Granitoid Magmatism of the Joint Area between the Severnyi and Glavnyi Batholith Belts of the Verkhoyan–Kolyma Fold Area

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-06-20 DOI:10.1134/s1028334x24602645

M. V. Luchitskaya, M. V. Gertseva, S. D. Sokolov, I. V. Sysoyev

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Abstract

New U–Th–Pb (SIMS)–geochronological, petro-geochemical, and Sr–Nd isotopic data for granitoids of three plutonic complexes (Sakhani, Omchikanda, and Arga–Emneken), located in the joint area of the two large batholih belts of the Verkhoyan–Kolyma fold area, Glavnyi and Severnyi, are presented. The Valanginian–Hauterivian age of the granitoids of all three complexes is established. The similarity of the granites and leucogranites of the Omchikanda and Sakhani complexes to the I–S-type granites and the similarity of the Arga–Emneken granitoids to the I-type granites are shown. The petro-geochemical peculiarities of the granitoid composition indicate a metasedimentary source for the granites and leucogranites of the Omchikanda and Sakhani complexes and a metamagmatic (amphibolitic) source for granitoids of the Arga–Emneken Complex. Sr–Nd isotopic data show that the granitoids were melted from different crustal sources, in which there are various proportions of mature material of the continental crust. The totality of geological and newly obtained geochronological, petro-geochemical, and isotopic data allow us to suppose a collisional setting of their formation in the terminal Valanginian–Hauterivian stage of collision between the Kolyma–Omolon microcontinent and the Siberian continent.

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上霍扬-科雷马褶皱区塞维利亚岩带和格拉夫尼岩带联合区域的花岗岩岩浆活动

摘要介绍了位于上霍扬-科里马褶皱区格拉夫尼和塞韦尔尼两个大熔岩带联合地区的三个岩浆复合体（萨哈尼、奥姆奇坎达和阿尔加-埃姆内肯）花岗岩的新 U-Th-Pb（SIMS）-测震学、岩石地球化学和 Sr-Nd 同位素数据。确定了所有三个复合体的花岗岩的瓦朗基元-豪特里维时代。奥姆奇坎达和萨哈尼岩群的花岗岩和白花岗岩与 I-S 型花岗岩相似，阿尔加-埃姆尼肯花岗岩与 I 型花岗岩相似。花岗岩成分的岩石地球化学特征表明，奥姆奇坎达和萨卡尼岩群的花岗岩和白花岗岩来源于变质岩，而阿尔加-埃姆内肯岩群的花岗岩来源于变质岩（闪长岩）。钍钕同位素数据表明，花岗岩是从不同的地壳源熔化而成的，其中大陆地壳成熟物质的比例各不相同。综合地质学和新获得的地质年代、岩石地球化学和同位素数据，我们可以推测这些花岗岩形成于科里马-奥莫隆微大陆与西伯利亚大陆碰撞的瓦朗基尼期-豪特里维期末期。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.