gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-5-0844doovjrgtcrust-2103Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSВЛИЯНИЕ МОЩНОСТИ ОКЕАНИЧЕСКОЙ КОРЫ НА СТИЛЬ СУБДУКЦИИ В РАННЕМ ДОКЕМБРИИ ПО РЕЗУЛЬТАТАМ ЧИСЛЕННОГО ПЕТРОЛОГО-ТЕРМОМЕХАНИЧЕСКОГО МОДЕЛИРОВАНИЯTHE EARLY PRECAMBRIAN EFFECT OF OCEANIC CRUSTAL THICKNESS ON THE SUBDUCTION STYLE OBTAINED BY NUMERICAL PETROLOGICAL AND THERMOMECHANICAL MODELINGЗахаровВ. С.ZakharovV. S.

119991, Москва, Ленинские горы, 1

Vladimir S. Zakharov

1 Leninskie Gory, Moscow 119991

zakharov@geol.msu.ruПерчукА. Л.PerchukA. L.

119991, Москва, Ленинские горы, 1; 142432, Черноголовка, ул. Академика Осипьяна, 4

1 Leninskie Gory, Moscow 119991; 4, Academician Osipyan St, Chernogolovka 142432

ГеряТ. В.GeryaT. V.

8092, Цюрих, 5, Зоннеггштрассе

5, Sonneggstrasse, 8092 Zurich, Switzerland

Московский государственный университет им. М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian FederationМосковский государственный университет им. М.В. Ломоносова; Институт экспериментальной минералогии им. академика Д.С. Коржинского РАНРоссияLomonosov Moscow State University; Academician Korzhinsky Institute for Experimental Mineralogy, Russian Academy of SciencesRussian FederationШвейцарская высшая техническая школа ЦюрихаШвейцарияSwiss Federal Institute of TechnologySwitzerland202517102025165844844Copyright © Захаров В.С., Перчук А.Л., Геря Т.В., 20252025Захаров В.С., Перчук А.Л., Геря Т.В.Zakharov V.S., Perchuk A.L., Gerya T.V.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/2103

Эклогитизация магматических пород океанической коры играет ключевую роль в механизме движения литосферных плит. Этот эффект (как и его кинетическая задержка) особенно важен в докембрийской субдукции, когда мощность океанической коры могла в несколько раз превышать современную. В данной работе приводятся результаты численного моделирования субдукции под континент при повышенной (на ΔT=150–250 °C относительно современной) потенциальной температуре мантии, отвечающей раннему докембрию, с разной мощностью океанической коры, в которых учитывается дискретная эклогитизация пород ее базальтового и габброидного слоев, а также деплетирование мантии. Моделирование впервые показало, что мощность океанической коры оказывает существенное влияние на режим докембрийской субдукции. Для моделей с толстой корой (18–24 км) при всех значениях ΔT наблюдается пологая субдукция. Для моделей с тонкой корой (7 км) пологая субдукция отмечается лишь при ΔT=250 °C, тогда как при ΔT=150–200 °C пологое погружение происходит только на начальных этапах субдукции, а затем реализуется стиль крутой субдукции, сопровождающейся откатом слэба и магматизмом на активной окраине с преобладанием кислого магматизма над базитовым. На основе этих данных предполагается, что зоны с современным стилем крутой субдукции (или близким к нему) могли возникать в раннем докембрии там, где погружались плиты с маломощной (близкой к современной) океанической корой.

Eclogitization of magmatic rocks in the oceanic crust plays a key role in the mechanism of the lithospheric plate movement. This effect (as well as its kinetic delay) is particularly important in the Precambrian subduction when oceanic crust could be several times thicker than today. This paper presents the results of numerical modeling of the Early Precambrian subduction beneath the continent, at elevated (by ΔT=150–250 °C relative to today’s) mantle potential temperature and different oceanic crustal thicknesses, based on discrete eclogitization of the rocks in the oceanic-crust basaltic and gabbroid layers, as well as on mantle depletion. The modeling has shown for the first time that the oceanic crustal thickness has a profound effect on the Precambrian subduction regime. The thick-crust (18–24 km) models exhibit flat subduction at all values of ΔT. The thin-crust (7 km) models show flat subduction only at ΔT=250 °C, whereas at ΔT=150–200 °C flat subduction is typical only for subduction initiation with a further flat to steep transition in subduction style, accompanied by processes of slab rollback and magmatism at an active margin with the dominance of acid magmatism over basite magmatism. These data imply that the present-day steep (or steep-like) subduction zones could occur in the Early Precambrian where the plates with thin (like today) oceanic crust were subducting.

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