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

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2021-06-22 DOI:10.5800/gt-2021-12-2-0525

O. Udoratina, K. Kulikova, A. Shuyskiy, A. A. Sobolevа, V. Andreichev, I. Golubeva, V. A. Kapitanova

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引用次数: 2

Abstract

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.

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乌拉尔北部花岗岩类岩浆作用:U-Pb年龄、演化、来源

本文总结了近十年来乌拉尔北部(极地、亚极地和北乌拉尔)花岗岩类的U-Pb (SIMS, TIMS)锆石日期和岩石地球化学特征。花岗岩熔体是由不同基质的熔融形成的，在组成和年龄上高度不均匀，在研究区域的所有地球动力学阶段都是如此。前花岗岩类包括岛弧增生(735-720 Ma、670 Ma)、碰撞(650-520 Ma)和裂谷相关(520-480 Ma)花岗岩类。乌拉尔花岗岩包括原始岛弧花岗岩(460 ~ 429 Ma)、成熟岛弧花岗岩(412 ~ 368 Ma)、早期碰撞花岗岩(360 ~ 316 Ma)和晚期碰撞花岗岩(277 ~ 249 Ma)。结果及时识别出了氧(δ18OZrn，‰)、钕(εNd(t)wr)、铪(εHf(t)Zrn)同位素组成变化的总趋势。岛弧花岗岩(Preuralides)常见的地幔同位素组成(δ18OZrn (+5.6)， εNd(t)wr (+1.7)， εHf(t)Zrn(+8.7…+10.6))被碰撞花岗岩的典型壳幔同位素组成(δ18OZrn(+7.2…+8.5)，εNd(t)wr(-4.8…+1.8)，εHf(t)Zrn(+2.1 ~ +13))所改变。由此可见，地壳物质在后者的形成过程中起了重要作用。地壳-地幔同位素组成受地幔同位素组成的影响，具有裂谷相关(δ18OZrn(+4.7…+7)，εNd(t)wr(+0.7…+5.6)，εHf(t)Zrn(-2.04…+12.5))和岛弧(Uralides;δ18 ozrn(+ 4.2 + 5.7),εNd (t) wr(+ 4.1 + 7.4),ε高频(t) Zrn花岗岩类岩石(+ 12 + 15.2))。

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.