GRANITOID MAGMATISM IN THE NORTH OF THE URALS: U–Pb AGE, EVOLUTION, SOURCES

This work presents the summarization of U–Pb (SIMS, TIMS) zircon dates and petrogeochemical signatures of granitoids of the north of the Urals (Polar, Subpolar, and Northern Urals) obtained over the last decade. Granitе melts were formed from melting of different substrates, highly heterogeneous in...

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Published in:Frontiers in Earth Science
Main Authors: O. V. Udoratina, K. V. Kulikova, A. S. Shuyskiy, A. A. Sobolevа, V. L. Andreichev, I. I. Golubeva, V. A. Kapitanova, О. В. Удоратина, К. В. Куликова, А. С. Шуйский, А. А. Соболева, В. Л. Андреичев, И. И. Голубева, В. А. Капитанова
Other Authors: The studies were started as part of the projects 09-С-5-1017, 12-С-5-1024 (O.V. Udoratina), 15-18-5-40 (V.L. Andreichev), 15-18-5-57, 18-5-5-46 (K.V. Kulikova), and also received under the Agreement on Scientific Collaboration of 12.12.2008 and 15.01.2012 with the Department of Geology and Environmental Sciences, School of Earth, Stanford University (USA, E. Miller). At present, they are continuing within the framework of the state task of the Institute of Geology of Komi Science Center of the Ural Branch of the Russian Academy of Sciences (project No AAAA-A17-117121270035-0) and are partially financially supported by the Government of the Russian Federation (project No 14.Y26.31.0012, R. Ernst)., Исследования были начаты в рамках проектов 09-С-5-1017, 12-С-5-1024 (О.В. Удоратина), 15-18-5-40 (В.Л. Андреичев), 15-18-5-57, 18-5-5-46 (К.В. Куликова), также использованы данные, полученные в рамках Соглашения о научном сотрудничестве от 12.12.2008 г. и 15.01.2012 г. с Департаментом геологии и экологических наук Школы наук о Земле Стэнфордского университета (США, Э. Миллер). В настоящее время они продолжаются в рамках государственного задания Института геологии им. Н.П. Юшкина Коми НЦ УрО РАН ГР AAAA-A17- 117121270035-0 и частично поддерживаются Правительством Российской Федерации (проект 14.Y26.31.0012, Р. Эрнст).
Format: Article in Journal/Newspaper
Language:English
Published: Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch 2021
Subjects:
O
Online Access:https://www.gt-crust.ru/jour/article/view/1211
https://doi.org/10.5800/GT-2021-12-2-0525
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Summary:This work presents the summarization of U–Pb (SIMS, TIMS) zircon dates and petrogeochemical signatures of granitoids of the north of the Urals (Polar, Subpolar, and Northern Urals) obtained over the last decade. Granitе melts were formed from melting of different substrates, highly heterogeneous in composition and age, at all geodynamic stages distinguished in the studied area. Preuralides include island arc–accretionary (735–720 Ma, 670 Ma), collisional (650–520 Ma), and rift-related (520–480 Ma) granitoids. Uralides includes primitive island-arc granitoids (460–429 Ma), mature island-arc granitoids (412–368 Ma), early collisional (360–316 Ma) and late collisional (277–249 Ma) granitoids. As a result, the general trend of variations of oxygen (δ18OZrn, ‰), neodymium (εNd(t)wr), and hafnium (εHf(t)Zrn) isotope compositions identified in time. Mantle isotope compositions (δ18OZrn (+5.6), εNd(t)wr (+1.7), εHf(t)Zrn (+8.7.+10.6)), common for island arc granitoids (Preuralides) are changed by crustal–mantle ones (δ18OZrn (+7.2.+8.5), εNd(t)wr (–4.8.+1.8), εHf(t)Zrn (+2.1 to +13)), typical of collisional granites. According to this, the crustal matter played a significant role during the formation of the latter. The crustal-mantle isotope compositions are changed by the mantle ones, characteristic of rift-related (δ18OZrn (+4.7.+7), εNd(t)wr (+0.7.+5.6), εHf(t)Zrn (–2.04.+12.5)) and island-arc (Uralides; δ18OZrn (+4.2.+5.7), εNd(t)wr (+4.1.+7.4), εHf(t)Zrn (+12.+15.2)) granitoids. Проведено обобщение полученных в последнее десятилетие U-Pb цирконовых возрастов (SIMS, TIMS) и петрогеохимических характеристик гранитоидов севера Урала (Полярный, Приполярный и Северный Урал). Гранитные расплавы формировались на всех выделенных для этого региона геодинамических стадиях из крайне неоднородных по составу и возрасту субстратов. Доуралиды: островодужные примитивной островной дуги (735–720 млн лет), аккреционные (670 млн лет), коллизионные (650–520 млн лет), рифтогенные (520–480 млн лет). Уралиды: островодужные примитивной ...