gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-5-0850mfybcegtcrust-2109Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSБАРРЕМСКИЙ МАГМАТИЗМ СЕВЕРО-ЗАПАДА ТЫТЫЛЬВЕЕМСКОЙ ВПАДИНЫ (ЗАПАДНАЯ ЧУКОТКА)BARREMIAN MAGMATISM OF THE NORTHWEST OF THE TYTYLVEEM DEPRESSION (WESTERN CHUKOTKA)СвиринН. С.SvirinN. S.

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

Nikolay S. Svirin

7-1 Pyzhevsky Ln, Moscow 119017

nikolay.svirin@bk.ruВатрушкинаЕ. В.VatrushkinaE. V.

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

7-1 Pyzhevsky Ln, Moscow 119017

ЛучицкаяМ. В.LuchitskayaM. V.

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

7-1 Pyzhevsky Ln, Moscow 119017

Геологический институт РАНРоссияGeological Institute, Russian Academy of SciencesRussian Federation202517102025165850850Copyright © Свирин Н.С., Ватрушкина Е.В., Лучицкая М.В., 20252025Свирин Н.С., Ватрушкина Е.В., Лучицкая М.В.Svirin N.S., Vatrushkina E.V., Luchitskaya M.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/2109

В статье представлены новые данные об изотопном возрасте и химическом составе магматических комплексов северо-западной периферии Тытыльвеемской впадины Западной Чукотки. Полученные оценки возраста внедрения монцонитовых штоков чукотского комплекса (124±1 млн лет) и начала излияния покровных андезибазальтов тытыльвеемской свиты (124±1 млн лет) являются наиболее древними из известных датировок постколлизионного магматизма Чукотки. Гранитоиды чукотского комплекса датированы впервые. Долериты тытыльвеемского субвулканического комплекса отличаются от вмещающих их тытыльвеемских вулканитов низкой магнезиальностью, повышенным содержанием калия и принадлежностью к окисленной магнетитовой серии. Монцониты чукотского комплекса и субвулканические долериты имеют в источнике более высокую долю деплетированного мантийного компонента, чем молодые породы (122–117 млн лет) Тытыльвеемского вулканоплутонического пояса. Минералого-геохимические характеристики монцонитов могут свидетельствовать о принадлежности магматитов чукотского комплекса к ядру порфирово-эпитермальной системы, частью которой являются месторождения Двойное и Сентябрьское.

The article presents new data on the isotopic geochronology and geochemistry of magmatic complexes on the northwestern periphery of the Tytylveem Depression, Western Chukotka. U-Pb ages obtained for the emplacement of monzonite stocks of the Chukotka complex (124±1 Ma) and for the onset of effusive activity associated with the flood basaltic andesites of the Tytylveem formation (124±1 Ma) are the oldest known ages of post-collisional magmatism within the Chukotka region. Granitoids of the Chukotka complex are dated for the first time. Dolerites of the Tytylveem subvolcanic complex differ from the host Tytylveem volcanic rocks by lower MgO, higher K contents, and affilation with the oxidized magnetite series. Monzonites of the Chukotka complex and subvolcanic dolerites derive from sources with a higher proportion of depleted mantle component then the younger (122–117 Ma) rocks of the Tytylveem volcano-plutonic belt. Mineralogical and geochemical characteristics of the monzonites indicate that the Chukotka complex magmatic rocks may belong to the core of a porphyry epithermal system that includes the Dvoinoye and Sentyabrskoye deposits.

Тытыльвеемский вулканоплутонический поясU-Pb датированиепостколлизионный магматизм Западной ЧукоткиTytylveem volcano-plutonic beltU-Pb datingpostcollisional magmatism of Western ChukotkaИсследование проведено в рамках госзадания ГИН РАН (тема № FMMG-2024-0001).The study was carried out on the state assignment of the GIN RAS (topic No. FMMG-2024-0001).ReferencesAkinin V.V., Andronikov A.V., Mukasa S.B., Miller E.L., 2013. Cretaceous Lower Crust of the Continental Margins of the Northern Pacific: Petrological and Geochronological Data on Lower to Middle Crustal Xenoliths. Petrology 21 (1), 28-65. https://doi.org/10.1134/S0869591113010013.Akinin V.V., Andronikov A.V., Mukasa S.B., Miller E.L., 2013. Cretaceous Lower Crust of the Continental Margins of the Northern Pacific: Petrological and Geochronological Data on Lower to Middle Crustal Xenoliths. Petrology 21 (1), 28-65. https://doi.org/10.1134/S0869591113010013.Akinin V.V., Polzunenkov G.O., Gottlieb E.S., Miller E.L., 2022. 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The authors declare that there are no conflicts of interest present.