Russian Science Foundation (grant 18-77-10062, https://rscf.ru/project/18-77-10062/). Field work was supported by the RF state assignment project for IGM SB RAS and DPMGI SB RAS. 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The authors declare that there are no conflicts of interest present.