gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-3-0636gtcrust-1528Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSГЕОХИМИЧЕСКИЕ МЕТКИ СОВМЕСТНОЙ СТРУКТУРНО-ВЕЩЕСТВЕННОЙ ЭВОЛЮЦИИ ЧЕХЛА И ФУНДАМЕНТА (СВЕКОФЕННИДЫ СЕВЕРНОГО ПРИЛАДОЖЬЯ, РОССИЯ)GEOCHEMICAL MARKERS OF THE JOINT STRUCTURAL AND COMPOSITIONAL EVOLUTION OF THE BASEMENT AND COVER (NORTHERN LADOGA SWECOFENNIDES, RUSSIA)МорозовЮ. А.MorozovYu. A.

123242, Москва, ул. Большая Грузинская, 10, стр. 1, Россия 

 10-1 Bolshaya Gruzinskaya St, Moscow 123242, Russia 

ТереховЕ. Н.TerekhovE. N.

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

 7-1 Pyzhevsky Ln, Moscow 119017, Russia 

МатвеевМ. А.MatveevM. A.

123242, Москва, ул. Большая Грузинская, 10, стр. 1, Россия 

 10-1 Bolshaya Gruzinskaya St, Moscow 123242, Russia 

matveevmaksim93@mail.ruОкинаО. И.OkinaO. I.

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

 7-1 Pyzhevsky Ln, Moscow 119017, Russia 

Институт физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian FederationГеологический институт РАНРоссияGeological Institute, Russian Academy of SciencesRussian Federation202219092022133636636Copyright © Морозов Ю.А., Терехов Е.Н., Матвеев М.А., Окина О.И., 20222022Морозов Ю.А., Терехов Е.Н., Матвеев М.А., Окина О.И.Morozov Y.A., Terekhov E.N., Matveev M.A., Okina O.I.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/1528

Детальные исследования глубокометаморфизованных раннедокембрийских пород Северного Приладожья позволили выделить три этапа деформаций эпохи свекофеннского тектогенеза, в ходе которых произошли существенные структурно-вещественные преобразования системы «чехол (палеопротерозой) – фундамент (архей)». Помимо проведенного структурно-парагенетического анализа, позволившего выделять «сквозные» структурные парагенезы в обоих этажах, дополнительные возможности открываются при выделении вписанных в них гранитоидных жильных образований c выявленной положительной Eu-аномалией. Разности, имеющие эту аномалию, всегда обогащены барием и не показывают прямую корреляцию величины Eu-аномалии с (La/Yb)n, Ca и Sr. Это противоречит представлениям о причинах появления положительной Eu-аномалии за счет замещения двухвалентного стронция Eu++ и позволяет предположить, что формирование подобных пород происходило под влиянием глубинных восстановленных флюидов. Установлено, что гранитоиды с положительной Eu-аномалией формировались на первом и заключительном этапах эволюции структуры, когда преобладали хрупкие деформации и происходил прорыв глубинных восстановленных флюидов. На втором этапе, с доминирующим проявлением пластических деформаций, когда могла происходить «закупорка» таких флюидов внутри системы, формировались гранитоиды с низкими концентрациями бария и отрицательной Eu-аномалией.

Detailed studies of the deeply metamorphosed Early Precambrian rocks of the Northern Ladoga region allowed us to distinguish three deformation stages of the Svecofennian tectogenesis during which there occurred significant structural and compositional transformations of the "cover (Paleoproterozoic) – basement (Archean)" system. In addition to the structural-paragenetic analysis, which allowed to allocate transversal structural paragenesis in both floors, there are some other opportunities in the recognition of their-hosted granitoid veined bodies with a positive Eu anomaly. The rock varieties with this anomaly are always high in barium and do not show a direct correlation between the Eu anomaly and (La/Yb)n, Ca and Sr. This is contrary to the ideas about the occurrence of a positive Eu anomaly due to the substitution of divalent strontium by Eu++ and suggests that the formation of such rocks took place under the influence of deep reduced fluids. It was found that granitoids with a positive Eu anomaly were formed during the first and last stages of the structure evolution, with a predominance of brittle deformations and a deep-reduced fluid breakthrough. At the second stage, with the dominant manifestation of plastic deformations, when such fluids could be "blocked" within the system, there was a formation of granitoids with low barium concentrations and a negative Eu anomaly.

Северное Приладожьетектонические деформацииметаморфизмгеохимиягранитоидысвекофеннский тектогенезEu-аномалияэволюция платформыNorthern Ladoga regiontectonic deformationsmetamorphismgeochemistrySvecofennian tectogenesisgranitoidsEu anomalyplatform evolutionРабота выполнена в рамках исследований по государственному заданию ИФЗ РАН (в части вопросов взаимодействия эндогенных процессов при формировании континентальной земной коры), в соответствии с планами фундаментальных исследований ГИН РАН и по гранту РФФИ № 19-05-00256 (в части аспектов метаморфогенного структурообразования в системе «чехол – фундамент»).The study was carried out under the state assignments of the Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, (for matters relating to the interaction of endogenous processes during the formation of the continental crust), in accordance with the plans for fundamental research of the Geological Institute Russian Academy of Sciences and with a financial support by the Russian Foundation for Basic Research under grant 19-05-00256 (for matters relating to synmetamorphic formation of structures in the "basement – cover" system).ReferencesArt J.G., Barker F., Peterman Z.E., Friedman I., 1978. 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The authors declare that there are no conflicts of interest present.