gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2020-11-1-0469gtcrust-991Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSСУБДУКЦИОННЫЕ ЭКЛОГИТЫ БЕЛОМОРСКОЙ ЭКЛОГИТОВОЙ ПРОВИНЦИИ (ВОСТОК ФЕННОСКАНДИНАВСКОГО ЩИТА, РОССИЯ): МЕЗОАРХЕЙ, НЕОАРХЕЙ ИЛИ ПОЗДНИЙ ПАЛЕОПРОТЕРОЗОЙ?THE BELOMORIAN ECLOGITE PROVINCE (EASTERN FENNOSCANDIAN SHIELD, RUSSIA): MESO-NEOARCHEAN OR LATE PALEOPROTEROZOIC?https://orcid.org/0000-0001-7015-6586МинцМ. В.MintsM. V.

МИХАИЛ ВЕНИАМИНОВИЧ МИНЦ докт. геол.-мин. наук, зав. лабораторией

119017, Москва, Пыжевский пер., 7, Россия

MIKHAIL V. MINTS Doctor of Geology and Mineralogy, Head of Laboratory

7 Pyzhevsky Ln, Moscow 119017, Russia

michael-mints@yandex.ruhttps://orcid.org/0000-0002-1007-5909ДокукинаК. А.DokukinaK. A.

КСЕНИЯ АЛЕКСАНДРОВНА ДОКУКИНА канд. геол.-мин. наук, в.н.с.

119017, Москва, Пыжевский пер., 7, Россия

KSENIA A. DOKUKINA Candidate of Geology and Mineralogy, Leading Researcher

7 Pyzhevsky Ln, Moscow 119017, Russia

ksdokukina@gmail.comГеологический институт РАНРоссияGeological Institute of RASRussian Federation202019032020111151200Copyright © Минц М.В., Докукина К.А., 20202020Минц М.В., Докукина К.А.Mints M.V., Dokukina K.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.gt-crust.ru/jour/article/view/991

Критическое обсуждение конкурирующих моделей геодинамической природы (океанская иликонтинентальная субдукция) и возраста (мезонеоархей или поздний палеопротерозой) эклогитового метаморфизма ассоциации Салма в Беломорской эклогитовой провинции опирается на систематический анализ обширной базы данных, полученных сторонниками обеих моделей. Имеющиеся данные характеризуют геологическое строение ассоциации Салма и особенности цирконов из эклогитов: изотопно-геохронологические и геохимические параметры, состав и особенности распределения минеральных включений. Закономерные изменения трендов REE и температуры кристаллизации – рекристаллизации пористых цирконов в эклогитах-метагаббро иллюстрируют последовательность магматических и метаморфических событий в мезонеоархее и палеопротерозое. Восприимчивость к перекристаллизации цирконов обусловлена частичной метамиктностью и пористой структурой. Наиболее ранние (~2.9 млрд лет) зоны цирконов сохраняют тренды REE магматического типа. Микровключения минералов пренит-пумпеллиитовой и зеленосланцевой фации и рост концентраций LREE и MREE свидетельствуют о гидротермальном метаморфизме в зоне спрединга и на океанском дне 2.90–2.82 млрд лет назад. Пренит, пумпеллиит, альбит, актинолит, хлорит, диаспор и сапонит образуют включения также и вэклогитовом гранате. Увеличение концентраций LREE и MREE, исчезновение положительной Ce-аномалии, смена отрицательной на положительную аномалию Eu 2.82–2.78 млрд лет назад предполагают удаление плагио-клаза при образовании эклогитовой ассоциации «гранат + омфацит» и замещение сфена рутилом. На эклогитовыйметаморфизм указывают микровключения граната и рутила в цирконе. Неоархейский метаморфизм гранулитовой фации 2.77–2.70 млрд лет назад зафиксирован округло-овальными цирконами из эклогитов-метагабброноритов: температурами кристаллизации 700–900 °С и отрицательными аномалиями Eu в ядрах и каймах цирконов, которые указывают на участие плагиоклаза в процессе метаморфической кристаллизации. Поздние (2.1–1.7 млрд лет) каймы пористых цирконов, возникшие при 600–680 °С, отличаются минимальными концентрациями REE, сменой положительной на отрицательную аномалию Eu и появлением отрицательной Ce-аномалии, что указывает на присутствие плагиоклаза, восстановительный тип флюидов и низкую активность воды, характерную для высокотемпературного метаморфизма в обстановках растяжения и мантийно-плюмовой активности. Глубокая перестройка Sm-Nd системы пород Беломорской тектонической провинции, включая БЭП, ~1.9 млрд лет назад вызвана прогревом коры, который распространялся от границы с Лапландским гранулитовым поясом в ЗЮЗ направлении. Перестройка Lu-Hf системы в цирконе со значительным приростом радиогенного Hf указывает на перекристаллизацию длительно существовавшего граната, в котором к 1.9 млрд лет в результате распада 176Lu накопилось значительное количество радиогенного 176Hf. Это противоречит ранее выдвинутому предположению о первичной кристаллизации эклогитового граната в позднем палеопротерозое 1.94–1.89 млрд лет назад.

