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. In the present study, the structure of sedimentary basins in the eastern AsiaArctic zone is analysed by employing the approach based on decompensativegravity anomalies. Two obtained models, differing in their initialconditions, provide thickness and density of sediments in the study area.They demonstrate essentially new details on the structure, shape, and densityof the sedimentary basins. Significant changes in the sedimentary thicknessand the depo-centre location have been found for the Anadyr Basin in itscontinental part. Also, new details on the sedimentary thicknessdistribution have been revealed for the central part of the Penzhin andPustorets basins; for the latter, the new location of the depo-centre hasbeen identified. The new model agrees well with the seismic data on thesedimentary thickness for the offshore part of the Chauna Basin confirmingthat the method is robust. The most significant lateral redistribution ofthe thickness has been found for the Lower Cretaceous coal-bearing strata inthe northern part of the Zyryanka Basin, where the connection of twocoal-bearing zones, which was not previously mapped, has been identified.Also, the new details on the sedimentary thickness distribution have beendiscovered for the Primorsk Basin. Therefore, the new results substantiallyimprove our knowledge about the region, since previous geological andgeophysical studies were unsystematic, sparse, and limited in depth. Thus,the implementation of the decompensative gravity anomalies approach providesa better understanding of the evolution of the sedimentary basins and theobtained results can be used for planning future detailed studies in thearea.

Sedimentary basins of the eastern Asia Arctic zone: new details on their structure revealed by decompensative gravity anomalies