Model of the Formation of Monzogabbrodiorite–Syenite–Granitoid Intrusions by the Example of the Akzhailau Massif (Eastern Kazakhstan)

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Petrology Pub Date : 2024-04-22 DOI:10.1134/S086959112402005X

P. D. Kotler, S. V. Khromykh, A. V. Zakharova, D. V. Semenova, A. V. Kulikova, A. G. Badretdinov, E. I. Mikheev, A. S. Volosov

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Abstract

This paper presents a model of the formation of a multiphase Akzhailau granitoid massif formed within a Caledonian block of the Earth’s crust in the Hercynian time. This work is based on the results of major and trace element composition, geochronological, mineralogical and isotope-geochemical studies. Three stages of the formation of the Akzhailau massif are distinguished, which differ significantly from the previously accepted concepts about the multicomplex and polychronous origin of this intrusion: (1) the formation of moderately alkaline A₂-type leuсogranites (308–301 Ma); (2) intrusion of monzodiorites into the base of leucogranites (~295 Ma), increasing degree of partial melting of protoliths with the formation of syenites and moderately alkaline granites of I-type (294–292 Ma); (3) intrusion of dikes and small bodies of alkaline ferroeckermannite A₁-type leucogranites in the west and north of massif (~289 Ma). The Akzhailau massif was formed within about 15 Myr in the middle–upper crust through the interaction of plume-related subalkaline basitic magmas with metamorphosed crustal protolith of the orogenic structure.

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以阿克扎伊劳地块（哈萨克斯坦东部）为例的蒙左闪长岩-闪长岩-花岗岩侵入体形成模型

本文介绍了在海西时代地壳喀里多尼亚区块内形成的多相阿克恰劳花岗岩块的形成模型。这项工作基于主要和微量元素组成、地质年代、矿物学和同位素地球化学研究的结果。阿克扎伊劳地块的形成分为三个阶段，与之前公认的关于该侵入体的多复合和多时间起源的概念大相径庭：(1) 形成中等碱性的 A2 型白花岗岩（308-301Ma）；(2) 单斜闪长岩侵入白花岗岩底部（约 295Ma），原岩部分熔化程度增加，形成正长岩和中等碱性的 I 型花岗岩（294-292Ma）；(3) 在地块西部和北部侵入尖晶岩和小块碱性铁长斑岩 A1 型白花岗岩（约 289 Ma）。阿克恰劳岩块是在中上地壳约 15 Myr 内，通过与羽状亚碱性玄武质岩浆与造山构造的变质地壳原岩相互作用而形成的。

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来源期刊

Petrology 地学-地球科学综合

CiteScore

2.40

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.