gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2021-12-3-0544gtcrust-1245Research ArticleДИСКУССИЯDISCUSSIONКОММЕНТАРИИ К СТАТЬЕ М.В. МИНЦА И К.А. ДОКУКИНОЙ «СУБДУКЦИОННЫЕ ЭКЛОГИТЫ БЕЛОМОРСКОЙ ЭКЛОГИТОВОЙ ПРОВИНЦИИ (ВОСТОК ФЕННОСКАНДИНАВСКОГО ЩИТА, РОССИЯ): МЕЗОАРХЕЙ, НЕОАРХЕЙ ИЛИ ПОЗДНИЙ ПАЛЕОПРОТЕРОЗОЙ?»COMMENTS ON THE ARTICLE AUTHORED BY M.V. MINTS AND K.A. DOKUKINA – THE BELOMORIAN ECLOGITE PROVINCE (EASTERN FENNOSCANDIAN SHIELD, RUSSIA): MESO-NEOARCHEAN OR LATE PALEOPROTEROZOIC?СкубловС. Г.SkublovS. G.

199034, Санкт-Петербург, наб. Макарова, 2

199106, Санкт-Петербург, 21 линия, 2

2 Makarov Emb, Saint Petersburg 199034

2, 21st Line, Saint Petersburg 199106

skublov@yandex.ruБерезинА. В.BerezinA. V.

199034, Санкт-Петербург, наб. Макарова, 2

199034, Санкт-Петербург, наб. Университетская, 7/9

2 Makarov Emb, Saint Petersburg 199034

7/9 Universitetskaya Emb, Saint Petersburg 199034

СалимгараеваЛ. И.SalimgaraevaL. I.

199034, Санкт-Петербург, наб. Макарова, 2

199106, Санкт-Петербург, 21 линия, 2

2 Makarov Emb, Saint Petersburg 199034

2, 21st Line, Saint Petersburg 199106

Институт геологии и геохронологии докембрия РАН; Санкт-Петербургский горный университетРоссияInstitute of Precambrian Geology and Geochronology RAS; Saint Petersburg Mining UniversityRussian FederationИнститут геологии и геохронологии докембрия РАН; Санкт-Петербургский государственный университетРоссияInstitute of Precambrian Geology and Geochronology RAS; Saint Petersburg UniversityRussian Federation202117092021123652661Copyright © Скублов С.Г., Березин А.В., Салимгараева Л.И., 20212021Скублов С.Г., Березин А.В., Салимгараева Л.И.Skublov S.G., Berezin A.V., Salimgaraeva L.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/1245

Работа представляет собой критические комментарии к статье М.В. Минца и К.А. Докукиной «Субдукционные эклогиты Беломорской эклогитовой провинции (восток Фенноскандинавского щита, Россия): мезоархей, неоархей или поздний палеопротерозой?» (Geodynamics & Tectonophysics. 2020. 11 (1), 151–200). Беломорская провинция Фенноскандинавского щита – ключевой пункт в исследованиях ранней тектоники, поскольку с ней связаны многочисленные находки докембрийских эклогитов. Проблема возраста эклогитового метаморфизма габброидов Беломорского подвижного пояса неожиданно оказалась крайне актуальной не только для геологии данного региона, но и для докембрийской геологии в целом, поскольку определения рядом авторов возраста эклогитов как архейского (2.7–2.8 млрд лет) делают Беломорский подвижный пояс единственным в мире примером архейского эклогитового метаморфизма и, следовательно, единственным продатированным свидетельством в пользу плейт-тектонической модели эволюции земной коры на самом раннем этапе ее становления.

В статье последовательно проведен критический разбор аргументов, выдвигаемых сторонниками архейского возраста эклогитов Беломорского подвижного пояса. Специальный акцент в работе сделан на изотопно-геохронологических и геохимических особенностях состава циркона из эклогитов, а также на особенностях фазового и химического состава и характера распределения минеральных включений. Авторская трактовка возраста эклогитового метаморфизма, приведшего к образованию эклогитов Беломорского подвижного пояса, основанная на комплексе независимых изотопно-геохимических методов датирования – локальном U-Pb методе по гетерогенным цирконам с магматическими ядрами и эклогитовыми каймами, Lu-Hf и Sm-Nd методах по минералам эклогитового парагенезиса – гранату и омфациту, принципиально другая, чем в рассматриваемой статье: все три метода независимо друг от друга определяют эклогитовый метаморфизм как палеопротерозойский, с одним и тем же значением возраста – около 1.9 млрд лет. По нашим данным, эклогиты Беломорского подвижного пояса являются одними из самых древних высокобарических пород с достоверно установленным возрастом метаморфизма около 1.9 млрд лет при различном возрасте магматического протолита в интервале от 2.2 до 2.9 млрд лет.

The comments are given on the article authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic? (Geodynamics & Tectonophysics 2020, 11 (1), 151–200). The Belomorian (White Sea) province of the Fennoscandia Shield is a key site for studying the tectonics of the early periods because numerous Precambrian eclogites have been found there. It was not anticipated, but the problem of age determinations of the eclogite metamorphism of gabbroids in the White Sea mobile belt has turned out to be extremely relevant not only for this region, but also for the Precambrian geology in general. The reason is that a number of authors determine the age of eclogites as Archean (2.7–2.8 Ga), which makes the White Sea mobile belt the only example of the Archean eclogite metamorphism in the world and, therefore, the only dated evidence in support of the plate tectonic model of the evolution of the Earth’s crust at the earliest stage of its formation. The article consistently provides a critical analysis of the arguments put forward by the supporters of the Archean age of the eclogites of the White Sea mobile belt. Special emphasis is made on the isotope geochronological and geochemical features of the composition of zircons from eclogite samples, as well as on the phase and chemical compositions and distribution patterns of mineral inclusions. Considering the age of eclogite metamorphism that led to the formation of eclogites in the White Sea mobile belt, we propose our interpretation based on a set of independent isotope geochemical dating methods, including the local U- Pb method for heterogeneous zircons with magmatic cores and eclogite rims, the Lu-Hf and Sm-Nd methods for the minerals of eclogite paragenesis (garnet and omphacite). And this age interpretation is fundamentally different from the one described in the commented article: all the three methods independently determine the eclogite metamorphism as Paleoproterozoic and yield the same age of circa 1.9 Ga. According to our data, the eclogites of the White Sea mobile belt are among the most ancient high-pressure rocks, their reliably established age of metamorphism is circa 1.9 Ga, and the age of the magmatic protolith is the range of 2.2–2.9 Ga.

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