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    • Keywords


      Polygonal impact craters; Margaritifer Terra; wrinkle ridge; graben; lobate scarps.

    • Abstract


      The presence of polygonal-shaped craters, i.e., craters with complete or incomplete polygonal rims along with circular or elliptical outlines, on the surface of celestial bodies has been known for nearly a century. However, many investigations on their distribution and formation have not been carried out, until recently. Scientists have proposed that the polygonal shapes of the crater rims owe their origin to the preexisting structurally weak planes like faults/fractures in the area adjacent to the impact. The present study area is the southern part of Margaritifer Terra, Mars; a mid-Noachian terrain, which has craters of different morphologies, including the polygonal impact craters (PICs). The study focuses on the reason for the development of PICs by identification and mapping of a population of 50 selected polygonal craters along with morphotectonic features namely grabens, wrinkle ridges, and lobate scarps. The analysis of orientations of the straight segments of polygonal crater rims shows marked resemblance with orientations of these morphotectonic features conforming to their control on the rim geometries.


      ${\bullet}$ Structural mapping of the southern Margaritifer Terra region, Mars.

      ${\bullet}$ Generating rose diagrams and line graphs for the orientation of the straight edges of polygonal craters and the morphotectonic features within the southern Margaritifer Terra region.

      ${\bullet}$ Conducting statistical F-test to find out the bearing of weak planes on the formation of PICs.

      ${\bullet}$ Finding out the presence of buried weak planes by comparing the rose diagrams and spike graphs.

    • Author Affiliations



      1. Asutosh College, 92, Shyama Prasad Mukherjee Road, Kolkata, India.
      2. Presidency University, 86/1, College Street, Kolkata, India.
      3. Space Applications Centre, Jodhpur Tekra, Ambawadi Vistar P.O., Ahmedabad, India.
    • Dates

    • Supplementary Material

  • Journal of Earth System Science | News

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