Preprints
https://doi.org/10.5194/se-2021-90
https://doi.org/10.5194/se-2021-90

  03 Aug 2021

03 Aug 2021

Review status: this preprint is currently under review for the journal SE.

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

Roman Sidorov1, Mikhail Kaban1,2,3, Anatoly Soloviev1,3, Alexei Petrunin1,2,3, Alexei Gvishiani1,3, Alexei Oshchenko1, Anton Popov1, and Roman Krasnoperov1 Roman Sidorov et al.
  • 1Geophysical Center of the Russian Academy of Sciences (GC RAS), Moscow, Russia
  • 2German Research Center for Geosciences (GFZ), Potsdam, Germany
  • 3Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS), Moscow, Russia

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.

Roman Sidorov et al.

Status: open (until 25 Sep 2021)

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Roman Sidorov et al.

Roman Sidorov et al.

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Short summary
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 of thickness and density of sediments in the study area display Significant changes in the thickness and distribution of sedimentary rocks revealed for some particular basins. The new results improve our knowledge about the region, providing a better understanding of the evolution of the sedimentary basins.