AGE OF THE AMNUNAKTA MONZOGABBRO-MONZODIORITE MASSIF IN THE SOUTHERN FRAMING OF THE SIBERIAN CRATON

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2020-06-20 DOI:10.5800/gt-2020-11-2-0475

I. V. Buchko, A. Rodionov, E. Salnikova

引用次数: 0

Abstract

. The first geochronological data have been obtained for Amnunakta massif composed of monzogabbro-monzodiorite and located in the southeastern part of the Selenga-Stanovoy superterrane. It was found that the age of Amnunakta massif (240 ± 1 Ma) is almost similar to that of quartz porphyry of the Kuitun formation and alkaline granites of the Nerchugan complex, which were sampled from the eastern flank of the Selenga-Vitim Volcano-Plutonic belt. Taking into account the geological position and geochemical features of the Amnunakta massif, there are grounds to suggest that the formation of this massif (as well as of quartz porphyry of the Kuitun formation and alkaline granites of the Nerchugan complex) was associated with one of the impulses of bimodal intraplate magmatism during the evolution of the Selenga-Vitim belt.

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西伯利亚克拉通南构造中的二长辉长-二黄道长地块时代

． Amnunakta地块位于Selenga-Stanovoy超地体的东南部，由二佐伽布洛-二黄道长岩组成。结果表明，阿姆努纳克塔地块的年龄(240±1 Ma)与采自色伦加-维提姆火山-深部构造带东侧的奎屯组石英斑岩和聂尔楚干杂岩的碱性花岗岩年龄基本一致。综合考虑阿姆努纳克塔地块的地质位置和地球化学特征，有理由认为该地块的形成(以及奎屯组石英斑岩和聂尔楚干杂岩)与色伦加-维提姆带演化过程中的一次双峰型板内岩浆活动有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.