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首页> 外文期刊>Journal of geodynamics >Crustal architecture of the East Siberian Arctic Shelf and adjacent Arctic Ocean constrained by seismic data and gravity modeling results
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Crustal architecture of the East Siberian Arctic Shelf and adjacent Arctic Ocean constrained by seismic data and gravity modeling results

机译：受地震数据和重力模拟结果约束，东西伯利亚北极大陆架和北冰洋的地壳结构

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摘要

The Eastern Siberian Arctic Shelf (ESAS) represents a geologically complex realm with a tectonic history that is related to the final stages of the formation of the Pangaea supercontinent during the Mesozoic and its subsequent disintegration during the Late Cretaceous and Cenozoic. It is a key region to constrain the origin of the deep water basins and intervening ridges of the Amerasia Basin. We present results of gravity modeling of published seismic refraction and reflection profiles acquired between 1989 and 2012 over the ESAS and adjacent Arctic Ocean along five composite geotransects using Getech's satellite altimeter-derived gravity data. Our main goal was to examine published crustal models and to present new models for the ESAS that are constrained by both seismic data and 2D gravity forward modeling. We consider several topics important for understanding Arctic geology: (i) hyperextension within the Laptev Rift System and the possible extent of the exhumed mantle, (ii) the relationship between the New Siberian Shelf and the Lomonosov Ridge, (iii) the nature of the collapsed upper Mesozoic fold belt in the southern part of the East Siberian Sea, (iv) the character of transition between the De Long Massif and the deep-water Podvodnikov Basin, (v) the lateral extent of the hyperextended North Chukchi Basin and the nature of its basement, and (vi) relationship between the Mendeleev Ridge and Chukchi Plateau crustal domains. Our results do not confirm the previously inferred extent of continental crust beneath the oceanic realm. The latter is dominated by High Arctic Large Igneous Province (HALM) igneous crust. We discuss the existence of a dismembered continental Bennett-Barrovia block that is currently represented by three smaller fragments/massifs. When restored to its possible single state, this block can play a crucial role in reconstructing the pre-Canada Basin Arctic.
机译：西伯利亚东部大陆架（ESAS）代表具有构造历史的地质复杂领域，与中生代Pangea超大陆形成的最后阶段以及白垩纪晚期和新生代随后的解体有关。这是限制深水盆地和中间美洲洋盆山脊起源的关键地区。我们使用Getech的卫星高度计得出的重力数据，介绍了1989年至2012年之间在ESAS和相邻的北冰洋沿五个复合地质样线采集的已发布地震折射和反射剖面的重力模型的结果。我们的主要目标是检查已发布的地壳模型，并提出受地震数据和二维重力正向建模约束的ESAS新模型。我们认为对理解北极地质很重要的几个主题：（i）拉普捷夫裂谷系统内的过度扩张和挖掘出的地幔的可能范围，（ii）新西伯利亚大陆架和罗蒙诺索夫海岭之间的关系，（iii）北极的性质东西伯利亚海南部的上中生代褶皱带塌陷，（iv）德隆地块与深水Podvodnikov盆地之间的过渡特征，（v）超扩展的北楚科奇盆地的横向范围和自然界地下室，以及（vi）门捷列夫岭和楚科奇高原地壳区域之间的关系。我们的结果并未证实以前推断的海洋界之下的大陆壳范围。后者由高北极大火成岩省（HALM）火成地壳控制。我们讨论了一个被肢解的贝内特-巴罗维亚大陆块的存在，该块目前由三个较小的碎片/质块表示。当恢复到其可能的单一状态时，该区块可以在重建加拿大前盆地北极方面发挥关键作用。

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