Abstract. In the present study, the 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 depo-centre 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 depo-centre 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, which 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 future detailed studies in the
area.