A critical discussion of competing models of the geodynamic nature (oceanic or continental subduction) and age (Meso-Neoarchean or Late Paleoproterozoic) of the eclogite facies metamorphism in the Belomorian eclogite province (BEP) is based on the systematic analysis of the sum of previously known and newly obtained data characterizing the geological structure of the Salma eclogite association and features of zircons from eclogites, including the isotopegeochronological and geochemical characteristics, composition and distribution of mineral inclusions. Regular changes in the REE trends and crystallization-recrystallization temperature of porous zircons in eclogite-metagabbro illustrate the sequence of magmatic and metamorphic events in the Meso-Neoarchean and Paleoproterozoic. The susceptibility to recrystallization of zircons is due to partial metamictness and porous structure. The earliest (~2.9 Ga) zircon zones retain mag-matic-type REE trends. The microinclusions of the prenite-pumpelliite and greenschist facies minerals and the increase in the LREE and MREE concentrations indicate hydrothermal metamorphism in the spreading ridge and on the ocean floor at 2.9–2.82 Ga. Prenite, pumpelliite, albite, actinolite, chlorite, diaspore and saponite also form inclusions in the eclogitic garnet. An increase of LREE and MREE, the disappearance of the Ce positive anomaly, a change from negative to positive Eu anomaly at 2.82–2.78 Ga indicate that plagioclase was removed during the formation of the ‘garnet + omphacite’ eclogite association and the replacement of sphene with rutile. The eclogite facies metamorphism linked with subduction of the oceanic crust is also indicated by the microinclusions of garnet and rutile in zircon. The crystallization temperature in 700–900 °C range of the round-oval zircons from eclogites-metagabbronorites records the Neoarchean granulite facies metamorphism at 2.77–2.70 Ga, the negative Eu anomalies in the cores and rims of zircons indicate the participation of plagioclase in the metamorphic crystallization. Late (2.1–1.7 Ga) rims of porous zircons that occurred at 600–680 °C are distinguished by minimal REE concentrations, a change from a positive Eu anomaly to a negative one, and the appearance of a negative Ce anomaly, which indicates the presence of plagioclase, reducing type of fluids and, accordingly, low water activity that is characteristic of high-temperature metamorphism under stretching condition and mantle-plume activity. The deep Sm-Nd system reworking in the Belomorian tectonic province, including BEP, at ~1.9 Ga was caused by the crustal heating that spread from the Lapland granulite belt border in the west-south-westward direction. The Lu-Hf system in zircon reworking with a significant increase in radiogenic Hf indicates the recrystallization of a long-existing garnet, in which a significant amount of radiogenic 176Hf accumulated by 1.9 Ga as a result of the 176Lu decay. This contradicts the earlier suggestion of the eclogite garnet primary crystallization in the late Paleoproterozoic (1.94–1.89 Ga).

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