Abstract

The article proposes a model of collisional and accretionary events of the Neoproterozoic at the western margin of the Siberian Craton based on the results of geological, petrological, and geochronological studies of Precambrian complexes of the Yenisei Ridge and comprehensive geophysical data. Mineralogical and petrological evidence of paleosubduction is presented, represented by relicts of glaucophane-bearing high-pressure mineral assemblages in metabasites (630‒620 Ma) within the tectonic mélange of the suture zone and by metamorphosed ophiolites and island arc complexes of the Isakovka and Predivinsk terranes (700–600 Ma) of the Sayan–Yenisei accretionary belt. The proposed geodynamic evolutionary model of the Yenisei paleosubduction zone includes reconstructions for time intervals of 740‒700, 640‒600, 580‒540 Ma, during which a suture zone was formed as a result of collision of the Kas–Turukhansk microcontinent with the Siberian Craton. Tectonized fragments of the suture partially outcrop on the surface on the right bank of the Yenisei River. The bulk of the deformed and metamorphosed oceanic crust is buried beneath the Ediacaran and Phanerozoic sedimentary cover in the eastern part of the Kas–Turukhansk microcontinent, which is traceable by geophysical data. The history of the region’s geological development in the Late Meso‒Neoproterozoic correlates with synchronous endogenic events along the Arctic margin of the Nuna and Rodinia paleocontinents, which confirms the spatial proximity of the Siberian and North Atlantic cratons (Laurentia and Baltica) in a wide time range.

中文翻译：

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俄罗斯叶尼塞古俯冲带（西伯利亚克拉通的西缘）新元古代演化的地球动力学模型

摘要

本文基于叶尼塞山脊前寒武纪复合体的地质，岩石学和地球年代学研究结果以及综合的地球物理数据，提出了一个西伯利亚克拉通西部边缘新元古代碰撞和增生事件的模型。提出了古俯冲的矿物学和岩石学证据，以缝合带构造混杂岩中变质岩中含玻葡烷的高压矿物组合（630‒620 Ma）的遗迹以及伊萨科夫卡和普列维申斯克的变质蛇绿岩和岛弧复合体为代表。 Sayan–Yenisei增生带的地形（700–600 Ma）。建议的叶尼塞古俯冲带地球动力学演化模型包括对740‒700、640‒600、580‒540 Ma，在此期间，由于Kas–Turukhansk微大陆与西伯利亚克拉通的碰撞而形成了缝合带。在叶尼塞河右岸的表层，缝合的缝线片段部分露出。大部分变形和变质的洋壳被埋藏在Kas–Turukhansk微大陆东部的Ediacaran和Phanerozoic沉积覆盖层之下，这可以通过地球物理数据来追踪。该地区晚中新新生代的地质发展历史与沿努纳和罗迪尼亚古大陆的北极边缘同步发生的内生事件有关，这证实了西伯利亚和北大西洋克拉通（Laurentia和Baltica）在很长一段时间内的空间接近性范围。