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首页> 外文期刊>Journal of geodynamics >Basement segmentation and tectonic structure of the Lomonosov Ridge, arctic Ocean: Insights from bedrock geochronology
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Basement segmentation and tectonic structure of the Lomonosov Ridge, arctic Ocean: Insights from bedrock geochronology

机译：北极海洋，北极海洋地下室的地下分割和构造结构：基岩地质学中的见解

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Apparent variations in the morphology of the Lomonosov Ridge and its along-strike segmentation are caused by the heterogeneity of the basement. Based on the morphological diversity, we divide the Lomonosov Ridge into three segments: Siberian, Central and North American. New petrographic and geochronological data from the rock clasts sampled in the "Arctika-2007-1" expedition, are integrated with seismic and relevant mineralogical, petrographic and isotopic data. Recovered fragments of the high-grade metamorphic and siliciclastic rocks are attributed to the bedrock of the Siberian and Central Segments of the Lomonosov Ridge respectively.The mineralogical and isotopic analysis of detrital zircons from Neoproterozoic arkose defines the Grenvillian age for the basement of the Siberian Segment of the Lomonosov Ridge. The U-Pb dating of the metamorphic zircons from gneisses and schists suggests that Timanian crystalline basement of the Central Segment was affected by an upper-Ordivician (similar to 450 Ma) felsic magmatism, followed by the mid- to high-grade Caledonian tectonometamorphic event (similar to 400 Ma). The Central Segment is therefore inferred to be a frontal part of Caledonian convergent shear and fold zone.Caledonian deformation front is suggested between the northeastern and southwestern islands of De Long archipelago. Northward from the shelf break, the orogenic front is expected between the Geophysicists Spur and the main horst of the Siberian Segment. Within the Central Segment the Caledonian deformation front is inferred to stretch along the western flank of the Lomonosov Ridge.
机译：Lomonosov脊的形态的表观变化及其沿着击球分割是由地下缘的异质性引起的。基于形态多样性，我们将Lomonosov Ridge分为三个部分：西伯利亚，中美洲和北美。来自“Arctika-2007-1”探险中采样的岩石泥炭的新岩体和地理学数据，与地震和相关矿物学，岩体和同位素数据相结合。高档变质和硅质岩石的回收碎片分别归因于Lomonosov山脊的西伯利亚和中心区段。来自Neoproterozoic arkose的碎屑锆石的矿物学和同位素分析定义了西伯利亚地下室的Grenvillian年龄Lomonosov山脊。来自片状和分类的变质氧化锆的U-PB约会表明，中央部门的蒂纳尼亚晶体地下室受到上一个定型人（类似于450 mA）的猫猫魔法，其次是中高级喀里多尼人的部门事件（类似于400 mA）。因此，中央段被推断为Caledonian会聚剪切和折叠区的正面部分。东北部和西南部的De Long Archipelago的岛屿之间建议了持续变形前面。从架子休息向北，地球物理学家之间的敌人前线预计将在地球物学家刺激和西伯利亚段的主要霍斯斯特之间。在中心段内，沿着拉莫索洛夫山脊的西部侧翼推断出喀里多尼亚变形前沿。

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