gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0661gtcrust-1556Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSГРАНАТЫ ИЗ КИМБЕРЛИТОВОЙ ТРУБКИ МИР: ХИМИЧЕСКИЙ СОСТАВ И СВИДЕТЕЛЬСТВА МЕТАСОМАТИЧЕСКИХ ПРОЦЕССОВ В ЛИТОСФЕРНОЙ МАНТИИXENOLITH GARNETS FROM MIR KIMBERLITE PIPE: CHEMICAL COMPOSITION AND EVIDENCE OF METASOMATIC PROCESSES IN THE LITHOSPHERE MANTLEКалашниковаТ. В.KalashnikovaT. V.

664033, Иpкутcк, ул. Фаворского 1а

1а Favorsky St, Irkutsk 664033

КостровицкийС. И.KostrovitskyS. I.

664033, Иpкутcк, ул. Фаворского 1а

1а Favorsky St, Irkutsk 664033

СиницынК. А.SinitsynK. A.

664033, Иpкутcк, ул. Фаворского 1а

1а Favorsky St, Irkutsk 664033

ЮдинцеваЭ. Э.YudintsevaE. E.

664033, Иpкутcк, ул. Фаворского 1а

1а Favorsky St, Irkutsk 664033

Институт геохимии им. А.П. Виноградова СО РАНРоссияVinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of SciencesRussian Federation202212102022134661661Copyright © Калашникова Т.В., Костровицкий С.И., Синицын К.А., Юдинцева Э.Э., 20222022Калашникова Т.В., Костровицкий С.И., Синицын К.А., Юдинцева Э.Э.Kalashnikova T.V., Kostrovitsky S.I., Sinitsyn K.A., Yudintseva E.E.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/1556

Целью работы являлось изучение состава литосферной мантии под кимберлитовой трубкой Мир. Авторами была исследована коллекция мантийных ксенолитов из трубки Мир (57 образцов). Образцы представлены перидотитами (зернистые гранатовые лерцолиты) и пироксенитами (гранатовые вебстериты, гранатовые клинопироксениты и эклогиты). На основе данных по петрографическим особенностям, составу минералов (гранат, клинопироксен) составлена вещественная характеристика различных типов пород в литосферной мантии под кимберлитовой трубкой Мир, также с помощью различных геотермобарометров были рассчитаны Р-Т-условия кристаллизации пород. Гранаты из перидотитов отличаются относительно высокой магнезиальностью (75–83) и низким содержанием TiO2 (до 0.2 мас. %). Эклогиты характеризуются высококальциевым (3.78–9.46 мас. %) и высокожелезистым (7.77–17.20 мас. %) составом граната, на диаграмме Н.В. Соболева попадая в область верлитового парагенезиса. В целом гранаты из литосферной мантии под Мирнинским кимберлитовым полем характеризуются низкотитанистым составом граната (до 0.7 мас. %), отличаясь от высокотитанистых гранатов Далдынского кимберлитового поля. Таким образом, литосферная мантия под Мирнинским кимберлитовым полем отличается от литосферной мантии под другими алмазоносными полями более широким развитием эклогитов и пироксенитов (до 50 %), низко-Ti составом пород и отсутствием деформированных лерцолитов. Данные признаки, вероятно, свидетельствуют о минимальном проявлении силикатного метасоматоза в литосферной мантии под кимберлитовой трубкой Мир (в отличие от центра Сибирского кратона).

This paper reports the results on the composition of lithosphere mantle under the Mirny kimberlite field. The authors investigated 57 samples of the mantle xenoliths collected from the Mir pipe. The samples were represented by peridotites (Grt lherzolites) and pyroxenites (Grt websterite, Grt clinopyroxenite and eclogite). The composition of minerals (garnet, clinopyroxene) and various rocks in the lithosphere mantle under the Mirny kimberlite field were analyzed based on petrographic features and chemical data. Besides, PT conditions of rock crystallization were calculated using different geothermobarometers. Garnets from peridotites and websterites show relatively high Mg# (75–83) and low TiO2 contents (up to 0.2 wt. %). Since the eclogite has high-Ca (3.78–9.46 wt. %) and high-Fe (7.77–17.20 wt. %) garnet composition, it lies in the area of wehrlite paragenesis. In general, garnets from the lithosphere mantle under the Mirny kimberlite field have low-Ti garnet composition (up to 0.7 wt. %). Thus, the lithosphere mantle under the Mirny kimberlite field differs from the lithosphere mantle under other diamondiferous fields in a widespread development of eclogite and pyroxenite (up to 50 %), low-Ti composition of rocks, as well as virtual absence of deformed lherzolites. These signs probably indicate minor alteration of silicate metasomatism in the lithospheric mantle under the Mirny field (in contrast to the center of the Siberian craton).

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