litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/2500-302X-2026-26-3-540-564AWBQTElitosphere-2527Research ArticleСтатьиArticlesМафит-ультрамафитовые субдукционные комплексы Беломорской эклогитовой провинции: состав и условия формированияMafic-Ultramafic Subduction Complexes of the Belomorian Eclogite Province: Composition and Formation ConditionsДокукинаК. А.DokukinaK. A.

119017,; Пыжевский пер, 7, стр. 1; Москва

Ksenia A. Dokukina

119017; 7/1 Pyzhevsky lane; Moscow

dokukina@mail.ruПожиленкоВ. И.PozhilenkoV. I.

184209; ул. Ферсмана, 14; Мурманская обл.; Апатиты

Vladimir I. Pozhilenko

184209; 14 Fersman st.; Murmansk Region; Apatity

КунаккузинЕ. Л.KunakkuzinE. L.

184209; ул. Ферсмана, 14; Мурманская обл.; Апатиты

Evgeny L. Kunakkuzin

184209; 14 Fersman st.; Murmansk Region; Apatity

КониловА. Н.KonilovA. N.

119017; Пыжевский пер, 7, стр. 1; Москва

Alexander N. Konilov

119017; 7/1 Pyzhevsky lane; Moscow

КомпанченкоА. А.KompanchenkoA. A.

184209; ул. Ферсмана, 14; Мурманская обл.; Апатиты

Alena A. Kompanchenko

184209; 14 Fersman st.; Murmansk Region; Apatity

Геологический институт РАНРоссияGeological Institute, RASRussian FederationГеологический институт, ФИЦ “Кольский научный центр” РАНРоссияGeological Institute, Federal Research Center “Kola Science Center”, RASRussian Federation202619072026263540564Copyright © Докукина К.А., Пожиленко В.И., Кунаккузин Е.Л., Конилов А.Н., Компанченко А.А., 20262026Докукина К.А., Пожиленко В.И., Кунаккузин Е.Л., Конилов А.Н., Компанченко А.А.Dokukina K.A., Pozhilenko V.I., Kunakkuzin E.L., Konilov A.N., Kompanchenko A.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/2527   Объект исследования

   Объект исследования. Ассоциация метаморфических пород Салмы (Беломорская эклогитовая провинция (БЭП), Фенноскандинавский щит Восточно-Европейского кратона) представляет собой проявление единого мезо-неоархейского субдукционно-аккреционного комплекса активной континентальной окраины Кольского палеоконтинента.

   Цель

   Цель. Исследовать генетические связи между эклогитами, метаперидотитами, продуктами плавления эклогитов в зоне субдукции и вмещающими эти породы тоналит-трондьемит-гранодиоритовыми (ТТГ) гнейсами.

   Общие положения

   Общие положения. Представлено обобщение по породам мезо-неоархейской зоны океанической палеосубдукции под активную континентальную окраину Кольского палеоконтинента. Работа включает как литературные, так и новых петрологические и геохимические данные. Эклогиты: субдукционные эклогиты БЭП локализованы внутри ТТГ гнейсов и имеют дифференцированные составы протолитов океанической коры (от N-MORB до E-MORB). Эклогиты сохраняют следы прогрессивной эволюции океанической коры: от ее формирования в медленноспрединговом центре и низкотемпературного преобразования на морском дне до субдукции в мантию на глубины более 70 км. Адакиты и андезиты. Адакитовые лейкосомы в эклогитах и адакитовые гнейсы указывают на частичное плавление относительно молодой эклогитизированной океанической коры на глубинах > 70 км и температурах > 750 °C. Значительные объемы андезитовых магм, вероятно, возникли при плавлении мантийного клина, метасоматизированного надсубдукционными флюидами. Как андезитовый, так и адакитовый надсубдукционный магматизм способствовали росту континентальной окраины.

   Метаперидотиты

   Метаперидотиты. В эклогитах встречаются ультрамафиты: серпентиниты, тальковые сланцы, карбонатсодержащие хлоритовые гарцбургиты со слоями и жилами гранатовых пироксенитов. Метаперидотиты образовались в результате низкотемпературной гидратации абиссальных мантийных перидотитов в медленноспрединговом океаническом хребте или в зоне изгиба плиты у глубоководного желоба, что привело к их превращению в серпентиниты. Крупные фрагменты серпентинитов были тектонически внедрены в субдуцирующую плиту. Хлоритовые гарцбургиты сформировались за счет частичной дегидратации серпентинитов на глубине > 30 км и температурах ≈ 650 °C. На глубинах > 70 км и температурах > 750°C мантийные породы взаимодействовали с расплавами, отделявшимися от слэба, образуя прослои и жилы гранатовых пироксенитов вебстеритового состава.

   Выводы

   Выводы. Исследованные в Беломорской эклогитовой провинции породы фиксируют полный цикл эволюции океанической литосферы (кора и мантия) в архейской зоне субдукции и синхронное формирование активной окраины Кольского палеоконтинента. Породы, описанные в статье, отражают ключевые этапы этого процесса.

   Research subject

   Research subject. The Salma metamorphic rock association (Belomorian Eclogite Province (BEP), Fennoscandian Shield, East European Craton) represents a manifestation of a single Meso-Neoarchean subduction-accretion complex of the active continental margin of the Kola paleocontinent.

   Aim

   Aim. To investigate genetic relationships between eclogites, metaperidotites, products of eclogite melting in the subduction zone, as well as the tonalite-trondhjemite-granodiorite (TTG) gneisses that host these rocks.

   Key points

   Key points. Information on the rocks of the Meso-Neoarchean oceanic paleosubduction zone beneath the active continental margin of the Kola paleocontinent is reviewed and generalized. The work compiles both published and new petrological and geochemical data. Eclogites. Salma subduction eclogites of Salma in the BEP are localized within TTG gneisses and have variable protolith compositions of oceanic crust ranging from N-MORB to E-MORB. The eclogites preserve a record of prograde evolution of the oceanic crust, from formation in a slow-spreading center and low-temperature seafloor alteration to subduction into the mantle to depths >70 km. Adakites and andesites. Adakitic leucosomes in eclogites and adakitic gneisses indicate partial melting of relatively young eclogitized oceanic crust in the subduction zone at depths > 70 km and temperatures > 750 °C. Large volumes of andesitic magmas probably originated from the melting of the mantle wedge metasomatized by supra-subduction fluids. Both adakitic and andesitic supra-subduction magmatism contributed to the growth of the continental margin.

   Metaperidotites

   Metaperidotites. The eclogites contain magnesian ultramafic rocks, including serpentinites, talc schists, carbonate-bearing chlorite harzburgites with layers and veins of garnet pyroxenites. Metaperidotites formed by low-temperature hydration of abyssal mantle peridotites in a slow-spreading oceanic ridge or in the plate-bending zone near a deep-sea trench, which transformed them into serpentinites. Large serpentinite fragments were tectonically incorporated into the subducting plate. Chlorite harzburgites resulted from partial dehydration of serpentinites at depths >30 km and temperatures of ≈ 650 °C. At depths > 70 km and temperatures > 750°C, mantle rocks interacted with slab-derived melts, forming layers and veins of garnet pyroxenites of websteritic composition.

   Conclusions

   Conclusions. The rocks studied in the Belomorian Eclogite Province record a complete cycle of oceanic lithosphere evolution (crust and mantle) in an Archean subduction zone and the synchronous formation of an active margin of the Kola paleocontinent. The rocks described in the paper reflect key stages of this process.

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