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Sedimentary basins of the Eastern Asia Arctic zone: new details on their structure revealed by decompensative gravity anomalies
Solid Earth ( IF 3.4 ) Pub Date : 2021-08-03 , DOI: 10.5194/se-2021-90
Roman Sidorov , Mikhail Kaban , Anatoly Soloviev , Alexei Petrunin , Alexei Gvishiani , Alexei Oshchenko , Anton Popov , Roman Krasnoperov

Abstract. In the present study, structure of sedimentary basins in the Eastern Asia Arctic zone is analysed by employing the approach based on decompensative gravity anomalies. Two obtained models, differing in their initial conditions, provide thickness and density of sediments in the study area. They demonstrate essentially new details on the structure, shape and density of the sedimentary basins. Significant changes in the sedimentary thickness and the depocenter location have been found for the Anadyr basin in its continental part. Also, new details on the sedimentary thickness distribution have been revealed for the central part of the Penzhin and Pustorets basins, for the latter, the new location of the depocenter has been identified. The new model agrees well with the seismic data on the sedimentary thickness for the offshore part of the Chauna basin confirming that the method is robust. The most significant lateral redistribution of the thickness has been found for the Lower Cretaceous coal-bearing strata in the northern part of the Zyryanka basin, where the connection of two coal-bearing zones, that was not previously mapped, has been identified. Also, the new details on the sedimentary thickness distribution have been discovered for the Primorsk basin. Therefore, the new results substantially improve our knowledge about the region, since previous geological and geophysical studies were unsystematic, sparse and limited in depth. Thus, the implementation of the decompensative gravity anomalies approach provides a better understanding of the evolution of the sedimentary basins and the obtained results can be used for planning of future detailed studies in the area.

中文翻译:

东亚北极地区的沉积盆地:失代偿重力异常揭示其结构的新细节

摘要。本研究采用基于失代偿重力异常的方法分析东亚北极地区沉积盆地的结构。两个获得的模型,其初始条件不同,提供了研究区沉积物的厚度和密度。它们展示了沉积盆地结构、形状和密度的新细节。已发现阿纳德尔盆地大陆部分的沉积厚度和沉积中心位置发生了显着变化。此外,还揭示了 Penzhin 和 Pustorets 盆地中部的沉积厚度分布的新细节,对于后者,已经确定了沉积中心的新位置。新模型与 Chauna 盆地近海部分沉积厚度的地震数据非常吻合,证实该方法是稳健的。在 Zyryanka 盆地北部的下白垩统含煤地层中发现了厚度的最显着的横向重新分布,在那里已经确定了两个以前没有绘制过的含煤带的连接。此外,还发现了 Primorsk 盆地沉积厚度分布的新细节。因此,新的结果大大提高了我们对该地区的了解,因为以前的地质和地球物理研究不系统、稀疏且深度有限。因此,
更新日期:2021-08-03
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