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首页> 外文期刊>Journal of geodynamics >Erosion-driven vertical motions of the circum Arctic: Comparative analysis of modern topography
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Erosion-driven vertical motions of the circum Arctic: Comparative analysis of modern topography

机译：北极圆环的侵蚀驱动垂直运动：现代地形的比较分析

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摘要

Deep and complex geodynamic processes, including the effects of plumes, heat, plate tectonics, and local tectonics control the Earth's surface. In the Arctic these deep processes are masked by extensive glaciations and associated or roughly synchronous erosion. In this study we aim to reveal these hidden geodynamic processes by modeling erosion backward in time by numerically restoring eroded material and calculating the flexural isostatic response repeatedly iteratively until eroded features are filled. This method estimates erosion recorded in the modern topography and models the influence of that erosion. Although the obvious topographic response to erosion is a lowering of the elevation, our coupled erosion-isostatic response method results in dramatic vertical motions leading to km-scale uplift in fjord carved areas of Scandinavia, Greenland, and Canadian Arctic Archipelago and supporting ancient orogenic belts of northern Siberia and northern Alaska to stay at high elevation. Sensitivity testing confirms the utility of our method over a range of effective elastic plate thicknesses as well as for laterally varying elastic thickness. Comparison of modelling results with observed gravity anomalies shows that our method is valid for both glacial and fluvial affected landscapes but more importantly links surface and deep Earth dynamics. Combined analysis of the gravity anomalies and model results also explains erosion as one of the main mechanisms responsible for gravity signal for tectonically inactive regions and illustrates the interaction of short wavelength erosional processes and large scale, regional processes like active orogenesis and dynamic topography.
机译：深层和复杂的地球动力学过程，包括羽流，热量，板块构造和局部构造的影响控制着地球的表面。在北极，这些深层过程被广泛的冰川以及相关的或大致同步的侵蚀所掩盖。在这项研究中，我们旨在通过对侵蚀材料进行数值恢复，并通过反复迭代计算挠曲等静压响应，直至填充侵蚀特征，及时对侵蚀进行建模，从而揭示这些隐藏的地球动力学过程。该方法估算了现代地形中记录的侵蚀并模拟了该侵蚀的影响。尽管对侵蚀的明显地形响应是海拔的降低，但我们耦合的等静力响应方法导致剧烈的垂直运动，导致斯堪的纳维亚半岛，格陵兰岛和加拿大北极群岛的峡湾雕刻区的千米规模隆升，并支持古代造山带西伯利亚北部和阿拉斯加北部保持高海拔。敏感性测试证实了我们的方法在一系列有效弹性板厚度以及横向变化的弹性厚度上的实用性。建模结果与观测到的重力异常的比较表明，我们的方法对于冰川和河流影响的景观均有效，但更重要的是将表面动力学和深部地球动力学联系在一起。对重力异常和模型结果的综合分析还解释了侵蚀是造成构造非活动区重力信号的主要机制之一，并说明了短波侵蚀过程与诸如活动造山运动和动态地形的大规模区域过程之间的相互作用。

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