THE PHENOMENON OF RAPID ACCUMULATION OF SEDIMENTS BELONGING TO THE UDOKAN GROUP AND THE FORMATION OF THE UNIQUE UDOKAN COPPER DEPOSIT (ALDAN SHIELD, SIBERIAN CRATON)

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2020-12-14 DOI:10.5800/gt-2020-11-4-0498

D. Gladkochub, A. Mazukabzov, T. Donskaya

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引用次数: 3

Abstract

We analyzed new geological and geochronological data on sedimentation and metamorphism in the junction area of the Aldan and Stanovoy Superterranes comprising the southern flank of the Siberian craton. The analysis was focused on early Proterozoic deposits belonging to the Udokan group. It is confirmed that highly metamorphosed rocks at the base of the Udokan group (Kolar subgroup of the Stanovoy suture zone) differ sharply from other rock associations included in this group (Chiney and Kemen subgroups of the Aldan Superterrane). They differ in the degree of metamorphic alterations, style of tectonic deformation, igneous complexes intruding them, and show a complete lack of copper mineralization. There are thus grounds to exclude the Kolar subgroup from the Udokan group. According to our data, the age of the sediments in the Udokan group, including the Chiney and Kemen subgroups, is 1.90‒1.87 Ga, i.e. in the study area, sedimentation lasted for no more than 30 Ma and proceeded simultaneously with the copper mineralization within the intracontinental extensional basin at the stage of collapse of the early Proterozoic orogen.

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乌多坎群沉积物快速堆积现象及独特乌多坎铜矿床(西伯利亚克拉通阿尔旦盾)的形成

我们分析了西伯利亚克拉通南翼Aldan和Stanovoy超地体交界处沉积和变质作用的新地质和年代学资料。重点分析了属于乌多坎群的早元古代沉积。证实了乌多坎群(Stanovoy缝合带的Kolar亚群)底部的高度变质岩与该群中其他岩石组合(Aldan超级地体的Chiney和Kemen亚群)存在明显差异。它们在变质蚀变程度、构造变形样式、侵入的火成岩杂岩等方面存在差异，并显示出完全缺乏铜矿化作用。因此，有理由将Kolar亚群排除在Udokan群之外。根据我们的资料，乌多坎群(包括Chiney亚群和可门亚群)的沉积年龄为1.90 ~ 1.87 Ga，即研究区沉积时间不超过30 Ma，与早元古代造山带崩塌阶段陆内伸展盆地内的铜矿化同时进行。

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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.