2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University HLLHDR pmi-16204 https://pmi.spmi.ru/pmi/article/view/16204 Геология Geology Association of quartz, Cr-pyrope and Cr-diopside in mantle xenolith in V.Grib kimberlite pipe (northern East European Platform): genetic models Ассоциация кварца, Cr-пиропа и Cr-диопсида в мантийном ксенолите из кимберлитовой трубки им. В.Гриба (север Восточно-Европейской платформы): генетические модели Agasheva Elena V. Агашева Е. В. Agasheva Elena V. helenashchukina@gmail.com 0000-0002-9396-8568 Институт геологии и минералогии им. В.С.Соболева (Россия) V.S.Sobolev Institute of Geology and Mineralogy (Russia) Mikhailenko Denis S. Михайленко Д. С. Mikhailenko Denis S. mikhailenkodenis@gmail.com 0000-0003-0585-3021 Институт геологии и минералогии им. В.С.Соболева (Россия) V.S.Sobolev Institute of Geology and Mineralogy (Russia) Korsakov Andrei V. Корсаков А. В. Korsakov Andrei V. akorsakov74@gmail.com 0000-0002-4922-7658 Институт геологии и минералогии им. В.С.Соболева (Россия) V.S.Sobolev Institute of Geology and Mineralogy (Russia) 19 12 2023 2024 268 503 519 04 04 2023 20 09 2023 26 08 2024 © 2023 Е. В. Агашева, Д. С. Михайленко, А. В. Корсаков © 2023 Elena V. Agasheva, Denis S. Mikhailenko, Andrei V. Korsakov 2023 Е. В. Агашева, Д. С. Михайленко, А. В. Корсаков Elena V. Agasheva, Denis S. Mikhailenko, Andrei V. Korsakov Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0) This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://pmi.spmi.ru/pmi/article/view/16204

Приведены первые результаты минералого-геохимического изучения уникального ксенолита литосферной мантии, в котором представлена ранее не описанная минеральная ассоциация кварца, Cr-пиропа и Cr-диопсида. Структурно-текстурные особенности образца позволяют предполагать совместное образование этих минералов. Расчетные Р-Т-параметры образования Cr-диопсида свидетельствуют о захвате ксенолита с интервала глубин ~ 95-105 км (31-35 кбар), соответствующих полю стабильности коэсита. Это позволяет предполагать, что кварц в изученном ксенолите может представлять собой параморфозы по коэситу. Показано, что в данной породе кварц не является продуктом постмагматических процессов. Реконструирован этап преобразования исходного лерцолита в обогащенную гранатом и клинопироксеном породу/гранатовый пироксенит в результате воздействия высокотемпературного силикатного расплава. Последующие этапы влияния метасоматических агентов идентифицированы по наличию отрицательной Eu-аномалии в некоторых зернах граната, что могло быть результатом воздействия субдукционно связанного флюида, и обогащению породообразующих минералов легкими редкоземельными элементами, Sr, Th, U, Nb и Ta как последствие флюида, насыщенного этими несовместимыми элементами. Рассмотрены несколько моделей образования SiO2-фазы (кварц/коэсит) в ассоциации с высокохромистыми мантийными минералами, включающими карбонатизацию мантийных перидотитов/эклогитов и плавление карбонатсодержащих эклогитов на этапе субдукции и воздействие обогащенного SiO2 расплава/флюида субдукционного генезиса с перидотитами литосферной мантии.

The first results of mineralogical and geochemical studies of a unique xenolith of lithospheric mantle are presented illustrating the earlier non-described mineral association of quartz, Cr-pyrope and Cr-diopside. Structural and textural features of the sample suggest a joint formation of these minerals. The calculated P-T-parameters of the formation of Cr-diopside indicate the capture of xenolith from the depth interval ~ 95-105 km (31-35 kbar) corresponding to the stability field of coesite. This suggests that quartz in the studied xenolith can represent paramorphs after coesite. It was shown that quartz in this rock is not a product of postmagmatic processes. The transformation stage of the source lherzolite into garnet- and clinopyroxene-enriched rock/garnet pyroxenite as a result of exposure to a high-temperature silicate melt was reconstructed. Subsequent stages of the influence of metasomatic agents were identified by the presence of a negative Eu-anomaly in some garnet grains, which could result from the impact of subduction-related fluid and the enrichment of rock-forming minerals with light rare earth elements, Sr, Th, U, Nb and Ta as a consequence of fluid saturated with these incompatible elements. Several models for the formation of SiO2 phase (quartz/coesite) in association with high-chromium mantle minerals are considered including carbonatization of mantle peridotites/eclogites and melting of carbonate-containing eclogites at the stage of subduction and the impact of SiO2-enriched melt/fluid of subduction genesis with peridotites of the lithospheric mantle.

 Ключевые слова кварц Cr-диопсид Cr-пироп литосферная мантия мантийный ксенолит мантийный метасоматоз субдукция кимберлит гранатовый пироксенит кратон Keywords quartz Cr-diopside Cr-pyrope lithospheric mantle mantle xenolith mantle metasomatism subduction kimberlite garnet pyroxenite craton Российский научный фонд, грант № 20-77-10018; Российский научный фонд, грант № 21-77-10006; государственное задание ИГМ СО РАН (№ 122041400157-9). Russian Science Foundation, grant No. 20-77-10018; Russian Science Foundation, grant No. 21-77-10006; state assignment of IGM SB RAS (№ 122041400157-9). Bose K., Ganguly J. Quartz-coesite transition revisited: Reversed experimental determination at 500-1200 °C and retrieved thermochemical properties // American Mineralogist. 1995. Vol. 80. P. 231-238. DOI: 10.2138/am-1995-3-404 Bose K., Ganguly J. Quartz-coesite transition revisited: Reversed experimental determination at 500-1200 °C and retrieved thermochemical properties. American Mineralogist. 1995. 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