Geodynamics and Early Cretaceous Magmatism of the Northern Volcano-Plutonic Belt of Verkhoyan–Kolyma Fold Area (Northeastern Russia)

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-01-08 DOI:10.1134/s0016852123050059

M. V. Luchitskaya, M. V. Gertseva, I. V. Sysoyev

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Abstract

New data on the geological position, U‒Pb SIMS zircon ages, petrogeochemical features, Sr‒Nd isotopic composition, and geodynamic setting of the granitoids and volcanics of the Northern volcanic-plutonic belt of the Verkhoyan–Kolyma fold area are presented. Magmatic rocks of the belt include granitoids of Elikchan, Kuranakh, and Bakyn plutons, composed of Elikchan granite–granodiorite complex and volcanics of predominantly intermediate-felsic Tumusskaya sequence with subvolcanic bodies of the same composition. They form a single Early Cretaceous (127–121 Ma) volcanic-plutonic assemblage. Granitoid plutons are elongated in a sublatitudinal and northwestern direction and are discordant to main fold-and-thrust structures. Granitoids intrude and metamorphose Jurassic terrigenous and Early Cretaceous volcanics of Tumusskaya sequence and are intruded by younger Late Cretaceous subvolcanic bodies. Granitoids of Bakyn, Elikchan, and Kuranakh plutons combine petrogeochemical features of I-, S-, and A-type granites. Such diversity of petrogeochemical granitoid types, as well as interrelations of major (\({\text{F}}{{{\text{e}}}_{{\text{2}}}}{\text{O}}_{3}^{{{\text{tot}}}}\)–TiO₂–MgO) and rare (Ba/La–Nb × 5–Yb × 10) elements in granitoids and the same age volcanics of the Tumusskaya sequence, allow us to refer them to igneous rocks of transform or sliding plate boundaries. Collision between the Chukotka microcontinent and the Siberian continent with the earlier accreted Kolyma–Omolon microcontinent in Barremian–Aptian time changed to postcollisional extension and formation of volcanic-plutonic assemblage of the Northern volcanic-plutonic belt. Postcollisional extension took place at the transform or sliding plate boundaries. Sr–Nd isotopic characteristics of granitoids of all granite plutons indicate the interrelation of mantle and crustal sources of granitoid melts in this process.

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维尔霍扬-科雷马褶皱区北部火山-岩浆岩带（俄罗斯东北部）的地球动力学和白垩纪早期岩浆活动

摘要介绍了有关上霍扬-科雷马褶皱区北部火山-岩浆岩带的花岗岩和火山岩的地质位置、U-Pb SIMS 锆石年龄、岩石地球化学特征、Sr-Nd 同位素组成和地球动力学环境的新数据。该火山岩带的岩浆岩包括由埃利克昌花岗岩-花岗闪长岩复合体组成的埃利克昌、库拉纳赫和巴金柱状花岗岩，以及主要为中长岩的图穆斯卡亚序列火山岩和具有相同成分的亚火山岩体。它们构成了一个单一的早白垩世（127-121Ma）火山-岩浆组合。花岗岩柱状岩体在亚纵向和西北方向拉长，与主要的褶皱和推覆构造不协调。花岗岩侵入并变质了图穆斯卡娅序列的侏罗纪陆相火山岩和早白垩世火山岩，并被较年轻的晚白垩世次火山岩体侵入。Bakyn、Elikchan和Kuranakh岩体的花岗岩结合了I型、S型和A型花岗岩的岩石地球化学特征。花岗岩岩石地球化学类型的多样性，以及花岗岩中主要元素（({text{F}}{{text{e}}}_{text{2}}}}\{text{O}}_{3}}^{{text{tot}}}}\)-TiO2-MgO）和稀有元素（Ba/La-Nb × 5-Yb × 10）与图穆斯卡亚岩序同龄火山岩的相互关系，使我们可以将它们称为火成岩、因此，我们可以将它们归类为转换板块或滑动板块边界的火成岩。楚科奇微大陆和西伯利亚大陆与早先增生的科里马-奥莫伦微大陆在巴里米亚-安普顿时期发生碰撞，导致碰撞后延伸，形成了北部火山-板块带的火山-板块组合。碰撞后延伸发生在转换或滑动板块边界。所有花岗岩柱的花岗岩的Sr-Nd同位素特征表明，在这一过程中，花岗岩熔体的地幔和地壳来源相互关联。

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来源期刊

Geotectonics 地学-地球化学与地球物理

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.