Digital Models of the Deep Structure of the Earth’s Crust in the Eurasian Basin of the Arctic Ocean

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics Pub Date : 2023-12-01 DOI:10.1134/s0016852123070051

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Abstract—

Digital models of the deep structure of the Earth’s crust are developed based on the method of gravity modeling, taking the accumulated geophysical data on the Eurasian Basin of the Arctic Ocean into account. The digital models of the basement relief and sedimentary cover thickness in the Eurasian Basin are calculated on the basis of reinterpretation of depth multi-channel reflection seismic cross-sections and 2D gravity modeling. The digital models of the Moho surface relief and the thickness of the Earth’s crust are calculated using the improved 3D gravity modeling method. It is shown that the reason for the deepening of the basement in the Nansen Basin by 1–1.5 km in comparison with the Amundsen Basin is a larger volume of accumulated sedimentary cover in the Nansen Basin, with a similar crustal thickness of ~4.8 km in both basins. The characteristics of the oceanic crust studied on the basis of the obtained digital models reveal a complex 3D variability typical of ultraslow spreading ridges. In the region of the Gakkel Ridge, which was formed at full rates of spreading of less than 12 mm/year, the maximum spread of crustal thicknesses occurs and the tectonic factor dominates over the magmatic one during the accretion of the oceanic crust. This manifests itself in the formation of extended submarine ridges parallel to the amagmatic segments of the ridge.

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北冰洋欧亚盆地地壳深层结构数字模型

摘要- 根据重力建模方法，并考虑到积累的北冰洋欧亚盆地地球物理数据，建立了地壳深部结构数字模型。根据对深度多道反射地震断面的重新解释和二维重力建模，计算了欧亚盆地基底起伏和沉积覆盖层厚度的数字模型。利用改进的三维重力建模方法计算了莫霍面地表起伏和地壳厚度的数字模型。结果表明，南森盆地的基底比阿蒙森盆地加深了 1-1.5 千米，原因是南森盆地的沉积覆盖层累积量较大，而两个盆地的地壳厚度相近，均为约 4.8 千米。根据获得的数字模型研究的大洋地壳特征显示，超低扩张脊具有典型的复杂三维变化。在以小于 12 毫米/年的完全扩张速率形成的加克尔海脊区域，地壳厚度出现了最大程度的扩散，在大洋地壳的增生过程中，构造因素比岩浆因素占主导地位。这表现为与海脊的岩浆段平行的延伸海底海脊的形成。

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来源期刊

Geotectonics 地学-地球化学与地球物理

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.